using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Collections;
using System.Data.SqlClient;
using System.Collections.Generic;namespace DBUtility
{ /// <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
{
///SQL Server数据库的连接字符串
public static readonly string ConnStr = ConfigurationManager.ConnectionStrings["sqlCon"].ConnectionString;
//哈希表用来储存缓存的参数,它可以储存任何的类型参数
private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
/// <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>
/// <res>
/// 使用示例:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
public static int ExecuteNonQuery(string connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand();
using (SqlConnection conn = new SqlConnection(connString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
}
public static int ExecuteNonQuery(SqlConnection conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand(); PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
public static SqlDataReader ExecuteReader(string connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand();
SqlConnection conn = new SqlConnection(connString);
// 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, cmdParms);
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return reader;
}
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>
/// <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 connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand();
using (SqlConnection conn = new SqlConnection(connString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
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>
public static object ExecuteScalar(SqlConnection conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{ SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
//// <summary>
/// 返回数据集集合,可返回多个表,通过专用的连接字符串
/// </summary>
public static DataSet GetDataSet(string connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd=new SqlCommand();
using(SqlConnection conn = new SqlConnection(connString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = cmd;
DataSet ds=new DataSet();
adapter.Fill(ds);
cmd.Parameters.Clear();
return ds;
}
}
///<summary>
/// 返回数据集集合,可返回多个表,通过已经存在的数据库连接
/// </summary>
public static DataSet GetDataSet(SqlConnection conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = cmd;
DataSet ds = new DataSet();
adapter.Fill(ds);
cmd.Parameters.Clear();
return ds;
}
/// <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[] cmdParms)
{
parmCache[cacheKey] = cmdParms;
}
/// <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).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 text,T-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)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.CommandText = cmdText;
cmd.Connection = conn;
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = cmdType;
if (cmdParms != null)
{
foreach (SqlParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
}
}
using System.Data;
using System.Configuration;
using System.Web;
using System.Collections;
using System.Data.SqlClient;
using System.Collections.Generic;namespace DBUtility
{ /// <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
{
///SQL Server数据库的连接字符串
public static readonly string ConnStr = ConfigurationManager.ConnectionStrings["sqlCon"].ConnectionString;
//哈希表用来储存缓存的参数,它可以储存任何的类型参数
private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
/// <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>
/// <res>
/// 使用示例:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
public static int ExecuteNonQuery(string connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand();
using (SqlConnection conn = new SqlConnection(connString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
}
public static int ExecuteNonQuery(SqlConnection conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand(); PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
public static SqlDataReader ExecuteReader(string connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand();
SqlConnection conn = new SqlConnection(connString);
// 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, cmdParms);
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return reader;
}
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>
/// <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 connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand();
using (SqlConnection conn = new SqlConnection(connString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
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>
public static object ExecuteScalar(SqlConnection conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{ SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
//// <summary>
/// 返回数据集集合,可返回多个表,通过专用的连接字符串
/// </summary>
public static DataSet GetDataSet(string connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd=new SqlCommand();
using(SqlConnection conn = new SqlConnection(connString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = cmd;
DataSet ds=new DataSet();
adapter.Fill(ds);
cmd.Parameters.Clear();
return ds;
}
}
///<summary>
/// 返回数据集集合,可返回多个表,通过已经存在的数据库连接
/// </summary>
public static DataSet GetDataSet(SqlConnection conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = cmd;
DataSet ds = new DataSet();
adapter.Fill(ds);
cmd.Parameters.Clear();
return ds;
}
/// <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[] cmdParms)
{
parmCache[cacheKey] = cmdParms;
}
/// <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).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 text,T-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)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.CommandText = cmdText;
cmd.Connection = conn;
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = cmdType;
if (cmdParms != null)
{
foreach (SqlParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
}
}
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第二,你引用了system.configuration这个动态库了么?
他是Configuration 命名空间下的
选中项目 -> 点击右键 -> 选择"添加引用" -> 从框中找到"System.Configuration"