C#工具:Ado.Net SqlServer数据库 MySql数据库

数据库连接字符串(web.config来配置)，可以动态更改connectionstring支持多数据库.

sqlserver调用数据库

using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.threading.tasks;
using system.configuration;
using system.data;
using system.data.sqlclient;

namespace dal
{
    public static class dbhelper
    {
        public static string strcon = "data source=.;initial catalog=week3;integrated security=true";
        /// <summary>
        /// 增删改
        /// </summary>
        /// <param name="sql">sql语句</param>
        /// <param name="str">连接字符串</param>
        /// <returns></returns>
        public static int executenonquery(string sql)
        {
            //实例化连接对象
            sqlconnection conn = new sqlconnection(strcon);
            int result = 0;
            try
            {
                conn.open();
                //实例化命令对象
                sqlcommand cmd = new sqlcommand(sql, conn);
                //执行命令
                result = cmd.executenonquery();
            }
            catch (exception)
            {

                throw;
            }
            finally
            {
                conn.close();
            }
            return result;
        }
        /// <summary>
        /// 获取表格
        /// </summary>
        /// <param name="sql">sql语句</param>
        /// <param name="str">连接字符串</param>
        /// <returns></returns>
        public static datatable getdatatable(string sql)
        {
            //实例化连接对象
            sqlconnection conn = new sqlconnection(strcon);
            datatable dt = new datatable();

            try
            {
                //实例化适配器
                sqldataadapter sda = new sqldataadapter(sql, conn);
                sda.fill(dt);

            }
            catch (exception)
            {

                throw;
            }
            return dt;
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sql">sql语句</param>
        /// <param name="str">连接字符串</param>
        /// <returns></returns>
        public static sqldatareader getdatareader(string sql)
        {
            //实例化连接对象
            sqlconnection conn = new sqlconnection(strcon);
            sqldatareader sdr;
            try
            {
                conn.open();
                //实例化命令对象
                sqlcommand cmd = new sqlcommand(sql, conn);
                sdr = cmd.executereader();

            }
            catch (exception)
            {

                throw;
            }
            return sdr;
        }
        /// <summary>
        /// 返回单行单列
        /// </summary>
        /// <param name="sql">sql语句</param>
        /// <param name="str">连接字符串</param>
        /// <returns></returns>
        public static int executescalar(string sql)
        {
            //实例化连接对象
            sqlconnection conn = new sqlconnection(strcon);
            int result = 0;
            try
            {
                conn.open();
                //实例化命令对象
                sqlcommand cmd = new sqlcommand(sql, conn);
                result = convert.toint32(cmd.executescalar());
            }
            catch (exception)
            {

                throw;
            }
            finally
            {

                conn.close();
            }
            return result;
        }



        /// <summary>
        /// 信息分页显示
        /// </summary>
        /// <returns></returns>
        public static datatable getinfobypage(int pageindex, int pagesize)
        {
            string sql = string.format(@"select top {0}* from(
                    select xinxi.*,row_number() over(order by xinxi.xinxiid) pid ,type.name from type 
                    inner join xinxi on type.id= xinxi.typeid ) as temp 
                    where temp.pid>{1}", pagesize, (pageindex - 1) * pagesize);
            return dbhelper.getdatatable(sql);
        }
        /// <summary>
        /// 获取个数
        /// </summary>
        /// <returns></returns>
        public static int getcount()
        {
            string sql = "select count(xinxi.xinxiid) from type   inner join xinxi on type.id= xinxi.typeid";
            return dbhelper.executescalar(sql);

        }
    }
}

sqlserver-dbhelper

sqlserver调用数据库存储过程

using system;
using system.collections.generic;
using system.data;
using system.data.sqlclient;
using system.linq;
using system.web;

namespace unit07_service
{
    public class dbhelper
    {

        public static string connstr = "data source=.;initial catalog=db_news;integrated security=true";
        public static sqlconnection cnn = new sqlconnection(connstr);

