MySqlDBHelper
Posted 邢帅杰
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了MySqlDBHelper相关的知识，希望对你有一定的参考价值。
代码：
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Text; using System.Data; using System.Collections; using mysql.Data.MySqlClient; using MySql.Data.Types; using System.Configuration; using System.IO; namespace DALProfile { public class MySqlDBHelper { //Get the database connectionstring, which are static variables and readonly, all project documents can be used directly, but can not modify it //the database connectionString public static string ConnectionStringManager { get { return connectionStringManager; } } //This connectionString for the local test public static readonly string connectionStringManager = System.Configuration.ConfigurationManager.ConnectionStrings["MySQLConnString"].ConnectionString; //ConfigurationManager.ConnectionStrings["MySQLConnString"].ConnectionString; //hashtable to store the parameter information, the hash table can store any type of argument //Here the hashtable is static types of static variables, since it is static, that is a definition of global use. //All parameters are using this hash table, how to ensure that others in the change does not affect their time to read it //Before ,the method can use the lock method to lock the table, does not allow others to modify.when it has readed then unlocked table. //Now .NET provides a HashTable‘s Synchronized methods to achieve the same function, no need to manually lock, completed directly by the system framework private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable()); /// <summary> /// Execute a SqlCommand command that does not return value, by appointed and specified connectionstring /// The parameter list using parameters that in array forms /// </summary> /// <remarks> /// Usage example: /// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, /// "PublishOrders", new MySqlParameter("@prodid", 24)); /// </remarks> /// <param name="connectionString">a valid database connectionstring</param> /// <param name="cmdType">MySqlCommand command type (stored procedures, T-SQL statement, and so on.) </param> /// <param name="cmdText">stored procedure name or T-SQL statement</param> /// <param name="commandParameters">MySqlCommand to provide an array of parameters used in the list</param> /// <returns>Returns a value that means number of rows affected/returns> public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters) { MySqlCommand cmd = new MySqlCommand(); using (MySqlConnection conn = new MySqlConnection(connectionString)) { PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); int val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } } /// <summary> /// Execute a SqlCommand command that does not return value, by appointed and specified connectionstring /// The parameter list using parameters that in array forms /// </summary> /// <remarks> /// Usage example: /// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, /// "PublishOrders", new MySqlParameter("@prodid", 24)); /// </remarks> /// <param name="cmdType">MySqlCommand command type (stored procedures, T-SQL statement, and so on.) </param> /// <param name="connectionString">a valid database connectionstring</param> /// <param name="cmdText">stored procedure name or T-SQL statement</param> /// <param name="commandParameters">MySqlCommand to provide an array of parameters used in the list</param> /// <returns>Returns true or false </returns> public static bool ExecuteNonQuery(CommandType cmdType, string connectionString, string cmdText, params MySqlParameter[] commandParameters) { MySqlCommand cmd = new MySqlCommand(); using (MySqlConnection conn = new MySqlConnection(connectionString)) { PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); try { int val = cmd.ExecuteNonQuery(); return true; } catch { return false; } finally { cmd.Parameters.Clear(); } } } /// <summary> /// Execute a SqlCommand command that does not return value, by appointed and specified connectionstring /// Array of form parameters using the parameter list /// </summary> /// <param name="conn">connection</param> /// <param name="cmdType">MySqlCommand command type (stored procedures, T-SQL statement, and so on.)</param> /// <param name="cmdText">stored procedure name or T-SQL statement</param> /// <param name="commandParameters">MySqlCommand to provide an array of parameters used in the list</param> /// <returns>Returns a value that means number of rows affected</returns> public static int ExecuteNonQuery(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters) { MySqlCommand cmd = new MySqlCommand(); PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); int val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } /// <summary> /// Execute a SqlCommand command that does not return value, by appointed and specified connectionstring /// Array of form parameters using the parameter list /// </summary> /// <param name="conn">sql Connection that has transaction</param> /// <param name="cmdType">SqlCommand command type (stored procedures, T-SQL statement, and so on.)