DS7/WebSqlHelper/SqlHelper.cs

666 lines
30 KiB
C#

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using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Collections;
using System.Configuration;
namespace WebSqlHelper
{
/// <summary>
/// 数据库的通用访问代码
/// 此类为抽象类,不允许实例化,在应用时直接调用即可
/// </summary>
public abstract class SqlHelper
{
//获取数据库连接字符串,其属于静态变量且只读,项目中所有文档可以直接使用,但不能修改
public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings["DongShengDB"].ConnectionString;
//public static readonly string ConnectionStringInventoryDistributedTransaction = ConfigurationManager.ConnectionStrings["SQLConnString2"].ConnectionString;
//public static readonly string ConnectionStringOrderDistributedTransaction = ConfigurationManager.ConnectionStrings["SQLConnString3"].ConnectionString;
//public static readonly string ConnectionStringProfile = ConfigurationManager.ConnectionStrings["SQLProfileConnString"].ConnectionString;
// public static readonly string ConnectionStringPrint = ConfigurationManager.ConnectionStrings["DongShengPR"].ConnectionString;
// 哈希表用来存储缓存的参数信息,哈希表可以存储任意类型的参数。
private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
private static SqlConnection _sqlConnection;
/// <summary>
///执行一个不需要返回值的SqlCommand命令通过指定专用的连接字符串。
/// 使用参数数组形式提供参数列表
/// </summary>
/// <remarks>
/// 使用示例:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="commandType">SqlCommand命令类型 (存储过程, T-SQL语句 等等。)</param>
/// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
/// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText)
{
SqlCommand cmd = new SqlCommand();
using (SqlConnection conn = new SqlConnection(connectionString))
{
//通过PrePareCommand方法将参数逐个加入到SqlCommand的参数集合中
PrepareCommand(cmd, conn, null, cmdType, cmdText);
int val = cmd.ExecuteNonQuery();
return val;
}
}
/// <summary>
///执行一个不需要返回值的SqlCommand命令通过指定专用的连接字符串。
/// 使用参数数组形式提供参数列表
/// </summary>
/// <remarks>
/// 使用示例:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="commandType">SqlCommand命令类型 (存储过程, T-SQL语句 等等。)</param>
/// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
/// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
using (SqlConnection conn = new SqlConnection(connectionString))
{
//通过PrePareCommand方法将参数逐个加入到SqlCommand的参数集合中
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
//清空SqlCommand中的参数列表
cmd.Parameters.Clear();
return val;
}
}
/// <summary>
///执行一条不返回结果的SqlCommand通过一个已经存在的数据库连接
/// 使用参数数组提供参数
/// </summary>
/// <remarks>
/// 使用示例:
/// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="conn">一个现有的数据库连接</param>
/// <param name="commandType">SqlCommand命令类型 (存储过程, T-SQL语句 等等。)</param>
/// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
/// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
/// <summary>
/// 执行一条不返回结果的SqlCommand通过一个已经存在的数据库事物处理
/// 使用参数数组提供参数
/// </summary>
/// <remarks>
/// 使用示例:
/// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="trans">一个存在的 sql 事物处理</param>
/// <param name="commandType">SqlCommand命令类型 (存储过程, T-SQL语句 等等。)</param>
/// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
/// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText);
int val = cmd.ExecuteNonQuery();
return val;
}
/// <summary>
/// 执行一条返回结果集的SqlCommand命令通过专用的连接字符串。
/// 使用参数数组提供参数
/// </summary>
/// <remarks>
/// 使用示例:
/// SqlDataReader r = ExecuteReader(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="commandType">SqlCommand命令类型 (存储过程, T-SQL语句 等等。)</param>
/// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
/// <returns>返回一个包含结果的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
SqlConnection conn = new SqlConnection(connectionString);
// 在这里使用try/catch处理是因为如果方法出现异常则SqlDataReader就不存在
//CommandBehavior.CloseConnection的语句就不会执行触发的异常由catch捕获。
//关闭数据库连接并通过throw再次引发捕捉到的异常。
try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return rdr;
}
catch
{
conn.Close();
throw;
}
}
/// <summary>
/// 执行一条返回第一条记录第一列的SqlCommand命令通过专用的连接字符串。
/// 使用参数数组提供参数
/// </summary>
/// <remarks>
/// 使用示例:
/// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">一个有效的数据库连接字符串</param>
/// <param name="commandType">SqlCommand命令类型 (存储过程, T-SQL语句 等等。)</param>
/// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
/// <returns>返回一个object类型的数据可以通过 Convert.To{Type}方法转换类型</returns>
public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
using (SqlConnection connection = new SqlConnection(connectionString))
{
PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
}
/// <summary>
/// 执行一条返回第一条记录第一列的SqlCommand命令通过已经存在的数据库连接。
/// 使用参数数组提供参数
/// </summary>
/// <remarks>
/// 使用示例:
/// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="conn">一个已经存在的数据库连接</param>
