C#工具:Ado.Net SqlServer数据库 MySql数据库
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2022-10-06 16:19:17
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.T ......
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;
}
}
}
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
}
}
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