        /// <summary>
        /// 执行增删改的操作
        /// </summary>
        /// <param name="sql">sql命令</param>
        /// <returns>受影响的行数</returns>
        public static int executenonquery(string sql)
        {
            open();
            sqlcommand command = new sqlcommand(sql, cnn);
            int result = command.executenonquery();
            cnn.close();
            return result;
        }
        /// <summary>
        /// 查询单个值
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static object executescalar(string sql)
        {
            open();
            sqlcommand command = new sqlcommand(sql, cnn);
            object result = command.executescalar();
            cnn.close();
            return result;
        }
        /// <summary>
        /// 返回数据表
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static datatable getdatatable(string sql)
        {
            sqldataadapter adapter = new sqldataadapter(sql, cnn);
            dataset ds = new dataset();
            adapter.fill(ds);
            return ds.tables[0];
        }
        /// <summary>
        /// 返回datareader对象，使用结束后，勿忘关闭datareader与数据库
        /// </summary>
        /// <param name="sql"></param>
        /// <returns></returns>
        public static sqldatareader getdatareader(string sql)
        {
            open();
            sqlcommand command = new sqlcommand(sql, cnn);
            return command.executereader();
        }
        /// <summary>
        /// 打开数据库
        /// </summary>
        public static void open()
        {
            if (cnn.state == connectionstate.broken || cnn.state == connectionstate.open)
            {
                cnn.close();
            }
            cnn.open();
        }

        /// <summary>
        /// 打开数据库
        /// </summary>
        public static void close()
        {
            cnn.close();
        }

        /// <summary>
        /// 使用存储过程查询数据结果
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="paras"></param>
        /// <returns></returns>
        public static datatable getdatatable(string procname, sqlparameter[] paras = null)
        {
            open();
            sqlcommand command = new sqlcommand(procname, cnn);
            command.commandtype = commandtype.storedprocedure;

            if (paras != null)
            {
                command.parameters.addrange(paras);
            }
            sqldataadapter adapter = new sqldataadapter(command);
            dataset ds = new dataset();
            adapter.fill(ds);
            close();
            return ds.tables[0];
        }

        /// <summary>
        /// 使用存储过程执行增删改
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="paras"></param>
        /// <returns></returns>
        public static int executenonquery(string procname, sqlparameter[] paras)
        {
            open();
            sqlcommand command = new sqlcommand(procname, cnn);
            command.commandtype = commandtype.storedprocedure;
            command.parameters.addrange(paras);

            int result = command.executenonquery();
            close();

            return result;


        }
    }
}

sqlserver-dbhelperproc

mysql调用数据库

using system;
using system.collections;
using system.collections.specialized;
using system.data;
using mysql.data.mysqlclient;
using system.configuration;
using system.data.common;
using system.collections.generic;
namespace student_api.controllers
{
    /// <summary>
    /// 数据访问抽象基础类
    /// copyright (c) 2004-2008 by litianping 
    /// </summary>
    public abstract class dbhelpermysql
    {
        //数据库连接字符串(web.config来配置)，可以动态更改connectionstring支持多数据库.        
        public static string connectionstring = "server=127.0.0.1;user id=root;pwd=root;database=06a_exam";
        public dbhelpermysql()
        {            
        }

        #region 公用方法
        /// <summary>
        /// 得到最大值
        /// </summary>
        /// <param name="fieldname"></param>
        /// <param name="tablename"></param>
        /// <returns></returns>
        public static int getmaxid(string fieldname, string tablename)
        {
            string strsql = "select max(" + fieldname + ")+1 from " + tablename;
            object obj = getsingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.parse(obj.tostring());
            }
        }
        /// <summary>
        /// 是否存在
        /// </summary>
        /// <param name="strsql"></param>
        /// <returns></returns>
        public static bool exists(string strsql)
        {
            object obj = getsingle(strsql);
            int cmdresult;
            if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.parse(obj.tostring());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }    
        /// <summary>
        /// 是否存在（基于mysqlparameter）
        /// </summary>
        /// <param name="strsql"></param>
        /// <param name="cmdparms"></param>
        /// <returns></returns>
        public static bool exists(string strsql, params mysqlparameter[] cmdparms)
        {
            object obj = getsingle(strsql, cmdparms);
            int cmdresult;
            if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.parse(obj.tostring());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        #endregion

        #region  执行简单sql语句

        /// <summary>
        /// 执行sql语句，返回影响的记录数
        /// </summary>
        /// <param name="sqlstring">sql语句</param>
        /// <returns>影响的记录数</returns>
        public static int executesql(string sqlstring)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand(sqlstring, connection))
                {
                    try
                    {
                        connection.open();
                        int rows = cmd.executenonquery();
                        return rows;
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        connection.close();
                        throw e;
                    }
                }
            }
        }

        public static int executesqlbytime(string sqlstring, int times)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand(sqlstring, connection))
                {
                    try
                    {
                        connection.open();
                        cmd.commandtimeout = times;
                        int rows = cmd.executenonquery();
                        return rows;
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        connection.close();
                        throw e;
                    }
                }
            }
        }
      