</param> /// <param name="cmdText">stored procedure name or T-SQL statement</param> /// <param name="commandParameters">MySqlCommand to provide an array of parameters used in the list</param> /// <returns>Returns a value that means number of rows affected </returns> public static int ExecuteNonQuery(MySqlTransaction trans, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters) { MySqlCommand cmd = new MySqlCommand(); PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters); int val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } /// <summary> /// Call method of sqldatareader to read data /// </summary> /// <param name="connectionString">connectionstring</param> /// <param name="cmdType">command type, such as using stored procedures: CommandType.StoredProcedure</param> /// <param name="cmdText">stored procedure name or T-SQL statement</param> /// <param name="commandParameters">parameters</param> /// <returns>SqlDataReader type of data collection</returns> public static MySqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters) { MySqlCommand cmd = new MySqlCommand(); MySqlConnection conn = new MySqlConnection(connectionString); // we use a try/catch here because if the method throws an exception we want to // close the connection throw code, because no datareader will exist, hence the // commandBehaviour.CloseConnection will not work try { PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); MySqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); cmd.Parameters.Clear(); return rdr; } catch { conn.Close(); throw; } } /// <summary> /// use the ExectueScalar to read a single result /// </summary> /// <param name="connectionString">connectionstring</param> /// <param name="cmdType">command type, such as using stored procedures: CommandType.StoredProcedure</param> /// <param name="cmdText">stored procedure name or T-SQL statement</param> /// <param name="commandParameters">parameters</param> /// <returns>a value in object type</returns> public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters) { MySqlCommand cmd = new MySqlCommand(); using (MySqlConnection connection = new MySqlConnection(connectionString)) { PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters); object val = cmd.ExecuteScalar(); cmd.Parameters.Clear(); return val; } } public static DataTable ExecuteDataTable(string connectionString, string cmdText, params MySqlParameter[] commandParameters) { DataSet retSet = new DataSet(); using (MySqlDataAdapter msda = new MySqlDataAdapter(cmdText, connectionString)) { msda.Fill(retSet); } if (retSet != null && retSet.Tables.Count > 0) { return retSet.Tables[0]; } return null; } public static DataTable ExecuteDataTable(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters) { DataSet retSet = new DataSet(); MySqlCommand cmd = new MySqlCommand(); using (MySqlConnection connection = new MySqlConnection(connectionString)) { PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters); using (MySqlDataAdapter msda = new MySqlDataAdapter(cmd)) { msda.Fill(retSet); } } if (retSet != null && retSet.Tables.Count > 0) { return retSet.Tables[0]; } return null; } public static DataSet GetDataSet(string connectionString, string cmdText, params MySqlParameter[] commandParameters) { DataSet retSet = new DataSet(); using (MySqlDataAdapter msda = new MySqlDataAdapter(cmdText, connectionString)) { msda.Fill(retSet); } return retSet; } /// <summary> /// cache the parameters in the HashTable /// </summary> /// <param name="cacheKey">hashtable key name</param> /// <param name="commandParameters">the parameters that need to cached</param> public static void CacheParameters(string cacheKey, params MySqlParameter[] commandParameters) { parmCache[cacheKey] = commandParameters; } /// <summary> /// get parameters in hashtable by cacheKey /// </summary> /// <param name="cacheKey">hashtable key name</param> /// <returns>the parameters</returns> public static MySqlParameter[] GetCachedParameters(string cacheKey) { MySqlParameter[] cachedParms = (MySqlParameter[])parmCache[cacheKey]; if (cachedParms == null) return null; MySqlParameter[] clonedParms = new MySqlParameter[cachedParms.Length]; for (int i = 0, j = cachedParms.Length; i < j; i++) clonedParms[i] = (MySqlParameter)((ICloneable)cachedParms[i]).Clone(); return clonedParms; } /// <summary> ///Prepare parameters for the implementation of the command /// </summary> /// <param