Asp.Net操做MySql數據庫增刪改查

Asp.Net操做MySql數據庫增刪改查,話很少說直接步入正題。git源碼地址:https://git.oschina.net/gxiaopan/NetMySql.git html

一、安裝MySQL數據庫系統,目前最新版本爲5.7.17,能夠到官網 http://dev.mysql.com/downloads/mysql/ 下載安裝,注意安裝選擇Microsoft Windows平臺;mysql

msi格式直接可視化安裝便可,zip格式是本身解壓,解壓縮以後其實MySQL就可使用了,可是要進行配置,git

配置環境變量很簡單:web

個人電腦->屬性->高級->環境變量sql

選擇PATH,在其後面添加: 你的mysql bin文件夾的路徑 (如:C:\Program Files\MySQL\MySQL Server 5.6\bin )數據庫

PATH=.......;C:\Program Files\MySQL\MySQL Server 5.6\bin (注意是追加,不是覆蓋)ide

 

配置完環境變量以後先別忙着啓動mysql,咱們還須要修改一下配置文件(若是沒有配置,以後啓動的時候就會出現圖中的錯誤哦!:錯誤2 系統找不到文件),mysql-5.6.1X默認的配置文件是在C:\Program Files\MySQL\MySQL Server 5.6\my-default.ini,或者本身創建一個my.ini文件,lua

在其中修改或添加配置(如圖): spa

[mysqld] .net

basedir=C:\Program Files\MySQL\MySQL Server 5.6(mysql所在目錄) 

datadir=C:\Program Files\MySQL\MySQL Server 5.6\data (mysql所在目錄\data)


  1. MySQL 5.6 for Windows 解壓縮版配置安裝
    MySQL 5.6 for Windows 解壓縮版配置安裝
  2.  

    以管理員身份運行cmd(必定要用管理員身份運行,否則權限不夠),

    輸入:cd C:\Program Files\MySQL\MySQL Server 5.6\bin 進入mysql的bin文件夾(無論有沒有配置過環境變量,也要進入bin文件夾,不然以後啓動服務仍然會報錯誤2)

    輸入mysqld -install(若是不用管理員身份運行,將會由於權限不夠而出現錯誤:Install/Remove of the Service Denied!) 

    安裝成功

    MySQL 5.6 for Windows 解壓縮版配置安裝
    MySQL 5.6 for Windows 解壓縮版配置安裝
  3.  

    安裝成功後就要啓動服務了,繼續在cmd中輸入:net start mysql(如圖),服務啓動成功!

    此時不少人會出現錯誤,請看注意:

    注意:這個時候常常會出現錯誤2和錯誤1067。

    若是出現「錯誤2 系統找不到文件」,檢查一下是否修改過配置文件或者是否進入在bin目錄下操做,若是配置文件修改正確而且進入了bin文件夾,須要先刪除mysql(輸入 mysqld -remove)再從新安裝(輸入 mysqld -install);

    若是出現錯誤1067,那就是配置文件修改錯誤,確認一下配置文件是否正確。

    MySQL 5.6 for Windows 解壓縮版配置安裝
  4.  

    服務啓動成功以後,就能夠登陸了,如圖,輸入mysql -u root -p(第一次登陸沒有密碼,直接按回車過),登陸成功!

    MySQL 5.6 for Windows 解壓縮版配置安裝
  5.  