      
        /// <summary>
        /// 执行多条sql语句，实现数据库事务。
        /// </summary>
        /// <param name="sqlstringlist">多条sql语句</param>        
        public static int executesqltran(list<string> sqlstringlist)
        {
            using (mysqlconnection conn = new mysqlconnection(connectionstring))
            {
                conn.open();
                mysqlcommand cmd = new mysqlcommand();
                cmd.connection = conn;
                mysqltransaction tx = conn.begintransaction();
                cmd.transaction = tx;
                try
                {
                    int count = 0;
                    for (int n = 0; n < sqlstringlist.count; n++)
                    {
                        string strsql = sqlstringlist[n];
                        if (strsql.trim().length > 1)
                        {
                            cmd.commandtext = strsql;
                            count += cmd.executenonquery();
                        }
                    }
                    tx.commit();
                    return count;
                }
                catch
                {
                    tx.rollback();
                    return 0;
                }
            }
        }
        /// <summary>
        /// 执行带一个存储过程参数的的sql语句。
        /// </summary>
        /// <param name="sqlstring">sql语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static int executesql(string sqlstring, string content)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                mysqlcommand cmd = new mysqlcommand(sqlstring, connection);
                mysql.data.mysqlclient.mysqlparameter myparameter = new mysql.data.mysqlclient.mysqlparameter("@content", sqldbtype.ntext);
                myparameter.value = content;
                cmd.parameters.add(myparameter);
                try
                {
                    connection.open();
                    int rows = cmd.executenonquery();
                    return rows;
                }
                catch (mysql.data.mysqlclient.mysqlexception e)
                {
                    throw e;
                }
                finally
                {
                    cmd.dispose();
                    connection.close();
                }
            }
        }
        /// <summary>
        /// 执行带一个存储过程参数的的sql语句。
        /// </summary>
        /// <param name="sqlstring">sql语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static object executesqlget(string sqlstring, string content)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                mysqlcommand cmd = new mysqlcommand(sqlstring, connection);
                mysql.data.mysqlclient.mysqlparameter myparameter = new mysql.data.mysqlclient.mysqlparameter("@content", sqldbtype.ntext);
                myparameter.value = content;
                cmd.parameters.add(myparameter);
                try
                {
                    connection.open();
                    object obj = cmd.executescalar();
                    if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (mysql.data.mysqlclient.mysqlexception e)
                {
                    throw e;
                }
                finally
                {
                    cmd.dispose();
                    connection.close();
                }
            }
        }
        /// <summary>
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
        /// </summary>
        /// <param name="strsql">sql语句</param>
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
        /// <returns>影响的记录数</returns>
        public static int executesqlinsertimg(string strsql, byte[] fs)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                mysqlcommand cmd = new mysqlcommand(strsql, connection);
                mysql.data.mysqlclient.mysqlparameter myparameter = new mysql.data.mysqlclient.mysqlparameter("@fs", sqldbtype.image);
                myparameter.value = fs;
                cmd.parameters.add(myparameter);
                try
                {
                    connection.open();
                    int rows = cmd.executenonquery();
                    return rows;
                }
                catch (mysql.data.mysqlclient.mysqlexception e)
                {
                    throw e;
                }
                finally
                {
                    cmd.dispose();
                    connection.close();
                }
            }
        }

        /// <summary>
        /// 执行一条计算查询结果语句，返回查询结果（object）。
        /// </summary>
        /// <param name="sqlstring">计算查询结果语句</param>
        /// <returns>查询结果（object）</returns>
        public static object getsingle(string sqlstring)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand(sqlstring, connection))
                {
                    try
                    {
                        connection.open();
                        object obj = cmd.executescalar();
                        if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        connection.close();
                        throw e;
                    }
                }
            }
        }
        public static object getsingle(string sqlstring, int times)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand(sqlstring, connection))
                {
                    try
                    {
                        connection.open();
                        cmd.commandtimeout = times;
                        object obj = cmd.executescalar();
                        if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        connection.close();
                        throw e;
                    }
                }
            }
        }
        /// <summary>
        /// 执行查询语句，返回mysqldatareader ( 注意：调用该方法后，一定要对mysqldatareader进行close )
        /// </summary>
        /// <param name="strsql">查询语句</param>
        /// <returns>mysqldatareader</returns>
        public static mysqldatareader executereader(string strsql)
        {
            mysqlconnection connection = new mysqlconnection(connectionstring);
            mysqlcommand cmd = new mysqlcommand(strsql, connection);
            try
            {
                connection.open();
                mysqldatareader myreader = cmd.executereader(commandbehavior.closeconnection);
                return myreader;
            }
            catch (mysql.data.mysqlclient.mysqlexception e)
            {
                throw e;
            }   

