MysqlHelper.cs
/********************************************
* MySql数据库接口
* 2011-4-10
*******************************************/
using System;
using System.Data;
using MySql.Data.MySqlClient;
namespace AllBase
{
public class MysqlHelper
{
/// <summary>
/// 数据库连接串
/// </summary>
private string ConnString = "";
/// <summary>
/// 数据库连接
/// </summary>
private MySqlConnection Conn;
/// <summary>
/// 数据库连接
/// </summary>
private MySqlDataReader reader;
/// <summary>
/// 错误信息
/// </summary>
public static string ErrorString = "";
/// <summary>
/// 超时（秒）
/// </summary>
public int TimeOut = 100;
/// <summary>
/// 初始化数据库链接
/// </summary>
/// <param name="connString">数据库链接</param>
public MysqlHelper(string connString)
{
ConnString = connString;
ConnTo();
}
/// <summary>
/// 去掉SQL中的特殊字符
/// </summary>
/// <param name="value">字符串</param>
/// <returns></returns>
public string ReplaceSql(string value)
{
if (string.IsNullOrEmpty(value))
return null;
value = value.Replace("\\", "\\\\");
value = value.Replace("'", "''");
value = value.Replace("\"", "\\\"");
value = value.Replace("%", "\\%");
return value;
}
public DataTable ExecuteDataTable(string SqlString)
{
return ExecuteDataTable(SqlString, null);
}
/// <summary>
/// 执行sql返回DataTable
/// </summary>
/// <param name="SqlString">SQL语句</param>
/// <param name="parms">Sql参数</param>
/// <returns>DataTable</returns>
public DataTable ExecuteDataTable(string SqlString, MySqlParameter[] parms)
{
if (Conn == null || Conn.State != ConnectionState.Open)
ConnTo();
try
{
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = Conn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = SqlString;
cmd.CommandTimeout = TimeOut;
if (parms != null)
foreach (MySqlParameter pram in parms)
cmd.Parameters.Add(pram);
DataTable dt = new DataTable();
try
{
if (reader != null && !reader.IsClosed)
reader.Close();
reader = cmd.ExecuteReader();
dt.Load(reader);
}
catch
{
if (reader != null && !reader.IsClosed)
reader.Close();
reader = cmd.ExecuteReader();
dt = Read(ref reader);
}
return dt;
}
catch (Exception e)
{
AddError(e.Message, SqlString);
return null;
}
finally
{
if (reader != null && !reader.IsClosed)
reader.Close();
}
}
/// <summary>
/// 读取所有数据
/// </summary>
/// <param name="reader"></param>
/// <returns></returns>
private DataTable Read(ref MySqlDataReader reader)
{
DataTable dt = new DataTable();
bool frist = true;
while (reader.Read())
{
if (frist)
{
for (int i = 0; i < reader.FieldCount; i++)
{
string s = reader.GetName(i);
//var type = reader[0].GetType();
dt.Columns.Add(s, Type.GetType("System.String"));
}
frist = false;
}
DataRow dr = dt.NewRow();
for (int i = 0; i < reader.FieldCount; i++)
dr[i] = reader.GetString(i);
dt.Rows.Add(dr);
}
return dt;
}
public DataRow ExecuteDataTableRow(string SqlString)
{
return ExecuteDataTableRow(SqlString, null);
}
/// <summary>
/// 返回第一行
/// </summary>
/// <param name="SqlString"></param>
/// <returns></returns>
public DataRow ExecuteDataTableRow(string SqlString, MySqlParameter[] parms)
{
if (Conn == null || Conn.State != ConnectionState.Open)
ConnTo();
try
{
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = Conn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = SqlString;
cmd.CommandTimeout = TimeOut;
if (parms != null)
foreach (MySqlParameter pram in parms)
cmd.Parameters.Add(pram);
DataTable dt = new DataTable();
try
{
if (reader != null && !reader.IsClosed)
reader.Close();
reader = cmd.ExecuteReader();
dt.Load(reader);
}
catch
{
if (reader != null && !reader.IsClosed)
reader.Close();
reader = cmd.ExecuteReader();
dt = Read(ref reader);
}
if (dt.Rows.Count > 0)
return dt.Rows[0];
}
catch (Exception e)
{
AddError(e.Message, SqlString);
}
finally
{
if (reader != null && !reader.IsClosed)
reader.Close();
}
return null;
}
public string ExecuteFirst(string SqlString)
{
return ExecuteFirst(SqlString, null);
}
/// <summary>
/// 返回第一个值
/// </summary>
/// <param name="SqlString"></param>
/// <returns></returns>
