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教你Asp.net下使用mysql数据库的步骤

时间:2019-10-04 20:12     来源/作者:asp.net开发网

1. 首先需要安装mysql, 
去mysql.com官网都可以,一路next,安装好后,有个简单配置,提示有个设置登录密码和服务名称, 
默认localhost,用户名root,密码自己设置。 

2. 安装了mysql数据库后,需要一个管理工具,就像sqlserver的SQL Server Management Studio一样,推荐使用Navicat for MySQL(http://www.zzvips.com/soft/208.html),安装后,打开界面如下图 


确定后,右键新建的连接名字,就可以建数据库,建表了。字段类型和sqlserver基本一致。 

教你Asp.net下使用mysql数据库的步骤

3. Asp.net连接mysql 不推荐使用ODBC,推荐是用mysql官网提供的组件动)MySQL.Data.Dll,官网地址, 
http://dev.mysql.com/downloads/connector/net/5.1.html;可能需要简单的注册下用户,看好版本,如果嫌弃麻烦可以直接下载一个相应版本的MySQL.Data.Dll ,放入bin下,增加引用即可 
4. 我自己写的一个简单MysqlHelper.cs类,操作和sqlserver 很相似。有了这个类,你就知道怎么用了,很简单 
代码如下 

复制代码代码如下:


MysqlHelper类 
using System; 
using System.Collections; 
using System.Collections.Specialized; 
using System.Data; 
using MySql.Data.MySqlClient; 
using System.Configuration; 
using System.Data.Common; 
using System.Collections.Generic; 
using System.Text.RegularExpressions; 
namespace LOAF.DAL 

public class MysqlHelper 

//数据库连接字符串(web.config来配置),可以动态更改connectionString支持多数据库. 
// public static string connectionString = ConfigurationManager.ConnectionStrings["ConnDB"].ConnectionString; 
public static string connectionString = ConfigurationManager.AppSettings["MySQL"]; 
//public string m = ConfigurationManager.AppSettings["MySQL"]; 
public MysqlHelper() { } 
#region ExecuteNonQuery 
//执行SQL语句,返回影响的记录数 
/// <summary> 
/// 执行SQL语句,返回影响的记录数 
/// </summary> 
/// <param name="SQLString">SQL语句</param> 
/// <returns>影响的记录数</returns> 
public static int ExecuteNonQuery(string SQLString) 

using (MySqlConnection connection = new MySqlConnection(connectionString)) 

using (MySqlCommand cmd = new MySqlCommand(SQLString, connection)) 

try 

connection.Open(); 
int rows = cmd.ExecuteNonQuery(); 
return rows; 

catch (MySql.Data.MySqlClient.MySqlException e) 

connection.Close(); 
throw e; 




/// <summary> 
/// 执行SQL语句,返回影响的记录数 
/// </summary> 
/// <param name="SQLString">SQL语句</param> 
/// <returns>影响的记录数</returns> 
public static int ExecuteNonQuery(string SQLString, params MySqlParameter[] cmdParms) 

using (MySqlConnection connection = new MySqlConnection(connectionString)) 

using (MySqlCommand cmd = new MySqlCommand()) 

try 

PrepareCommand(cmd, connection, null, SQLString, cmdParms); 
int rows = cmd.ExecuteNonQuery(); 
cmd.Parameters.Clear(); 
return rows; 

catch (MySql.Data.MySqlClient.MySqlException e) 

throw e; 




//执行多条SQL语句,实现数据库事务。 
/// <summary> 
/// 执行多条SQL语句,实现数据库事务。 
/// </summary> 
/// <param name="SQLStringList">多条SQL语句</param> 
public static bool ExecuteNoQueryTran(List<String> SQLStringList) 

using (MySqlConnection conn = new MySqlConnection(connectionString)) 

conn.Open(); 
MySqlCommand cmd = new MySqlCommand(); 
cmd.Connection = conn; 
MySqlTransaction tx = conn.BeginTransaction(); 
cmd.Transaction = tx; 
try 

for (int n = 0; n < SQLStringList.Count; n++) 

string strsql = SQLStringList[n]; 
if (strsql.Trim().Length > 1) 

cmd.CommandText = strsql; 
PrepareCommand(cmd, conn, tx, strsql, null); 
cmd.ExecuteNonQuery(); 


cmd.ExecuteNonQuery(); 
tx.Commit(); 
return true; 

catch 

tx.Rollback(); 
return false; 