        }
        /// <summary>
        /// 执行查询语句，返回dataset
        /// </summary>
        /// <param name="sqlstring">查询语句</param>
        /// <returns>dataset</returns>
        public static dataset query(string sqlstring)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                dataset ds = new dataset();
                try
                {
                    connection.open();
                    mysqldataadapter command = new mysqldataadapter(sqlstring, connection);
                    command.fill(ds, "ds");
                }
                catch (mysql.data.mysqlclient.mysqlexception ex)
                {
                    throw new exception(ex.message);
                }
                return ds;
            }
        }
        public static dataset query(string sqlstring, int times)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                dataset ds = new dataset();
                try
                {
                    connection.open();
                    mysqldataadapter command = new mysqldataadapter(sqlstring, connection);
                    command.selectcommand.commandtimeout = times;
                    command.fill(ds, "ds");
                }
                catch (mysql.data.mysqlclient.mysqlexception ex)
                {
                    throw new exception(ex.message);
                }
                return ds;
            }
        }



        #endregion

        #region 执行带参数的sql语句

        /// <summary>
        /// 执行sql语句，返回影响的记录数
        /// </summary>
        /// <param name="sqlstring">sql语句</param>
        /// <returns>影响的记录数</returns>
        public static int executesql(string sqlstring, params mysqlparameter[] cmdparms)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand())
                {
                    try
                    {
                        preparecommand(cmd, connection, null, sqlstring, cmdparms);
                        int rows = cmd.executenonquery();
                        cmd.parameters.clear();
                        return rows;
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        throw e;
                    }
                }
            }
        }


        /// <summary>
        /// 执行多条sql语句，实现数据库事务。
        /// </summary>
        /// <param name="sqlstringlist">sql语句的哈希表（key为sql语句，value是该语句的mysqlparameter[]）</param>
        public static void executesqltran(hashtable sqlstringlist)
        {
            using (mysqlconnection conn = new mysqlconnection(connectionstring))
            {
                conn.open();
                using (mysqltransaction trans = conn.begintransaction())
                {
                    mysqlcommand cmd = new mysqlcommand();
                    try
                    {
                        //循环
                        foreach (dictionaryentry myde in sqlstringlist)
                        {
                            string cmdtext = myde.key.tostring();
                            mysqlparameter[] cmdparms = (mysqlparameter[])myde.value;
                            preparecommand(cmd, conn, trans, cmdtext, cmdparms);
                            int val = cmd.executenonquery();
                            cmd.parameters.clear();
                        }
                        trans.commit();
                    }
                    catch
                    {
                        trans.rollback();
                        throw;
                    }
                }
            }
        }
       
    
        /// <summary>
        /// 执行多条sql语句，实现数据库事务。
        /// </summary>
        /// <param name="sqlstringlist">sql语句的哈希表（key为sql语句，value是该语句的mysqlparameter[]）</param>
        public static void executesqltranwithindentity(hashtable sqlstringlist)
        {
            using (mysqlconnection conn = new mysqlconnection(connectionstring))
            {
                conn.open();
                using (mysqltransaction trans = conn.begintransaction())
                {
                    mysqlcommand cmd = new mysqlcommand();
                    try
                    {
                        int indentity = 0;
                        //循环
                        foreach (dictionaryentry myde in sqlstringlist)
                        {
                            string cmdtext = myde.key.tostring();
                            mysqlparameter[] cmdparms = (mysqlparameter[])myde.value;
                            foreach (mysqlparameter q in cmdparms)
                            {
                                if (q.direction == parameterdirection.inputoutput)
                                {
                                    q.value = indentity;
                                }
                            }
                            preparecommand(cmd, conn, trans, cmdtext, cmdparms);
                            int val = cmd.executenonquery();
                            foreach (mysqlparameter q in cmdparms)
                            {
                                if (q.direction == parameterdirection.output)
                                {
                                    indentity = convert.toint32(q.value);
                                }
                            }
                            cmd.parameters.clear();
                        }
                        trans.commit();
                    }
                    catch
                    {
                        trans.rollback();
                        throw;
                    }
                }
            }
        }
        /// <summary>
        /// 执行一条计算查询结果语句，返回查询结果（object）。
        /// </summary>
        /// <param name="sqlstring">计算查询结果语句</param>
        /// <returns>查询结果（object）</returns>
        public static object getsingle(string sqlstring, params mysqlparameter[] cmdparms)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand())
                {
                    try
                    {
                        preparecommand(cmd, connection, null, sqlstring, cmdparms);
                        object obj = cmd.executescalar();
                        cmd.parameters.clear();
                        if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        /// 执行查询语句，返回mysqldatareader ( 注意：调用该方法后，一定要对mysqldatareader进行close )
        /// </summary>
        /// <param name="strsql">查询语句</param>
        /// <returns>mysqldatareader</returns>
        public static mysqldatareader executereader(string sqlstring, params mysqlparameter[] cmdparms)
        {
            mysqlconnection connection = new mysqlconnection(connectionstring);
            mysqlcommand cmd = new mysqlcommand();
            try
            {
                preparecommand(cmd, connection, null, sqlstring, cmdparms);
                mysqldatareader myreader = cmd.executereader(commandbehavior.closeconnection);
                cmd.parameters.clear();
                return myreader;
            }
            catch (mysql.data.mysqlclient.mysqlexception e)
            {
                throw e;
            }
            //            finally
            //            {
            //                cmd.dispose();
            //                connection.close();
            //            }    

