C#访问SQLServer增删改查代码实例

一个专门实现访问sql server数据库增删改查的操作代码，分享给大家，具体内容如下

using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.windows.forms;
using system.data;
using system.data.sqlclient;

namespace windowsformsapplication1
{
  public partial class form1 : form
  {
    public form1()
    {
      initializecomponent();
    }

    //查询
    private void button1_click(object sender, eventargs e)
    {
      string myconn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;trusted_connection=no";//定义数据库连接参数
      sqlconnection myconnection = new sqlconnection(myconn);//定义一个数据连接实例
      sqlcommand mycommand = new sqlcommand("select * from 图书借阅", myconnection); //定义一个数据库操作指令
      sqldataadapter selectadapter = new sqldataadapter();//定义一个数据适配器
      selectadapter.selectcommand = mycommand;//定义数据适配器的操作指令
      dataset mydataset = new dataset();//定义一个数据集
      myconnection.open();//打开数据库连接
      selectadapter.selectcommand.executenonquery();//执行数据库查询指令
      myconnection.close();//关闭数据库
      selectadapter.fill(mydataset);//填充数据集
      datagrid1.datasource = mydataset.tables[0];
      //datagrid1.databind();//将数据表格用数据集中的数据填充
    }

    //添加
    private void button2_click(object sender, eventargs e)
    {
      string myconn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;trusted_connection=no";
      sqlconnection myconnection = new sqlconnection(myconn);
      string myinsert = "insert into 图书借阅 (图书编号,读者编号,续借次数) values ('" + convert.tostring(textbox2.text) + "','" +
        convert.tostring(textbox3.text)+ "','"+convert.toint32(textbox4.text)+ "')";
      sqlcommand mycommand = new sqlcommand(myinsert, myconnection);
      try//异常处理
      {
        myconnection.open();
        mycommand.executenonquery();
        myconnection.close();
      }
      catch (exception ex)
      {
        messagebox.show(ex.message);
      }
    }

    //更新
    private void button3_click(object sender, eventargs e)
    {
      string myconn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;trusted_connection=no";
      sqlconnection myconnection = new sqlconnection(myconn);
      string myupdate = "update 图书借阅 set 操作员='" + textbox2.text + "'" + " where 借阅编号=" + "'" + textbox1.text + "'";
      sqlcommand mycommand = new sqlcommand(myupdate, myconnection);
      try
      {
        myconnection.open();
        mycommand.executenonquery();
        myconnection.close();
        textbox1.text = "";
      }
      catch (exception ex)
      {
        messagebox.show(ex.message);
      }
    }

    //删除
    private void button4_click(object sender, eventargs e)
    {
      string myconn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;trusted_connection=no";
      sqlconnection myconnection = new sqlconnection(myconn);
      string mydelete = "delete from 图书借阅 where 借阅编号=" + textbox1.text;
      sqlcommand mycommand = new sqlcommand(mydelete, myconnection);
      try
      {
        myconnection.open();
        mycommand.executenonquery();
        myconnection.close();
        textbox1.text = "";
      }
      catch (exception ex)
      {
        messagebox.show(ex.message);
      }
    }
  }
}

 数据库如下；

winform中查询成功；

插入时，因为借阅编号为自增，不能插入值，会自己生成；

更新，外键冲突；插入的图书编号为000999，无此图书，故出错；

插入成功；

更新操作员为"王老师"；

删除借阅编号为31的记录；

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。