public string ExecuteFirst(string SqlString, MySqlParameter[] parms)
{
if (Conn == null || Conn.State != ConnectionState.Open)
ConnTo();
try
{
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = Conn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = SqlString;
cmd.CommandTimeout = TimeOut;
if (parms != null)
foreach (MySqlParameter pram in parms)
cmd.Parameters.Add(pram);
if (reader != null && !reader.IsClosed)
reader.Close();
reader = cmd.ExecuteReader();
string xx = "";
if (reader.Read())
xx = reader[0].ToString();
return xx;
}
catch (Exception e)
{
AddError(e.Message, SqlString);
}
finally
{
if (reader != null && !reader.IsClosed)
reader.Close();
}
return null;
}
public long ExecuteInsertId(string SqlString)
{
return ExecuteInsertId(SqlString, null);
}
/// <summary>
/// 返回第一个值
/// </summary>
/// <param name="SqlString"></param>
/// <returns></returns>
public long ExecuteInsertId(string SqlString, MySqlParameter[] parms)
{
if (Conn == null || Conn.State != ConnectionState.Open)
ConnTo();
try
{
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = Conn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = SqlString;
cmd.CommandTimeout = TimeOut;
if (parms != null)
foreach (MySqlParameter pram in parms)
cmd.Parameters.Add(pram);
cmd.ExecuteNonQuery();
return cmd.LastInsertedId;
}
catch (Exception e)
{
AddError(e.Message, SqlString);
}
return 0;
}
public bool ExecuteNonQuery(string SqlString)
{
return ExecuteNonQuery(SqlString, null);
}
/// <summary>
/// 执行无返回SQL语句
/// </summary>
/// <param name="SqlString">SQL语句</param>
/// <param name="parms">Sql参数</param>
///<returns>是否执行成功</returns>
public bool ExecuteNonQuery(string SqlString, MySqlParameter[] parms)
{
if (Conn == null || Conn.State != ConnectionState.Open)
ConnTo();
try
{
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = Conn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = SqlString;
cmd.CommandTimeout = TimeOut;
if (parms != null)
foreach (MySqlParameter pram in parms)
cmd.Parameters.Add(pram);
cmd.ExecuteNonQuery();
return true;
}
catch (Exception e)
{
AddError(e.Message, SqlString);
return false;
}
}
public bool ExecuteExists(string SqlString)
{
return ExecuteExists(SqlString, null);
}
/// <summary>
/// 查询是否存在
/// </summary>
/// <param name="SqlString">SQL语句</param>
/// <param name="parms">SQL参数</param>
/// <returns>是否存在</returns>
public bool ExecuteExists(string SqlString, MySqlParameter[] parms)
{
if (Conn == null || Conn.State != ConnectionState.Open)
ConnTo();
try
{
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = Conn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = SqlString;
cmd.CommandTimeout = TimeOut;
if (parms != null)
foreach (MySqlParameter pram in parms)
cmd.Parameters.Add(pram);
if (reader != null && !reader.IsClosed)
reader.Close();
reader = cmd.ExecuteReader();
if (reader.Read())
return true;
return false;
}
catch (Exception e)
{
AddError(e.Message, SqlString);
return false;
}
finally
{
if (reader != null && !reader.IsClosed)
reader.Close();
}
}
/// <summary>
/// 连接数据库
/// </summary>
private void ConnTo()
{
Close();
try
{
Conn = new MySqlConnection(ConnString);
Conn.Open();
}
catch (Exception e)
{
AddError(e.Message, ConnString);
}
}
/// <summary>
/// 错误信息
/// </summary>
/// <param name="message"></param>
/// <param name="sql"></param>
private void AddError(string message, string sql)
{
ErrorString += "数据库连接错误：" + message + "\r\nSQL语句：" + sql + "\r\n";
if (!string.IsNullOrEmpty(ErrorString) && ErrorString.Length > 1000)
ErrorString = "";
}
/// <summary>
/// 关闭数据库链接
/// </summary>
public void Close()
{
if (Conn != null && Conn.State == ConnectionState.Open)
{
Conn.Close();
Conn = null;
}
else
Conn = null;
GC.Collect();
//try
//{
// Conn.Close();
// Conn = null;
//}
//catch
//{
//}
}
}
}
SqlServerHelper.cs
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Data.Common;
using System.Collections.Generic;
namespace AKE.PDDMS.DAL
{
public abstract class SQLHelper
{
//数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.