        }

        /// <summary>
        /// 执行查询语句，返回dataset
        /// </summary>
        /// <param name="sqlstring">查询语句</param>
        /// <returns>dataset</returns>
        public static dataset query(string sqlstring, params mysqlparameter[] cmdparms)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                mysqlcommand cmd = new mysqlcommand();
                preparecommand(cmd, connection, null, sqlstring, cmdparms);
                using (mysqldataadapter da = new mysqldataadapter(cmd))
                {
                    dataset ds = new dataset();
                    try
                    {
                        da.fill(ds, "ds");
                        cmd.parameters.clear();
                    }
                    catch (mysql.data.mysqlclient.mysqlexception ex)
                    {
                        throw new exception(ex.message);
                    }
                    return ds;
                }
            }
        }


        private static void preparecommand(mysqlcommand cmd, mysqlconnection conn, mysqltransaction trans, string cmdtext, mysqlparameter[] cmdparms)
        {
            if (conn.state != connectionstate.open)
                conn.open();
            cmd.connection = conn;
            cmd.commandtext = cmdtext;
            if (trans != null)
                cmd.transaction = trans;
            cmd.commandtype = commandtype.text;//cmdtype;
            if (cmdparms != null)
            {


                foreach (mysqlparameter parameter in cmdparms)
                {
                    if ((parameter.direction == parameterdirection.inputoutput || parameter.direction == parameterdirection.input) &&
                        (parameter.value == null))
                    {
                        parameter.value = dbnull.value;
                    }
                    cmd.parameters.add(parameter);
                }
            }
        }

        #endregion

        

    }

}

mysql-dbhelper

mysql调用数据库存储过程

using system;
using system.collections;
using system.collections.specialized;
using system.data;
using mysql.data.mysqlclient;
using system.configuration;
using system.data.common;
using system.collections.generic;
namespace student_client
{
    /// <summary>
    /// 数据访问抽象基础类
    /// copyright (c) 2004-2008 by litianping 
    /// </summary>
    public abstract class dbhelpermysql
    {
        //数据库连接字符串(web.config来配置)，可以动态更改connectionstring支持多数据库.        
        public static string connectionstring = "server=127.0.0.1;user id=root;pwd=root;database=06a_exam";
        public dbhelpermysql()
        {            
        }

        #region 公用方法
        /// <summary>
        /// 得到最大值
        /// </summary>
        /// <param name="fieldname"></param>
        /// <param name="tablename"></param>
        /// <returns></returns>
        public static int getmaxid(string fieldname, string tablename)
        {
            string strsql = "select max(" + fieldname + ")+1 from " + tablename;
            object obj = getsingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.parse(obj.tostring());
            }
        }
        /// <summary>
        /// 是否存在
        /// </summary>
        /// <param name="strsql"></param>
        /// <returns></returns>
        public static bool exists(string strsql)
        {
            object obj = getsingle(strsql);
            int cmdresult;
            if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.parse(obj.tostring());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }    
        /// <summary>
        /// 是否存在（基于mysqlparameter）
        /// </summary>
        /// <param name="strsql"></param>
        /// <param name="cmdparms"></param>
        /// <returns></returns>
        public static bool exists(string strsql, params mysqlparameter[] cmdparms)
        {
            object obj = getsingle(strsql, cmdparms);
            int cmdresult;
            if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.parse(obj.tostring());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        #endregion

        #region  执行简单sql语句

        /// <summary>
        /// 执行sql语句，返回影响的记录数
        /// </summary>
        /// <param name="sqlstring">sql语句</param>
        /// <returns>影响的记录数</returns>
        public static int executesql(string sqlstring)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand(sqlstring, connection))
                {
                    try
                    {
                        connection.open();
                        int rows = cmd.executenonquery();
                        return rows;
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        connection.close();
                        throw e;
                    }
                }
            }
        }

        public static int executesqlbytime(string sqlstring, int times)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand(sqlstring, connection))
                {
                    try
                    {
                        connection.open();
                        cmd.commandtimeout = times;
                        int rows = cmd.executenonquery();
                        return rows;
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        connection.close();
                        throw e;
                    }
                }
            }
        }
      