二、引用MySQL connector/Net組件,該組件在安裝MySQL安裝目錄內,好比本人電腦上的目錄是:

D:\Program Files (x86)\MySQL\Connector NET 6.7.4\Assemblies\v4.5\MySQL.Data.dll

或者到官網上下載 http://dev.mysql.com/downloads/connector/net/ 最新版本的MySQL connector/Net組件

須要說明的是,若是在正常安裝MySQL數據庫後,又更新了MySQL Connector/Net組件,則會出現版本不一樣的問題,這須要將ASP.NET中machine.config裏面關於MySQL引用 MySQL Connector/Net組件版本的語句註釋掉便可;

引用 MySQL connector/Net組件的辦法是在ASP.NET項目引用中添加地MySQL.Data.dll的引用,以下圖所示:

三、使用下面的代碼完成對數據庫的鏈接:  

 在web.config中配置鏈接字符串完成對MySQL數據庫的鏈接

 <connectionStrings>

   <add name="DBConnection"  connectionString="server=localhost;user id=root;password=123456;database=MySqlDatabaseName; pooling=true;" providerName="MySql.Data.MySqlClient/>

</connectionStrings>


編寫C#操做
MysqlHelper類:
MysqlHelper類 
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 
{ 
//數據庫鏈接字符串(web.config來配置),能夠動態更改connectionString支持多數據庫. 
// 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 
//執行SQL語句,返回影響的記錄數 
/// <summary> 
/// 執行SQL語句,返回影響的記錄數 
/// </summary> 
/// <param name="SQLString">SQL語句</param> 
/// <returns>影響的記錄數</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> 
/// 執行SQL語句,返回影響的記錄數 
/// </summary> 
/// <param name="SQLString">SQL語句</param> 
/// <returns>影響的記錄數</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; 
} 
} 
} 
} 
//執行多條SQL語句,實現數據庫事務。 
/// <summary> 
/// 執行多條SQL語句,實現數據庫事務。 
/// </summary> 
/// <param name="SQLStringList">多條SQL語句</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> 
/// 執行一條計算查詢結果語句,返回查詢結果(object)。 
/// </summary> 
/// <param name="SQLString">計算查詢結果語句</param> 
/// <returns>查詢結果(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> 
/// 執行一條計算查詢結果語句,返回查詢結果(object)。 
/// </summary> 
/// <param name="SQLString">計算查詢結果語句</param> 
/// <returns>查詢結果(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> 
/// 執行查詢語句,返回MySqlDataReader ( 注意:調用該方法後,必定要對MySqlDataReader進行Close ) 
/// </summary> 
/// <param name="strSQL">查詢語句</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> 
/// 執行查詢語句,返回MySqlDataReader ( 注意:調用該方法後,必定要對MySqlDataReader進行Close ) 
/// </summary> 
/// <param name="strSQL">查詢語句</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> 
/// 執行查詢語句,返回DataTable 
/// </summary> 
/// <param name="SQLString">查詢語句</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> 
/// 執行查詢語句,返回DataSet 
/// </summary> 
/// <param name="SQLString">查詢語句</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]; 
} 
} 
} 
//獲取起始頁碼和結束頁碼 
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> 
/// 獲取分頁數據 在不用存儲過程狀況下 
/// </summary> 
/// <param name="recordCount">總記錄條數</param> 
/// <param name="selectList">選擇的列逗號隔開,支持top num</param> 
/// <param name="tableName">表名字</param> 
/// <param name="whereStr">條件字符 必須前加 and</param> 
/// <param name="orderExpression">排序 例如 ID</param> 
/// <param name="pageIdex">當前索引頁</param> 
/// <param name="pageSize">每頁記錄數</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的時候 
{ 
DataTable dtTemp = ExecuteDataTable(sqlStr); 
rows = dtTemp.Rows.Count; 
} 
else //不含有top的時候 
{ 
string sqlCount = string.Format("select count(*) from {0} where 1=1 {1} ", tableName, whereStr); 
//獲取行數 
object obj = ExecuteScalar(sqlCount); 
if (obj != null) 
{ 
rows = Convert.ToInt32(obj); 
} 
} 
dt = ExecuteDataTable(sqlStr, (pageIdex-1)*pageSize, pageSize); 
recordCount = rows; 
return dt; 
} 
#region 建立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 
} 
} 
 git源碼地址:https://git.oschina.net/gxiaopan/NetMySql.git
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