public static string connectionString = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
public SQLHelper()
{
}
#region 公用方法
/// <summary>
/// 判断是否存在某表的某个字段
/// </summary>
/// <param name="tableName">表名称</param>
/// <param name="columnName">列名称</param>
/// <returns>是否存在</returns>
public static bool ColumnExists(string tableName, string columnName)
{
string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'";
object res = GetSingle(sql);
if (res == null)
{
return false;
}
return Convert.ToInt32(res) > 0;
}
public static int GetMaxID(string FieldName, string TableName)
{
string strsql = "select max(" + FieldName + ")+1 from " + TableName;
object obj = GetSingle(strsql);
if (obj == null)
{
return 1;
}
else
{
return int.Parse(obj.ToString());
}
}
public static bool Exists(string strSql)
{
object obj = GetSingle(strSql);
int cmdresult;
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
cmdresult = 0;
}
else
{
cmdresult = int.Parse(obj.ToString());
}
if (cmdresult == 0)
{
return false;
}
else
{
return true;
}
}
/// <summary>
/// 表是否存在
/// </summary>
/// <param name="TableName"></param>
/// <returns></returns>
public static bool TabExists(string TableName)
{
string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1";
//string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[" + TableName + "]') AND type in (N'U')";
object obj = GetSingle(strsql);
int cmdresult;
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
cmdresult = 0;
}
else
{
cmdresult = int.Parse(obj.ToString());
}
if (cmdresult == 0)
{
return false;
}
else
{
return true;
}
}
public static bool Exists(string strSql, params SqlParameter[] cmdParms)
{
object obj = GetSingle(strSql, cmdParms);
int cmdresult;
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
cmdresult = 0;
}
else
{
cmdresult = int.Parse(obj.ToString());
}
if (cmdresult == 0)
{
return false;
}
else
{
return true;
}
}
#endregion
#region 执行简单SQL语句
/// <summary>
/// 执行SQL语句，返回影响的记录数
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSql(string SQLString)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
connection.Close();
throw e;
}
}
}
}
public static int ExecuteSqlByTime(string SQLString, int Times)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
cmd.CommandTimeout = Times;
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
connection.Close();
throw e;
}
}
}
}
/// <summary>
/// 执行多条SQL语句，实现数据库事务。
/// </summary>
/// <param name="SQLStringList">多条SQL语句</param>
public static int ExecuteSqlTran(List<String> SQLStringList)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
SqlTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
{
int count = 0;
for (int n = 0; n < SQLStringList.Count; n++)
{
string strsql = SQLStringList[n];
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
count += cmd.ExecuteNonQuery();
}
}
tx.Commit();
return count;
}
catch
{
tx.Rollback();
return 0;
}
}
}
/// <summary>
/// 执行带一个存储过程参数的的SQL语句。
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSql(string SQLString, string content)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(SQLString, connection);
System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <summary>
/// 执行带一个存储过程参数的的SQL语句。
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
/// <returns>影响的记录数</returns>
public static object ExecuteSqlGet(string SQLString, string content)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(SQLString, connection);
System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
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)
{
throw e;
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <summary>
/// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
/// </summary>
/// <param name="strSQL">SQL语句</param>
/// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(strSQL, connection);
System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Image);
myParameter.Value = fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
connection.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 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;
}
}
}
}
public static object GetSingle(string SQLString, int Times)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
cmd.CommandTimeout = Times;