#endregion 
#region ExecuteScalar 
/// <summary> 
/// 执行一条计算查询结果语句,返回查询结果(object)。 
/// </summary> 
/// <param name="SQLString">计算查询结果语句</param> 
/// <returns>查询结果(object)</returns> 
public static object ExecuteScalar(string SQLString) 

using (MySqlConnection connection = new MySqlConnection(connectionString)) 

using (MySqlCommand cmd = new MySqlCommand(SQLString, connection)) 

try 

connection.Open(); 
object obj = cmd.ExecuteScalar(); 
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) 

return null; 

else 

return obj; 


catch (MySql.Data.MySqlClient.MySqlException e) 

connection.Close(); 
throw e; 




/// <summary> 
/// 执行一条计算查询结果语句,返回查询结果(object)。 
/// </summary> 
/// <param name="SQLString">计算查询结果语句</param> 
/// <returns>查询结果(object)</returns> 
public static object ExecuteScalar(string SQLString, params MySqlParameter[] cmdParms) 

using (MySqlConnection connection = new MySqlConnection(connectionString)) 

using (MySqlCommand cmd = new MySqlCommand()) 

try 

PrepareCommand(cmd, connection, null, SQLString, cmdParms); 
object obj = cmd.ExecuteScalar(); 
cmd.Parameters.Clear(); 
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) 

return null; 

else 

return obj; 


catch (MySql.Data.MySqlClient.MySqlException e) 

throw e; 




#endregion 
#region ExecuteReader 
/// <summary> 
/// 执行查询语句,返回MySqlDataReader ( 注意:调用该方法后,一定要对MySqlDataReader进行Close ) 
/// </summary> 
/// <param name="strSQL">查询语句</param> 
/// <returns>MySqlDataReader</returns> 
public static MySqlDataReader ExecuteReader(string strSQL) 

MySqlConnection connection = new MySqlConnection(connectionString); 
MySqlCommand cmd = new MySqlCommand(strSQL, connection); 
try 

connection.Open(); 
MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); 
return myReader; 

catch (MySql.Data.MySqlClient.MySqlException e) 

throw e; 


/// <summary> 
/// 执行查询语句,返回MySqlDataReader ( 注意:调用该方法后,一定要对MySqlDataReader进行Close ) 
/// </summary> 
/// <param name="strSQL">查询语句</param> 
/// <returns>MySqlDataReader</returns> 
public static MySqlDataReader ExecuteReader(string SQLString, params MySqlParameter[] cmdParms) 

MySqlConnection connection = new MySqlConnection(connectionString); 
MySqlCommand cmd = new MySqlCommand(); 
try 

PrepareCommand(cmd, connection, null, SQLString, cmdParms); 
MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); 
cmd.Parameters.Clear(); 
return myReader; 

catch (MySql.Data.MySqlClient.MySqlException e) 

throw e; 

// finally 
// { 
// cmd.Dispose(); 
// connection.Close(); 
// } 

#endregion 
#region ExecuteDataTable 
/// <summary> 
/// 执行查询语句,返回DataTable 
/// </summary> 
/// <param name="SQLString">查询语句</param> 
/// <returns>DataTable</returns> 
public static DataTable ExecuteDataTable(string SQLString) 

using (MySqlConnection connection = new MySqlConnection(connectionString)) 

DataSet ds = new DataSet(); 
try 

connection.Open(); 
MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection); 
command.Fill(ds, "ds"); 

catch (MySql.Data.MySqlClient.MySqlException ex) 

throw new Exception(ex.Message); 

return ds.Tables[0]; 


/// <summary> 
/// 执行查询语句,返回DataSet 
/// </summary> 
/// <param name="SQLString">查询语句</param> 
/// <returns>DataTable</returns> 
public static DataTable ExecuteDataTable(string SQLString, params MySqlParameter[] cmdParms) 

using (MySqlConnection connection = new MySqlConnection(connectionString)) 

