黑马程序员之C#学习笔记:用户实例连接非内嵌式数据库

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data.SqlClient;

using System.Data;

namespace MyDataBase

public class MyDataBaseService

{

/// <summary>

/// 获取数据库连接

/// </summary>

/// <returns></returns>

private static SqlConnection GetConn()

{

SqlConnection conn = new SqlConnection();

string connStr = "server=SQL Server连接计算机名称;uid=用户实例账号;pwd=密码;database=数据库名称";

conn.ConnectionString = connStr;

conn.Open();

return conn;

}

/// <summary>

/// 执行修改sql语句，如insert\update\delete

/// </summary>

/// <param name="sql"></param>

/// <returns></returns>

public static int ExecuteModi(string sql)

{

using (SqlConnection conn = GetConn())

{

SqlCommand cmd = new SqlCommand();//创建执行命令的对象

cmd.Connection = conn;//指定数据库连接

cmd.CommandText = sql;//指定要执行的sql语句

try

{

return cmd.ExecuteNonQuery();//执行， 并返回受影响的行数

}

catch

{

return -2;

}

}

}

/// <summary>

/// 执行查询的sql语句，如select

/// </summary>

/// <param name="sql"></param>

/// <returns></returns>

public static DataTable OpenQuery(string sql)

{

using (SqlConnection conn = GetConn())

{

SqlDataAdapter sda = new SqlDataAdapter(sql, conn);

DataSet ds = new DataSet();

sda.Fill(ds);

return ds.Tables[0];

}

}

}

}

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2345王牌技术员联盟、2345王牌技术员联盟、期待与您交流！---------------------------------------------------------