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查字典教程网。
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