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;
}
}
}
}
//public static object GetSingle(string SQLString, SqlParameter[] cmdParms)
//{
// using (SqlConnection connection = new SqlConnection(connectionString))
// {
// using (SqlCommand cmd = new SqlCommand(SQLString, connection))
// {
// try
// {
// connection.Open();
// PrepareCommand(cmd, connection, null, SQLString, cmdParms);
// //cmd.CommandTimeout = Times;
// 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>
/// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
/// </summary>
/// <param name="strSQL">查询语句</param>
/// <returns>SqlDataReader</returns>
public static SqlDataReader ExecuteReader(string strSQL)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand(strSQL, connection);
try
{
connection.Open();
SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myReader;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
}
/// <summary>
/// 执行查询语句，返回DataSet
/// </summary>
/// <param name="SQLString">查询语句</param>
/// <returns>DataSet</returns>
public static DataSet Query(string SQLString)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
public static DataSet Query(string SQLString, int Times)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
command.SelectCommand.CommandTimeout = Times;
command.Fill(ds, "ds");
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
#endregion
#region 执行带参数的SQL语句
/// <summary>
/// 执行SQL语句，返回影响的记录数
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSql(string SQLString, params SqlParameter[] cmdParms)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
}
}
}
/// <summary>
/// 执行多条SQL语句，实现数据库事务。
/// </summary>
/// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
public static void ExecuteSqlTran(Hashtable SQLStringList)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
{
SqlCommand cmd = new SqlCommand();
try
{
//循环
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
}
trans.Commit();
}
catch
{
trans.Rollback();
throw;
}
}
}
}
/// <summary>
/// 执行多条SQL语句，实现数据库事务。
/// </summary>
/// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
{
SqlCommand cmd = new SqlCommand();
try
{
int indentity = 0;
//循环
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
foreach (SqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.InputOutput)
{
q.Value = indentity;
}
}
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
foreach (SqlParameter q in cmdParms)
{
if (q.Direction == ParameterDirection.Output)
{
indentity = Convert.ToInt32(q.Value);
}
}
cmd.Parameters.Clear();
}
trans.Commit();
}
catch
{
trans.Rollback();
throw;
}
}
}
}
/// <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 SQLString, params SqlParameter[] cmdParms)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand())
{
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 (System.Data.SqlClient.SqlException e)
{
throw e;
}
}
}
}
/// <summary>
/// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
/// </summary>
/// <param name="strSQL">查询语句</param>
/// <returns>SqlDataReader</returns>
public static SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] cmdParms)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand();
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return myReader;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
// finally
// {
// cmd.Dispose();
// connection.Close();
// }
}
/// <summary>
/// 执行查询语句，返回DataSet
/// </summary>
/// <param name="SQLString">查询语句</param>
/// <returns>DataSet</returns>
public static DataSet Query(string SQLString, params SqlParameter[] cmdParms)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, 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 = CommandType.Text;//cmdType;
if (cmdParms != null)
{
foreach (SqlParameter parameter in cmdParms)
{
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
cmd.Parameters.Add(parameter);
}
}
}
#endregion
#region 存储过程操作
/// <summary>
/// 执行存储过程，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>SqlDataReader</returns>
public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlDataReader returnReader;
connection.Open();
SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.CommandType = CommandType.StoredProcedure;
returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
