下面是我封装好的连接数据库的类，直接调用即可。
复制代码 代码如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using MySql.Data.MySqlClient;
namespace DAL
{
public class GetConnection
{
private static MySqlConnection _connection;
/// <summary>
/// 获取数据库连接桥
/// </summary>
private static MySqlConnection Connection
{
get
{
//string connectionString = ConfigurationManager.AppSettings["ConnectionString"];
string connectionString = "server=localhost;user id=root; password=root; database=system; pooling=false";
//server=222.222.222.222;port=3306;uid=user;pwd=;database=basename;远程连接的
//string connectionString = "Data Source=202.192.72.22;Initial Catalog=wwj;Persist Security Info=True;User ID=wwj;Password=wwj123";
if (_connection == null)
{
_connection = new MySqlConnection(connectionString);
_connection.Open();
}
if (_connection.State == ConnectionState.Closed)
{
_connection.Open();
}
if (_connection.State == ConnectionState.Broken)
{
_connection.Close();
_connection.Open();
}
return GetConnection._connection;
}
}
/// <summary>
/// 获取表数据
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static MySqlDataReader GetDataRead(string sql)
{
MySqlCommand command = new MySqlCommand(sql, Connection);
MySqlDataReader read = command.ExecuteReader();
return read;
}
public static int NoSelect(string sql)
{
MySqlCommand command = new MySqlCommand(sql, Connection);
int row = command.ExecuteNonQuery();
return row;
}
public static DataTable GetDataTable(string sql)
{
MySqlCommand command = new MySqlCommand(sql, Connection);
DataTable dt = new DataTable();
MySqlDataAdapter sda = new MySqlDataAdapter(command);
sda.Fill(dt);
return dt;
}
/// <summary>
/// 执行sql语句，返回一行一列。。
/// </summary>
/// <param name="sql">SQL语句</param>
/// <returns></returns>
public static string GetScalar(string sql)
{
MySqlCommand command = new MySqlCommand(sql, Connection);
return command.ExecuteScalar().ToString();
}
}
}
比如说你想执行删除的，你可以调用GetConnection.NoSelect("delete from UserInfo where Id=1");读数据库的某一张表，可以调用GetConnection.GetDataTable("select * from UserInfo");调用都很方便。
