<一>
using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Xml.Linq;
using System.Data.SqlClient;
/// <summary>
///SqlHelper 的摘要说明
/// </summary>
public class SqlHelper
{
private SqlConnection conn = null;
private SqlCommand cmd = new SqlCommand();
private SqlDataReader sdr = null;
//实例化conn
public SqlHelper()
{
string str = ConfigurationManager.ConnectionStrings["sqlconnectionStr"].ConnectionString;
conn = new SqlConnection(str);
}
//打开连接
private SqlConnection GetConn()
{
if (conn.State == ConnectionState.Closed)
{
conn.Open();
}
return conn;
}
/// <summary>
/// 执行不带参数的查询语句,可以是text或者存储过程
/// </summary>
/// <param name="sql">可以是sql也可以是存储过程名</param>
/// <param name="ct">sql还是存储过程</param>
/// <returns>datatable</returns>
public DataTable ExecuteQuery(string cmdtext, CommandType ct)
{
DataTable dt = new DataTable();
cmd = new SqlCommand(cmdtext, GetConn());
cmd.CommandType = ct;
using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))//当sdr释放时跟他相关的如dataset.conn等同时也关闭，那就不用try catsh了
{
dt.Load(sdr);//将读取到的sdr填充到dt中
}
return dt;
}
/// <summary>
/// 执行带参数的增删改sql语句
/// </summary>
/// <param name="cmdtext">sql语句或者存储过程名</param>
/// <param name="psras">实体类，或者参数字段</param>
/// <param name="ct">命令参数类型text or 存储过程</param>
/// <returns>返回int</returns>
public int ExecuteNonQuery(string cmdtext, SqlParameter[] psras, CommandType ct)//传入数组
{
int res;
using (cmd = new SqlCommand(cmdtext, GetConn()))
{
cmd.CommandType = ct;
cmd.Parameters.AddRange(psras);//addranges可以传入一个数组！
res = cmd.ExecuteNonQuery();
}
return res;
}
/// <summary>
/// 执行带参数的sql查询语句，返回datatable
/// </summary>
/// <param name="cmdttext">sql语句或者存储过程名</param>
/// <param name="psras">实体类名或者参数字段</param>
/// <param name="ct">text类型或者存储过程</param>
/// <returns>datatable</returns>
public DataTable ExecuteQuery(string cmdText, SqlParameter[] paras, CommandType ct)
{
DataTable dt = new DataTable();
cmd = new SqlCommand(cmdText, GetConn());
cmd.CommandType = ct;
cmd.Parameters.AddRange(paras);
using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
dt.Load(sdr);
}
return dt;
}
/// <summary>
/// 查询数据库中是否存在
/// </summary>
/// <param name="cmdtext">sql查询语句</param>
/// <param name="psras">数组</param>
/// <param name="ct">文本或者存储过程</param>
/// <returns>返回int</returns>
public int ExecuteScalar(string cmdtext, SqlParameter[] psras, CommandType ct)//传入数组
{
int res;
using (cmd = new SqlCommand(cmdtext, GetConn()))
{
cmd.CommandType = ct;
cmd.Parameters.AddRange(psras);//addranges可以传入一个数组！
sdr = cmd.ExecuteReader();
if (sdr.Read())
{
res = 1;
}
else { res = 0; }
}
sdr.Close();
return res;
}
/// <summary>
/// 执行无参数的sql语句或者存储过程 返回总数
/// </summary>
/// <param name="cmdtext1"></param>
/// <param name="psras"></param>
/// <param name="ct"></param>
/// <returns></returns>
public int ExecuteScalar(string cmdtext, CommandType ct)//传入数组
{
int res;
using (cmd = new SqlCommand(cmdtext, GetConn()))
{
cmd.CommandType = ct;
res= int.Parse(cmd.ExecuteScalar().ToString());
}
return res;
}
/// <summary>
/// 执行带参数的sql语句或者存储过程 返回总数 int类型
/// </summary>
/// <param name="cmdtext1"></param>
/// <param name="psras"></param>
/// <param name="ct"></param>
/// <returns></returns>
public int ExecuteScalarr(string cmdtext, SqlParameter[] psras, CommandType ct)//传入数组
{
int res;
using (cmd = new SqlCommand(cmdtext, GetConn()))
{
cmd.CommandType = ct;
cmd.Parameters.AddRange(psras);//addranges可以传入一个数组！
res = int.Parse(cmd.ExecuteScalar().ToString());
}
return res;
}
/// <summary>
/// 执行带参数 没有返回类型、值的SQL或者存储过后
/// </summary>
/// <param name="cmdtext"></param>
/// <param name="ct"></param>
/// <returns></returns>
public void ExecuteSca(string cmdtext, SqlParameter[] psras, CommandType ct)
{
using (cmd = new SqlCommand(cmdtext, GetConn()))
{
cmd.CommandType = ct;
cmd.Parameters.AddRange(psras);
cmd.ExecuteScalar();
}
}
/// <summary>
/// 执无参数 没有返回类型、值的SQL或者存储过后
/// </summary>
/// <param name="cmdtext"></param>
/// <param name="ct"></param>
public void ExecuteSca(string cmdtext, CommandType ct)
{
using (cmd = new SqlCommand(cmdtext, GetConn()))
{
cmd.CommandType = ct;
cmd.ExecuteScalar();
}
}
}
webconfig：
<connectionStrings>
<add name="sqlconnectionStr" connectionString="Data Source=172.16.128.38;database=mydata;user=sa;password=sa" providerName="System.Data.SqlClient"/>
</connectionStrings>
<二>
using System;
using System.Collections;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.IO;
using System.Xml;
namespace DAL
{
public class SQLHelper
{
//数据连接字符串
public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;
// 哈希表来存储缓存参数
private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
using (SqlConnection conn = new SqlConnection(connectionString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
}
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;
}
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 SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
SqlConnection conn = new SqlConnection(connectionString);
try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return rdr;
}
catch
{
conn.Close();
throw;
}
}
public static DataTable ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();
SqlConnection conn = new SqlConnection(connectionString);
try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
DataSet ds = new DataSet();
SqlDataAdapter sqlAdapter = new SqlDataAdapter(cmd);
sqlAdapter.Fill(ds);
return ds.Tables[0];
}
catch
{
conn.Close();
throw;
}
}
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;
}
}
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;
}
public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
{
parmCache[cacheKey] = commandParameters;
}
public static SqlParameter[] GetCachedParameters(string cacheKey)
{
SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];
if (cachedParms == null)
return null;
SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];
for (int i = 0, j = cachedParms.Length; i < j; i++)
clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();
return clonedParms;
}
private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] 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 (SqlParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
public static DataTable ExecuteXmlSet(string filename)
{
StreamReader tyj = new StreamReader(filename);
XmlDataDocument datadoc = new XmlDataDocument();
datadoc.DataSet.ReadXml(tyj);
return datadoc.DataSet.Tables[0];
}
}
}
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