return returnReader;
}
/// <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 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;
}
}
public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.SelectCommand.CommandTimeout = Times;
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
}
public static DataSet RunProcedure(string storedProcName, string tableName)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName);
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;
}
private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName)
{
SqlCommand command = new SqlCommand(storedProcName, connection);
command.CommandType = CommandType.StoredProcedure;
return command;
}
/// <summary>
/// 执行存储过程，返回影响的行数
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <param name="rowsAffected">影响的行数</param>
/// <returns></returns>
public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
int result;
connection.Open();
SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);
rowsAffected = command.ExecuteNonQuery();
result = (int)command.Parameters["ReturnValue"].Value;
//Connection.Close();
return result;
}
}
/// <summary>
/// 创建 SqlCommand 对象实例(用来返回一个整数值)
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>SqlCommand 对象实例</returns>
private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
{
SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.Parameters.Add(new SqlParameter("ReturnValue",
SqlDbType.Int, 4, ParameterDirection.ReturnValue,
false, 0, 0, string.Empty, DataRowVersion.Default, null));
return command;
}
#endregion
}
}
OracleHelper.cs
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.OracleClient;
using System.Linq;
using System.Text;
namespace HelpClass
{
public class OracleHelp
{
// 连接数据源
private OracleConnection conn = null;
/// <summary>
/// 数据源
/// </summary>
/// <param name="conStr">数据源连接字符串</param>
public OracleConnection DataBase(string conStr)
{
conn = new OracleConnection(conStr);
this.Open();
return conn;
}
/// <summary>
/// 根据SQL查询返回DataSet对象，如果没有查询到则返回NULL
/// </summary>
/// <param name="sql">查询语句</param>
/// <returns>DataSet</returns>
public DataSet GetDataSet(string sql)
{
DataSet ds = new DataSet();
try
{
OracleCommand cmd = new OracleCommand(sql, conn);
cmd.CommandTimeout = 20;
OracleDataAdapter adapter = new OracleDataAdapter(cmd);
adapter.Fill(ds, "tempTable");
}
catch (Exception e)
{
ds = null;
}
finally
{
this.Close();
this.Dispose();
}
return ds;
}
/// <summary>
/// 根据SQL查询返回DataSet对象，如果没有查询到则返回NULL
/// </summary>
/// <param name="sql">查询语句</param>
/// <param name="sRecord">开始记录数</param>
/// <param name="mRecord">最大记录数</param>
/// <returns>DataSet</returns>
public DataSet GetDataSet(string sql, int sRecord, int mRecord)
{
DataSet ds = new DataSet();
try
{
OracleCommand cmd = new OracleCommand(sql, conn);
cmd.CommandTimeout = 20;
OracleDataAdapter adapter = new OracleDataAdapter(cmd);
adapter.Fill(ds, sRecord, mRecord, "tempTable");
}
catch (Exception e)
{
ds = null;
}
finally
{
this.Close();
this.Dispose();
}
return ds;
}
/// <summary>
/// 对数据库的增，删，改的操作
/// </summary>
/// <param name="sql">SQL语句</param>
/// <returns>是否成功</returns>
public bool ExecuteDataBase(string sql)
{
bool succeed = false;
int cnt = 0;
try
{
OracleCommand cmd = new OracleCommand(sql, conn);
cmd.CommandTimeout = 20;
if (this.Open())
cnt = cmd.ExecuteNonQuery();
}
catch (Exception e)
{
e.ToString();
}
finally
{
if (cnt > 0)
{
succeed = true;
}
this.Close();
this.Dispose();
}
return succeed;
}
/// <summary>
/// 获得该SQL查询返回的第一行第一列的值，如果没有查询到则返回NULL
/// </summary>
/// <param name="sql">查询语句</param>
/// <returns>返回的第一行第一列的值</returns>
public string GetScalar(string sql)
{
string str = null;
try
{
OracleCommand cmd = new OracleCommand(sql, conn);
if (this.Open())
str = cmd.ExecuteScalar().ToString();
}
catch (Exception e)
{
e.ToString();
}
finally
{
this.Close();
this.Dispose();
}
return str;
}
/// <summary>
/// 获得该SQL查询返回DataTable，如果没有查询到则返回NULL
/// </summary>
/// <param name="sql">查询语句</param>
/// <returns></returns>
public DataTable GetDataTable(string sql)
{
DataTable tb = null;
DataSet ds = this.GetDataSet(sql);
if (ds != null)
{
tb = ds.Tables["tempTable"];
}
return tb;
}
/// <summary>
/// 打开数据库连接.