      
        /// <summary>
        /// 执行多条sql语句，实现数据库事务。
        /// </summary>
        /// <param name="sqlstringlist">多条sql语句</param>        
        public static int executesqltran(list<string> sqlstringlist)
        {
            using (mysqlconnection conn = new mysqlconnection(connectionstring))
            {
                conn.open();
                mysqlcommand cmd = new mysqlcommand();
                cmd.connection = conn;
                mysqltransaction tx = conn.begintransaction();
                cmd.transaction = tx;
                try
                {
                    int count = 0;
                    for (int n = 0; n < sqlstringlist.count; n++)
                    {
                        string strsql = sqlstringlist[n];
                        if (strsql.trim().length > 1)
                        {
                            cmd.commandtext = strsql;
                            count += cmd.executenonquery();
                        }
                    }
                    tx.commit();
                    return count;
                }
                catch
                {
                    tx.rollback();
                    return 0;
                }
            }
        }
        /// <summary>
        /// 执行带一个存储过程参数的的sql语句。
        /// </summary>
        /// <param name="sqlstring">sql语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static int executesql(string sqlstring, string content)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                mysqlcommand cmd = new mysqlcommand(sqlstring, connection);
                mysql.data.mysqlclient.mysqlparameter myparameter = new mysql.data.mysqlclient.mysqlparameter("@content", sqldbtype.ntext);
                myparameter.value = content;
                cmd.parameters.add(myparameter);
                try
                {
                    connection.open();
                    int rows = cmd.executenonquery();
                    return rows;
                }
                catch (mysql.data.mysqlclient.mysqlexception e)
                {
                    throw e;
                }
                finally
                {
                    cmd.dispose();
                    connection.close();
                }
            }
        }
        /// <summary>
        /// 执行带一个存储过程参数的的sql语句。
        /// </summary>
        /// <param name="sqlstring">sql语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static object executesqlget(string sqlstring, string content)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                mysqlcommand cmd = new mysqlcommand(sqlstring, connection);
                mysql.data.mysqlclient.mysqlparameter myparameter = new mysql.data.mysqlclient.mysqlparameter("@content", sqldbtype.ntext);
                myparameter.value = content;
                cmd.parameters.add(myparameter);
                try
                {
                    connection.open();
                    object obj = cmd.executescalar();
                    if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (mysql.data.mysqlclient.mysqlexception e)
                {
                    throw e;
                }
                finally
                {
                    cmd.dispose();
                    connection.close();
                }
            }
        }
        /// <summary>
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
        /// </summary>
        /// <param name="strsql">sql语句</param>
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
        /// <returns>影响的记录数</returns>
        public static int executesqlinsertimg(string strsql, byte[] fs)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                mysqlcommand cmd = new mysqlcommand(strsql, connection);
                mysql.data.mysqlclient.mysqlparameter myparameter = new mysql.data.mysqlclient.mysqlparameter("@fs", sqldbtype.image);
                myparameter.value = fs;
                cmd.parameters.add(myparameter);
                try
                {
                    connection.open();
                    int rows = cmd.executenonquery();
                    return rows;
                }
                catch (mysql.data.mysqlclient.mysqlexception e)
                {
                    throw e;
                }
                finally
                {
                    cmd.dispose();
                    connection.close();
                }
            }
        }

        /// <summary>
        /// 执行一条计算查询结果语句，返回查询结果（object）。
        /// </summary>
        /// <param name="sqlstring">计算查询结果语句</param>
        /// <returns>查询结果（object）</returns>
        public static object getsingle(string sqlstring)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand(sqlstring, connection))
                {
                    try
                    {
                        connection.open();
                        object obj = cmd.executescalar();
                        if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        connection.close();
                        throw e;
                    }
                }
            }
        }
        public static object getsingle(string sqlstring, int times)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand(sqlstring, connection))
                {
                    try
                    {
                        connection.open();
                        cmd.commandtimeout = times;
                        object obj = cmd.executescalar();
                        if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        connection.close();
                        throw e;
                    }
                }
            }
        }
        /// <summary>
        /// 执行查询语句，返回mysqldatareader ( 注意：调用该方法后，一定要对mysqldatareader进行close )
        /// </summary>
        /// <param name="strsql">查询语句</param>
        /// <returns>mysqldatareader</returns>
        public static mysqldatareader executereader(string strsql)
        {
            mysqlconnection connection = new mysqlconnection(connectionstring);
            mysqlcommand cmd = new mysqlcommand(strsql, connection);
            try
            {
                connection.open();
                mysqldatareader myreader = cmd.executereader(commandbehavior.closeconnection);
                return myreader;
            }
            catch (mysql.data.mysqlclient.mysqlexception e)
            {
                throw e;
            }   