name="cmd">mySqlCommand command</param> /// <param name="conn">database connection that is existing</param> /// <param name="trans">database transaction processing </param> /// <param name="cmdType">SqlCommand command type (stored procedures, T-SQL statement, and so on.) </param> /// <param name="cmdText">Command text, T-SQL statements such as Select * from Products</param> /// <param name="cmdParms">return the command that has parameters</param> private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, CommandType cmdType, 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 = cmdType; if (cmdParms != null) foreach (MySqlParameter parm in cmdParms) cmd.Parameters.Add(parm); } #region parameters /// <summary> /// Set parameters /// </summary> /// <param name="ParamName">parameter name</param> /// <param name="DbType">data type</param> /// <param name="Size">type size</param> /// <param name="Direction">input or output</param> /// <param name="Value">set the value</param> /// <returns>Return parameters that has been assigned</returns> public static MySqlParameter CreateParam(string ParamName, MySqlDbType DbType, Int32 Size, ParameterDirection Direction, object Value) { MySqlParameter param; if (Size > 0) { param = new MySqlParameter(ParamName, DbType, Size); } else { param = new MySqlParameter(ParamName, DbType); } param.Direction = Direction; if (!(Direction == ParameterDirection.Output && Value == null)) { param.Value = Value; } return param; } /// <summary> /// set Input parameters /// </summary> /// <param name="ParamName">parameter names, such as:@ id </param> /// <param name="DbType">parameter types, such as: MySqlDbType.Int</param> /// <param name="Size">size parameters, such as: the length of character type for the 100</param> /// <param name="Value">parameter value to be assigned</param> /// <returns>Parameters</returns> public static MySqlParameter CreateInParam(string ParamName, MySqlDbType DbType, int Size, object Value) { return CreateParam(ParamName, DbType, Size, ParameterDirection.Input, Value); } /// <summary> /// Output parameters /// </summary> /// <param name="ParamName">parameter names, such as:@ id</param> /// <param name="DbType">parameter types, such as: MySqlDbType.Int</param> /// <param name="Size">size parameters, such as: the length of character type for the 100</param> /// <param name="Value">parameter value to be assigned</param> /// <returns>Parameters</returns> public static MySqlParameter CreateOutParam(string ParamName, MySqlDbType DbType, int Size) { return CreateParam(ParamName, DbType, Size, ParameterDirection.Output, null); } /// <summary> /// Set return parameter value /// </summary> /// <param name="ParamName">parameter names, such as:@ id</param> /// <param name="DbType">parameter types, such as: MySqlDbType.Int</param> /// <param name="Size">size parameters, such as: the length of character type for the 100</param> /// <param name="Value">parameter value to be assigned<</param> /// <returns>Parameters</returns> public static MySqlParameter CreateReturnParam(string ParamName, MySqlDbType DbType, int Size) { return CreateParam(ParamName, DbType, Size, ParameterDirection.ReturnValue, null); } /// <summary> /// Generate paging storedProcedure parameters /// </summary> /// <param name="CurrentIndex">CurrentPageIndex</param> /// <param name="PageSize">pageSize</param> /// <param name="WhereSql">query Condition</param> /// <param name="TableName">tableName</param> /// <param name="Columns">columns to query</param> /// <param name="Sort">sort</param> /// <returns>MySqlParameter collection</returns> public static MySqlParameter[] GetPageParm(int CurrentIndex, int PageSize, string WhereSql, string TableName, string Columns, Hashtable Sort) { MySqlParameter[] parm = { MySqlDBHelper.CreateInParam("@CurrentIndex", MySqlDbType.Int32, 4, CurrentIndex ), MySqlDBHelper.CreateInParam("@PageSize", MySqlDbType.Int32, 4, PageSize ), MySqlDBHelper.CreateInParam("@WhereSql", MySqlDbType.VarChar, 2500, WhereSql ), MySqlDBHelper.CreateInParam("@TableName", MySqlDbType.VarChar, 20, TableName ), MySqlDBHelper.CreateInParam("@Column", MySqlDbType.VarChar, 2500, Columns ), MySqlDBHelper.CreateInParam("@Sort", MySqlDbType.VarChar, 50, GetSort(Sort) ), MySqlDBHelper.CreateOutParam("@RecordCount", MySqlDbType.Int32, 4 ) }; return parm; } /// <summary> /// Statistics data that in table /// </summary> /// <param name="TableName">table name</param> /// <param name="Columns">Statistics column</param> /// <param name="WhereSql">conditions</param> /// <returns>Set of parameters</returns> public static MySqlParameter[] GetCountParm(string TableName, string Columns, string WhereSql) { MySqlParameter[] parm = { MySqlDBHelper.CreateInParam("@TableName", MySqlDbType.VarChar, 20, TableName ), MySqlDBHelper.CreateInParam("@CountColumn", MySqlDbType.VarChar, 20, Columns ), MySqlDBHelper.CreateInParam("@WhereSql", MySqlDbType.VarChar, 250, WhereSql ), MySqlDBHelper.CreateOutParam("@RecordCount", MySqlDbType.Int32, 4 ) }; return parm; } /// <summary> /// Get the sql that is Sorted /// </summary> /// <param name="sort"> sort column and values</param> /// <returns>SQL sort string</returns> private static string GetSort(Hashtable sort) { string str = ""; int i = 0; if (sort != null && sort.Count > 0) { foreach (DictionaryEntry de in sort) { i++; str += de.Key + " " + de.Value; if (i != sort.Count) { str += ","; } } } return str; } /// <summary> /// execute a trascation include one or more sql sentence(author:donne yin) /// </summary> /// <param name="connectionString"></param> /// <param name="cmdType"></param> /// <param name="cmdTexts"></param> /// <param name="commandParameters"></param> /// <returns>execute trascation result(success: true | fail: false)</returns> public static bool ExecuteTransaction(string connectionString, CommandType cmdType, string[] cmdTexts, params MySqlParameter[][] commandParameters) { MySqlConnection myConnection = new MySqlConnection(connectionString); //get the connection object myConnection.Open(); //open the connection MySqlTransaction myTrans = myConnection.BeginTransaction(); //begin a trascation MySqlCommand cmd = new MySqlCommand(); cmd.Connection = myConnection; cmd.Transaction = myTrans; try { for (int i = 0; i < cmdTexts.Length; i++) { PrepareCommand(cmd, myConnection, null, cmdType, cmdTexts[i], commandParameters[i]); cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); } myTrans.Commit(); } catch { myTrans.Rollback(); return false; } finally { myConnection.Close(); } return true; } #endregion /// <summary> /// 分页获得数据 /// </summary> /// <param name="PageIndex">页码</param> /// <param name="PageSize">每页显示数据量</param> /// <param name="TableName">表名，可以是自定义查询集合</param> /// <param name="_Where">条件语句，需要以where开头</param> /// <param name="OrderStr">排序语句</param> /// <param name="RecordCount">记录数 输出参数</param> /// <param name="PageCount">总页数 输出参数</param> /// <returns></returns> public static DataTable GetDataTableByPage(string connectionString, int PageIndex, int PageSize, string TableName, string _Where, string OrderStr, out int RecordCount, out int PageCount) { string selectText = @"SELECT * FROM " + TableName + " " + _Where + " " + OrderStr + " LIMIT " + ((PageIndex - 1) * PageSize).ToString() + "," + PageSize.ToString(); string countText = @"SELECT count(*) FROM " + TableName + " " + _Where; DataSet retSet = new DataSet(); using (MySqlDataAdapter msda = new MySqlDataAdapter(selectText, connectionString)) { msda.Fill(retSet); } object objCount = ExecuteScalar(connectionString, CommandType.Text, countText, null); RecordCount = 0; PageCount = 1; if (objCount != null && objCount != DBNull.Value) { RecordCount = Convert.ToInt32(objCount); PageCount = (RecordCount / PageSize) + ((RecordCount % PageSize) > 0 ? 1 : 0); } if (retSet != null && retSet.Tables.Count > 0) { return retSet.Tables[0]; } return null; } /// <summary> /// 分页获得数据 /// </summary> /// <param name="PageIndex">页码</param> /// <param name="PageSize">每页显示数据量</param> /// <param name="TableName">表名，可以是自定义查询集合</param> /// <param name="Fields">字段名</param> /// <param name="_Where">条件语句，需要以where开头</param> /// <param name="OrderStr">排序语句</param> /// <param name="RecordCount">记录数 输出参数</param> /// <param name="PageCount">总页数 输出参数</param> /// <returns></returns> public static DataTable GetDataTableByPage(string connectionString, int PageIndex, int PageSize, string TableName, string Fields, string _Where, string OrderStr, out int RecordCount, out int PageCount) { string selectText = @"SELECT " + Fields + " FROM " + TableName + " " + _Where + " " + OrderStr + " LIMIT " + ((PageIndex - 1) * PageSize).ToString() + "," + PageSize.ToString(); string countText = @"SELECT COUNT(*) FROM " + TableName + " " + _Where; DataSet retSet = new DataSet(); using (MySqlDataAdapter msda = new MySqlDataAdapter(selectText, connectionString)) { msda.Fill(retSet); } object objCount = ExecuteScalar(connectionString, CommandType.Text, countText, null); RecordCount = 0; PageCount = 1; if (objCount != null && objCount != DBNull.Value) { RecordCount = Convert.ToInt32(objCount); PageCount = (RecordCount / PageSize) + ((RecordCount % PageSize) > 0 ? 1 : 0); } if (retSet != null && retSet.Tables.Count > 0) { return retSet.Tables[0]; } return null; } } }
需要下载一个MySql.Data.dll文件
下载地址：http://pan.baidu.com/s/1b9f2Qq
连接字符串格式：<add name="MySQLConnString" connectionString="server=******; user id=******j; password=******; database=******"/>
注意：connectionString 不是 Data Source了，是server。
以上是关于MySqlDBHelper的主要内容，如果未能解决你的问题，请参考以下文章