ADO.NET之5-使用Command对象删除记录—ShinePans

源代码: using System;using System.Collections.Generic;using System.Data;using System.Data.SqlClient;using System.Linq;using System.Text;using System.Threading.Tasks;namespace SQLTest{ class Program { static void Main(string[] args) { //连

源代码:

using System;using System.Collections.Generic;using System.Data;using System.Data.SqlClient;using System.Linq;using System.Text;using System.Threading.Tasks;namespace SQLTest{    class Program    {        static void Main(string[] args)        {            //连接数据库            string connection =                "server=潘尚\\SQLEXPRESS;database=db_test;Trusted_Connection=true";            SqlConnection sc = new SqlConnection(connection);            sc.ConnectionString = connection;            try            {                sc.Open();  //打开数据库连接                Console.WriteLine("已经打开数据库连接!");                string cmdtext = "DELETE FROM db_student WHERE student_name=@name";                SqlCommand cmd = new SqlCommand(cmdtext, sc);                cmd.Parameters.Add("@name", SqlDbType.VarChar).Value = "潘";                int i = cmd.ExecuteNonQuery();                if (i > 0) Console.WriteLine("删除记录成功!");                //////添加记录的代码//////            /*    SqlCommand cmd = new SqlCommand();//创建SqlCom<i>本文来源gaodai$ma#com搞$代*码网2</i>mand对象                cmd.CommandType = CommandType.Text; //设置执行文本命令                cmd.Connection = sc; //设置对象属性                cmd.CommandText =                     "INSERT INTO db_student(student_name,student_age,student_address,student_grade)VALUES(@name,@age,@address,@grade)";                //添加参数并为参数赋值                cmd.Parameters.Add("@name", SqlDbType.VarChar, 10).Value = "潘";                cmd.Parameters.Add("@age", SqlDbType.Int).Value = 19;                cmd.Parameters.Add("@address", SqlDbType.VarChar).Value = "武汉";                cmd.Parameters.Add("@grade", SqlDbType.Int).Value = 100;                int i = cmd.ExecuteNonQuery(); //执行数据库添加记录命令                if (i > 0) Console.WriteLine("添加记录成功"); //控制台输出添加记录             * ////添加记录的代码///////*/            }            catch (Exception ex)            {                Console.WriteLine("打开数据库错误:{0}", ex.Message);            }            finally            {                sc.Close();                Console.WriteLine("数据库连接已关闭!");            }            System.Console.ReadLine();        }    }}

删除执行:

删除后的状态:

总结:注意cmdtext的正确性

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