        }
        /// <summary>
        /// 执行查询语句，返回dataset
        /// </summary>
        /// <param name="sqlstring">查询语句</param>
        /// <returns>dataset</returns>
        public static dataset query(string sqlstring)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                dataset ds = new dataset();
                try
                {
                    connection.open();
                    mysqldataadapter command = new mysqldataadapter(sqlstring, connection);
                    command.fill(ds, "ds");
                }
                catch (mysql.data.mysqlclient.mysqlexception ex)
                {
                    throw new exception(ex.message);
                }
                return ds;
            }
        }
        public static dataset query(string sqlstring, int times)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                dataset ds = new dataset();
                try
                {
                    connection.open();
                    mysqldataadapter command = new mysqldataadapter(sqlstring, connection);
                    command.selectcommand.commandtimeout = times;
                    command.fill(ds, "ds");
                }
                catch (mysql.data.mysqlclient.mysqlexception ex)
                {
                    throw new exception(ex.message);
                }
                return ds;
            }
        }



        #endregion

        #region 执行带参数的sql语句

        /// <summary>
        /// 执行sql语句，返回影响的记录数
        /// </summary>
        /// <param name="sqlstring">sql语句</param>
        /// <returns>影响的记录数</returns>
        public static int executesql(string sqlstring, params mysqlparameter[] cmdparms)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand())
                {
                    try
                    {
                        preparecommand(cmd, connection, null, sqlstring, cmdparms);
                        int rows = cmd.executenonquery();
                        cmd.parameters.clear();
                        return rows;
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        throw e;
                    }
                }
            }
        }


        /// <summary>
        /// 执行多条sql语句，实现数据库事务。
        /// </summary>
        /// <param name="sqlstringlist">sql语句的哈希表（key为sql语句，value是该语句的mysqlparameter[]）</param>
        public static void executesqltran(hashtable sqlstringlist)
        {
            using (mysqlconnection conn = new mysqlconnection(connectionstring))
            {
                conn.open();
                using (mysqltransaction trans = conn.begintransaction())
                {
                    mysqlcommand cmd = new mysqlcommand();
                    try
                    {
                        //循环
                        foreach (dictionaryentry myde in sqlstringlist)
                        {
                            string cmdtext = myde.key.tostring();
                            mysqlparameter[] cmdparms = (mysqlparameter[])myde.value;
                            preparecommand(cmd, conn, trans, cmdtext, cmdparms);
                            int val = cmd.executenonquery();
                            cmd.parameters.clear();
                        }
                        trans.commit();
                    }
                    catch
                    {
                        trans.rollback();
                        throw;
                    }
                }
            }
        }
       
    
        /// <summary>
        /// 执行多条sql语句，实现数据库事务。
        /// </summary>
        /// <param name="sqlstringlist">sql语句的哈希表（key为sql语句，value是该语句的mysqlparameter[]）</param>
        public static void executesqltranwithindentity(hashtable sqlstringlist)
        {
            using (mysqlconnection conn = new mysqlconnection(connectionstring))
            {
                conn.open();
                using (mysqltransaction trans = conn.begintransaction())
                {
                    mysqlcommand cmd = new mysqlcommand();
                    try
                    {
                        int indentity = 0;
                        //循环
                        foreach (dictionaryentry myde in sqlstringlist)
                        {
                            string cmdtext = myde.key.tostring();
                            mysqlparameter[] cmdparms = (mysqlparameter[])myde.value;
                            foreach (mysqlparameter q in cmdparms)
                            {
                                if (q.direction == parameterdirection.inputoutput)
                                {
                                    q.value = indentity;
                                }
                            }
                            preparecommand(cmd, conn, trans, cmdtext, cmdparms);
                            int val = cmd.executenonquery();
                            foreach (mysqlparameter q in cmdparms)
                            {
                                if (q.direction == parameterdirection.output)
                                {
                                    indentity = convert.toint32(q.value);
                                }
                            }
                            cmd.parameters.clear();
                        }
                        trans.commit();
                    }
                    catch
                    {
                        trans.rollback();
                        throw;
                    }
                }
            }
        }
        /// <summary>
        /// 执行一条计算查询结果语句，返回查询结果（object）。
        /// </summary>
        /// <param name="sqlstring">计算查询结果语句</param>
        /// <returns>查询结果（object）</returns>
        public static object getsingle(string sqlstring, params mysqlparameter[] cmdparms)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand())
                {
                    try
                    {
                        preparecommand(cmd, connection, null, sqlstring, cmdparms);
                        object obj = cmd.executescalar();
                        cmd.parameters.clear();
                        if ((object.equals(obj, null)) || (object.equals(obj, system.dbnull.value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        /// 执行查询语句，返回mysqldatareader ( 注意：调用该方法后，一定要对mysqldatareader进行close )
        /// </summary>
        /// <param name="strsql">查询语句</param>
        /// <returns>mysqldatareader</returns>
        public static mysqldatareader executereader(string sqlstring, params mysqlparameter[] cmdparms)
        {
            mysqlconnection connection = new mysqlconnection(connectionstring);
            mysqlcommand cmd = new mysqlcommand();
            try
            {
                preparecommand(cmd, connection, null, sqlstring, cmdparms);
                mysqldatareader myreader = cmd.executereader(commandbehavior.closeconnection);
                cmd.parameters.clear();
                return myreader;
            }
            catch (mysql.data.mysqlclient.mysqlexception e)
            {
                throw e;
            }
            //            finally
            //            {
            //                cmd.dispose();
            //                connection.close();
            //            }    