MySqlCommand cmd = new MySqlCommand(); 
PrepareCommand(cmd, connection, null, SQLString, cmdParms); 
using (MySqlDataAdapter da = new MySqlDataAdapter(cmd)) 

DataSet ds = new DataSet(); 
try 

da.Fill(ds, "ds"); 
cmd.Parameters.Clear(); 

catch (MySql.Data.MySqlClient.MySqlException ex) 

throw new Exception(ex.Message); 

return ds.Tables[0]; 



//获取起始页码和结束页码 
public static DataTable ExecuteDataTable(string cmdText, int startResord, int maxRecord) 

using (MySqlConnection connection = new MySqlConnection(connectionString)) 

DataSet ds = new DataSet(); 
try 

connection.Open(); 
MySqlDataAdapter command = new MySqlDataAdapter(cmdText, connection); 
command.Fill(ds, startResord, maxRecord, "ds"); 

catch (MySql.Data.MySqlClient.MySqlException ex) 

throw new Exception(ex.Message); 

return ds.Tables[0]; 


#endregion 
/// <summary> 
/// 获取分页数据 在不用存储过程情况下 
/// </summary> 
/// <param name="recordCount">总记录条数</param> 
/// <param name="selectList">选择的列逗号隔开,支持top num</param> 
/// <param name="tableName">表名字</param> 
/// <param name="whereStr">条件字符 必须前加 and</param> 
/// <param name="orderExpression">排序 例如 ID</param> 
/// <param name="pageIdex">当前索引页</param> 
/// <param name="pageSize">每页记录数</param> 
/// <returns></returns> 
public static DataTable getPager(out int recordCount, string selectList, string tableName, string whereStr, string orderExpression, int pageIdex, int pageSize) 

int rows = 0; 
DataTable dt = new DataTable(); 
MatchCollection matchs = Regex.Matches(selectList, @"top\s+\d{1,}", RegexOptions.IgnoreCase);//含有top 
string sqlStr = sqlStr = string.Format("select {0} from {1} where 1=1 {2}", selectList, tableName, whereStr); 
if (!string.IsNullOrEmpty(orderExpression)) { sqlStr += string.Format(" Order by {0}", orderExpression); } 
if (matchs.Count > 0) //含有top的时候 

DataTable dtTemp = ExecuteDataTable(sqlStr); 
rows = dtTemp.Rows.Count; 

else //不含有top的时候 

string sqlCount = string.Format("select count(*) from {0} where 1=1 {1} ", tableName, whereStr); 
//获取行数 
object obj = ExecuteScalar(sqlCount); 
if (obj != null) 

rows = Convert.ToInt32(obj); 


dt = ExecuteDataTable(sqlStr, (pageIdex-1)*pageSize, pageSize); 
recordCount = rows; 
return dt; 

#region 创建command 
private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText, MySqlParameter[] cmdParms) 

if (conn.State != ConnectionState.Open) 
conn.Open(); 
cmd.Connection = conn; 
cmd.CommandText = cmdText; 
if (trans != null) 
cmd.Transaction = trans; 
cmd.CommandType = CommandType.Text;//cmdType; 
if (cmdParms != null) 

foreach (MySqlParameter parameter in cmdParms) 

if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) && 
(parameter.Value == null)) 

parameter.Value = DBNull.Value; 

cmd.Parameters.Add(parameter); 



#endregion 


5. 需要注意的地方有如下几点 
1)在sqlserver中参数化sql语句是用“@”符号,在mysql里面需要是用?号,切记,切记. 
2 )还有就是sqlserver中删除表可以这样写delete news where ID=12,但是在mysql里面 是delete from news where ID=12,收了from报错 
3 )我在使用过程中遇到了中文乱码,网上大部分解决办法是把表的设置成utf-8字符集。以及 C:\Program Files\MySQL\MySQL Server 5.1路径下my.ini 打开找到两处 
default-character-set 都设置成=utf8,但是我的还是乱码,最后 
教你Asp.net下使用mysql数据库的步骤
6.以上是我的个人总结,有可能很肤浅,不要见笑,有问题共同解决,谢谢~

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