/// </summary>
private bool Open()
{
bool succeed = false;
try
{
if (conn.State == System.Data.ConnectionState.Closed)
{
conn.Open();
succeed = true;
}
else if (conn.State == System.Data.ConnectionState.Broken)
{
conn.Close();
conn.Open();
succeed = true;
}
else if (conn.State == System.Data.ConnectionState.Open)
{
succeed = true;
}
}
catch (Exception e)
{
e.ToString();
}
return succeed;
}
/// <summary>
/// 关闭数据库连接
/// </summary>
public void Close()
{
if (conn != null)
{
conn.Close();
}
}
/// <summary>
/// 释放数据库连接资源
/// </summary>
public void Dispose()
{
if (conn != null)
{
conn.Dispose();
conn = null;
}
}
}
}
AccessHelper.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System;
using System.Data;
using System.Data.OleDb;
namespace HelpClass
{
public class AccessHelp
{
// 连接数据源
private OleDbConnection conn = null;
/// <summary>
/// 数据源
/// </summary>
/// <param name="conStr">数据源连接字符串</param>
public OleDbConnection DataBase(string conStr)
{
conn = new OleDbConnection(conStr);
this.Open();
return conn;
}
/// <summary>
/// 根据SQL查询返回DataSet对象，如果没有查询到则返回NULL
/// </summary>
/// <param name="sql">查询语句</param>
/// <returns>DataSet</returns>
public DataSet GetDataSet(string sql)
{
DataSet ds = new DataSet();
try
{
OleDbCommand cmd = new OleDbCommand(sql, conn);
cmd.CommandTimeout = 20;
System.Data.OleDb.OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);
adapter.Fill(ds, "tempTable");
}
catch (Exception e)
{
ds = null;
}
finally
{
this.Close();
this.Dispose();
}
return ds;
}
/// <summary>
/// 根据SQL查询返回DataSet对象，如果没有查询到则返回NULL
/// </summary>
/// <param name="sql">查询语句</param>
/// <param name="sRecord">开始记录数</param>
/// <param name="mRecord">最大记录数</param>
/// <returns>DataSet</returns>
public DataSet GetDataSet(string sql, int sRecord, int mRecord)
{
DataSet ds = new DataSet();
try
{
OleDbCommand cmd = new OleDbCommand(sql, conn);
cmd.CommandTimeout = 20;
System.Data.OleDb.OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);
adapter.Fill(ds, sRecord, mRecord, "tempTable");
}
catch (Exception e)
{
ds = null;
}
finally
{
this.Close();
this.Dispose();
}
return ds;
}
/// <summary>
/// 对数据库的增，删，改的操作
/// </summary>
/// <param name="sql">SQL语句</param>
/// <returns>是否成功</returns>
public bool ExecuteDataBase(string sql)
{
bool succeed = false;
int cnt = 0;
try
{
OleDbCommand cmd = new OleDbCommand(sql, conn);
cmd.CommandTimeout = 20;
if (this.Open())
cnt = cmd.ExecuteNonQuery();
}
catch (Exception e)
{
e.ToString();
}
finally
{
if (cnt > 0)
{
succeed = true;
}
this.Close();
this.Dispose();
}
return succeed;
}
/// <summary>
/// 获得该SQL查询返回的第一行第一列的值，如果没有查询到则返回NULL
/// </summary>
/// <param name="sql">查询语句</param>
/// <returns>返回的第一行第一列的值</returns>
public string GetScalar(string sql)
{
string str = null;
try
{
OleDbCommand cmd = new OleDbCommand(sql, conn);
if (this.Open())
str = cmd.ExecuteScalar().ToString();
}
catch (Exception e)
{
e.ToString();
}
finally
{
this.Close();
this.Dispose();
}
return str;
}
/// <summary>
/// 获得该SQL查询返回DataTable，如果没有查询到则返回NULL
/// </summary>
/// <param name="sql">查询语句</param>
/// <returns></returns>
public DataTable GetDataTable(string sql)
{
DataTable tb = null;
DataSet ds = this.GetDataSet(sql);
if (ds != null)
{
tb = ds.Tables["tempTable"];
}
return tb;
}
/// <summary>
/// 打开数据库连接.
/// </summary>
private bool Open()
{
bool succeed = false;
try
{
if (conn.State == System.Data.ConnectionState.Closed)
{
conn.Open();
succeed = true;
}
else if (conn.State == System.Data.ConnectionState.Broken)
{
conn.Close();
conn.Open();
succeed = true;
}
else if(conn.State == System.Data.ConnectionState.Open)
{
succeed = true;
}
}
catch(Exception e)
{
e.ToString();
}
return succeed;
}
/// <summary>
/// 关闭数据库连接
/// </summary>
public void Close()
{
if (conn != null)
{
conn.Close();
}
}
/// <summary>
/// 释放数据库连接资源
/// </summary>
public void Dispose()
{
if (conn != null)
{
conn.Dispose();
conn = null;
}
}
}
}