/// <param name="commandType">SqlCommand命令类型 (存储过程, T-SQL语句 等等。)</param>
/// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
/// <returns>返回一个object类型的数据可以通过 Convert.To{Type}方法转换类型</returns>
public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
/// <summary>
/// 执行一条返回第一条记录第一列的SqlCommand命令通过已经存在的数据库连接。(事务操作)
/// 使用参数数组提供参数
/// </summary>
/// <remarks>
/// 使用示例:
/// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="trans">一个存在的 sql 事物处理</param>
/// <param name="commandType">SqlCommand命令类型 (存储过程, T-SQL语句 等等。)</param>
/// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
/// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
public static object ExecuteScalar(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
/// <summary>
/// 缓存参数数组
/// </summary>
/// <param name="cacheKey">参数缓存的键值</param>
/// <param name="cmdParms">被缓存的参数列表</param>
public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
{
parmCache[cacheKey] = commandParameters;
}
/// <summary>
/// 获取被缓存的参数
/// </summary>
/// <param name="cacheKey">用于查找参数的KEY值</param>
/// <returns>返回缓存的参数数组</returns>
public static SqlParameter[] GetCachedParameters(string cacheKey)
{
SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];
if (cachedParms == null)
return null;
//新建一个参数的克隆列表
SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];
//通过循环为克隆参数列表赋值
for (int i = 0, j = cachedParms.Length; i < j; i++)
//使用clone方法复制参数列表中的参数
clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();
return clonedParms;
}
/// <summary>
/// 为执行命令准备参数
/// </summary>
/// <param name="cmd">SqlCommand 命令</param>
/// <param name="conn">已经存在的数据库连接</param>
/// <param name="trans">数据库事物处理</param>
/// <param name="cmdType">SqlCommand命令类型 (存储过程, T-SQL语句 等等。)</param>
/// <param name="cmdText">Command textT-SQL语句 例如 Select * from Products</param>
/// <param name="cmdParms">返回带参数的命令</param>
private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText)
{
//判断数据库连接状态
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
//判断是否需要事物处理
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = cmdType;
}
/// <summary>
/// 为执行命令准备参数
/// </summary>
/// <param name="cmd">SqlCommand 命令</param>
/// <param name="conn">已经存在的数据库连接</param>
/// <param name="trans">数据库事物处理</param>
/// <param name="cmdType">SqlCommand命令类型 (存储过程, T-SQL语句 等等。)</param>
/// <param name="cmdText">Command textT-SQL语句 例如 Select * from Products</param>
/// <param name="cmdParms">返回带参数的命令</param>
private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
{
//判断数据库连接状态
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
//判断是否需要事物处理
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = cmdType;
if (cmdParms != null)
{
foreach (SqlParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
/// <summary>
/// 事务操作 ADD 2011-4-2 JHQ
/// </summary>
/// <param name="con"></param>
/// <returns></returns>
public static SqlTransaction BeginTransaction(string con)
{
//SqlConnection connection = new SqlConnection(con);
_sqlConnection = new SqlConnection(con);
_sqlConnection.Open();
SqlTransaction tran = _sqlConnection.BeginTransaction();
return tran;
}
#region z
/// <summary>
/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in
/// the connection string.
/// </summary>
/// <remarks>
/// e.g.:
/// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connectionString">A valid connection string for a SqlConnection</param>
/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">The stored procedure name or T-SQL command</param>
/// <returns>A dataset containing the resultset generated by the command</returns>
public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
{
DataSet ds = null;
bool mustCloseConnection = false;
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
SqlCommand command = null;
using (SqlConnection connection = new SqlConnection(connectionString))
{
if (connection.State != ConnectionState.Open)
{
mustCloseConnection = true;
connection.Open();
}
else
{
mustCloseConnection = false;
}
command = new SqlCommand();
// Associate the connection with the command
command.Connection = connection;
// Set the command text (stored procedure name or SQL statement)
command.CommandText = commandText;
using (SqlDataAdapter da = new SqlDataAdapter(command))
{
ds = new DataSet();
// Fill the DataSet using default values for DataTable names, etc
da.Fill(ds);
// Detach the SqlParameters from the command object, so they can be used again
command.Parameters.Clear();
if (mustCloseConnection)
connection.Close();
}
}
return ds;
}
#endregion
#region z
/// <summary>
/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in
/// the connection string.