        }

        /// <summary>
        /// 执行查询语句，返回dataset
        /// </summary>
        /// <param name="sqlstring">查询语句</param>
        /// <returns>dataset</returns>
        public static dataset query(string sqlstring, params mysqlparameter[] cmdparms)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                mysqlcommand cmd = new mysqlcommand();
                preparecommand(cmd, connection, null, sqlstring, cmdparms);
                using (mysqldataadapter da = new mysqldataadapter(cmd))
                {
                    dataset ds = new dataset();
                    try
                    {
                        da.fill(ds, "ds");
                        cmd.parameters.clear();
                    }
                    catch (mysql.data.mysqlclient.mysqlexception ex)
                    {
                        throw new exception(ex.message);
                    }
                    return ds;
                }
            }
        }


        private static void preparecommand(mysqlcommand cmd, mysqlconnection conn, mysqltransaction trans, string cmdtext, mysqlparameter[] cmdparms)
        {
            if (conn.state != connectionstate.open)
                conn.open();
            cmd.connection = conn;
            cmd.commandtext = cmdtext;
            if (trans != null)
                cmd.transaction = trans;
            cmd.commandtype = commandtype.text;//cmdtype;
            if (cmdparms != null)
            {


                foreach (mysqlparameter parameter in cmdparms)
                {
                    if ((parameter.direction == parameterdirection.inputoutput || parameter.direction == parameterdirection.input) &&
                        (parameter.value == null))
                    {
                        parameter.value = dbnull.value;
                    }
                    cmd.parameters.add(parameter);
                }
            }
        }

        #endregion


        #region 执行带参数的存储过程
        /// <summary>
        /// 执行带参数的存储过程
        /// </summary>
        /// <param name="sqlstring"></param>
        /// <param name="cmdparms"></param>
        /// <returns></returns>
        public static object executeproc(string sqlstring, params mysqlparameter[] cmdparms)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand())
                {
                    try
                    {

                        preparecommand(cmd, connection, null, sqlstring, cmdparms);
                        cmd.commandtype = commandtype.storedprocedure;
                        int rows = cmd.executenonquery();
                        console.writeline("返回值为 " + cmdparms[1].value);
                        cmd.parameters.clear();
                        return rows;
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        connection.close();
                        throw e;
                    }
                }
            }
        }
        /// <summary>
        /// 存储过程查询datatable
        /// </summary>
        /// <param name="sqlstring"></param>
        /// <param name="cmdparms"></param>
        /// <returns></returns>
        public static datatable queryproc(string sqlstring, params mysqlparameter[] cmdparms)
        {
            using (mysqlconnection connection = new mysqlconnection(connectionstring))
            {
                using (mysqlcommand cmd = new mysqlcommand())
                {
                    try
                    {

                        preparecommand(cmd, connection, null, sqlstring, cmdparms);
                        cmd.commandtype = commandtype.storedprocedure;
                        mysqldataadapter adapter = new mysqldataadapter(cmd);
                        datatable dt = new datatable();
                        adapter.fill(dt);
                        cmd.parameters.clear();
                        return dt;
                    }
                    catch (mysql.data.mysqlclient.mysqlexception e)
                    {
                        connection.close();
                        throw e;
                    }
                }
            }
        } 
        #endregion

        

    }

}

mysql-dbhelperproc