/// </summary>
/// <remarks>
/// e.g.:
/// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connectionString">A valid connection string for a SqlConnection</param>
/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
/// <param name="commandText">The stored procedure name or T-SQL command</param>
/// <returns>A dataset containing the resultset generated by the command</returns>
public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
DataSet ds = null;
bool mustCloseConnection = false;
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
SqlCommand command = null;
using (SqlConnection connection = new SqlConnection(connectionString))
{
if (connection.State != ConnectionState.Open)
{
mustCloseConnection = true;
connection.Open();
}
else
{
mustCloseConnection = false;
}
command = new SqlCommand();
// Associate the connection with the command
command.Connection = connection;
// Set the command text (stored procedure name or SQL statement)
command.CommandText = commandText;
//通过PrePareCommand方法将参数逐个加入到SqlCommand的参数集合中
PrepareCommand(command, connection, null, commandType, commandText, commandParameters);
using (SqlDataAdapter da = new SqlDataAdapter(command))
{
ds = new DataSet();
// Fill the DataSet using default values for DataTable names, etc
da.Fill(ds);
// Detach the SqlParameters from the command object, so they can be used again
command.Parameters.Clear();
if (mustCloseConnection)
connection.Close();
}
}
return ds;
}
#endregion
public static void CloseConnection()
{
if (_sqlConnection != null)
{
if (_sqlConnection.State == ConnectionState.Open)
{
_sqlConnection.Close();
}
}
}
/// <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 GetSingle(string connectionString, string SQLString)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand(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 (System.Data.SqlClient.SqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// <summary>
/// 执行存储过程
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <param name="tableName">DataSet结果中的表名</param>
/// <returns>DataSet</returns>
public static DataSet RunProcedure(string connectionString, string storedProcName, IDataParameter[] parameters, string tableName)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
}
/// <summary>
/// 构建 SqlCommand 对象(用来返回一个结果集,而不是一个整数值)
/// </summary>
/// <param name="connection">数据库连接</param>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>SqlCommand</returns>
private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
{
SqlCommand command = new SqlCommand(storedProcName, connection);
command.CommandType = CommandType.StoredProcedure;
foreach (SqlParameter parameter in parameters)
{
if (parameter != null)
{
// 检查未分配值的输出参数,将其分配以DBNull.Value.
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
command.Parameters.Add(parameter);
}
}
return command;
}
/// <summary>
/// 返回查询结果集 LWP 2012-10-10
/// </summary>
/// <param name="strSql">Sql语句</param>
/// <param name="commandParameters">存储过程参数</param>
/// <returns>结果集</returns>
public static DataSet Query(string strSql, params SqlParameter[] commandParameters)
{
return ExecuteDataset(ConnectionStringLocalTransaction, CommandType.Text, strSql, commandParameters);
}
#region ExecuteDataset
/// <summary>
/// 返回查询结果集
/// </summary>
/// <param name="cmdText">Sql语句</param>
/// <returns></returns>
public static DataSet ExecuteDataset(string cmdText)
{
return ExecuteDataset(ConnectionStringLocalTransaction, CommandType.Text, cmdText);
}
#endregion
//-------------------------------------------------------------------------------------------------------------------------------
/// <summary>
/// 直接执行语句返回数据集
/// </summary>
/// <param name="connectionstring">数据库连接字符串</param>
/// <param name="sqltext">查询语句</param>
/// <returns></returns>
public static DataSet OpenSqlDataSet(string connectionstring, string sqltext)
{
SqlConnection Conn = new SqlConnection(connectionstring);
// Conn.ConnectionTimeout=600;
Conn.Open();
SqlDataAdapter MyAdapter = new SqlDataAdapter(sqltext, Conn);
DataSet MyDataSet = new DataSet();
try
{
MyAdapter.SelectCommand.CommandTimeout = 6000;
MyAdapter.Fill(MyDataSet);
Conn.Close();
}
catch
{
MyDataSet = null;
Conn.Close();
}
return MyDataSet;
}
/// <summary>
/// 直接执行语句返回执行结果true/false
/// </summary>
/// <param name="connectionstring">数据库连接字符串</param>
/// <param name="sqltext">执行语句</param>
/// <returns></returns>
public static bool ExecuteSqlCommand(string connectionstring, string sqltext)
{
bool bRtn;
try
{
SqlConnection Conn = new SqlConnection(connectionstring);
Conn.Open();
SqlTransaction myTrans = Conn.BeginTransaction();
SqlCommand MyCommand = new SqlCommand(sqltext, Conn, myTrans);
MyCommand.CommandTimeout = 6000;
try
{
MyCommand.ExecuteNonQuery();
myTrans.Commit();
Conn.Close();
bRtn = true;
}
catch
{
myTrans.Rollback();
bRtn = false;
}
}
catch { bRtn = false; }
return bRtn;
}
/// <summary>
/// 执行一条不返回结果的SqlCommand通过一个已经存在的数据库事物处理
/// 使用参数数组提供参数
/// </summary>
/// <remarks>
/// 使用示例:
/// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="trans">一个存在的 sql 事物处理</param>
/// <param name="commandType">SqlCommand命令类型 (存储过程, T-SQL语句 等等。)</param>
/// <param name="commandText">存储过程的名字或者 T-SQL 语句</param>
/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>
/// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>
public static DataSet ExecuteQueryDataset(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
DataSet ds = null;
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters);
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
ds = new DataSet();
// Fill the DataSet using default values for DataTable names, etc
da.Fill(ds);
// Detach the SqlParameters from the command object, so they can be used again
cmd.Parameters.Clear();
}
return ds;
}
//
}
}