using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;
using System.Collections;
namespace DataBaseHelp
{
/// <summary>
/// 数据访问抽象基础类
/// Copyright (C) 2009 By Zhuangyq
/// </summary>
public abstract class DbHelperSQL
{
#region fields
//public static string connectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
//public static string connectionString = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"];
public static string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
#endregion
#region constructor
public DbHelperSQL()
{ }
#endregion
#region 执行简单SQL语句
#region ExecuteSql
/// <summary>
/// 执行SQL语句，返回受影响的记录数
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// 一般用于增、删、改，而不用于查询，因为如果是查询受影响的行数返回为-1
/// <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;
}
}
}
}
#endregion
#region ExecuteSqlByTime
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 (SqlException e)
{
connection.Close();
throw e;
}
}
}
}
#endregion
#region ExecuteSqlTran
/// <summary>
/// 执行多条SQL语句，实现数据事务
/// </summary>
/// List<string> lists = new List<string>();
/// lists.Add("UPDATE course SET fenshu = '130' WHERE id =22");
/// lists.Add("UPDATE course SET fenshu = '130' WHERE id =23");
/// lists.Add("UPDATE course SET fenshu = '130' WHERE id =24");
/// lists.Add("SELECT * FROM course");
/// 以上执行结果，受影响的行数，最后返回为2，因为SELECT * FROM course，受影响到行数值为-1
/// <param name="SQLStringList"></param>
/// <returns></returns>
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 i = 0; i < SQLStringList.Count; i++)
{
string strsql = SQLStringList[i];
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
count += cmd.ExecuteNonQuery();
}
}
tx.Commit();
return count;
}
catch
{
tx.Rollback();
return 0;
}
}
}
#endregion
#region 带@content参数的SQL语句
#region ExecuteSql
/// <summary>
/// 执行带参数的SQL语句
/// </summary>
/// <param name="SQLString">执行的SQL语句</param>
/// <param name="content">参数的值</param>
/// 对于增、删、改语句：
/// DbHelperSQL.ExecuteSql("insert into course values(@CONTENT,'语文',120)", "kencell22");
/// DbHelperSQL.ExecuteSql("delete from course where name = @CONTENT", "kencell");
/// DbHelperSQL.ExecuteSql("update course set name = @CONTENT where id = 26", "xiaozhuang");
/// 以上三句在执行cmd.ExecuteNonQuery();语句时，才对数据库操作。此时返回的为此三种操作的受影响的行数。
/// 只有执行DbHelperSQL.ExecuteSql("select * From course where name = @content", "kencell");语句时，rows不是返回受影响的行数，而是-1
/// @CONTENT可以是小写也可以是大写，但是参数名称一定要一致@CONTENTX就会报错
/// <returns>受影响的行数</returns>
public static int ExecuteSql(string SQLString, string content)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(SQLString, conn);
System.Data.SqlClient.SqlParameter myparameter = new SqlParameter("@content", SqlDbType.VarChar);
myparameter.Value = content;
cmd.Parameters.Add(myparameter);
try
{
conn.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
conn.Close();
}
}
}
#endregion
#region ExecuteSqlGet
public static object ExecuteSqlGet(string SQLString, string content)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(SQLString, conn);
System.Data.SqlClient.SqlParameter myparameter = new SqlParameter("@content", SqlDbType.NText);
myparameter.Value = content;
cmd.Parameters.Add(myparameter);
try
{
conn.Open();
object obj = cmd.ExecuteScalar();
if (Object.Equals(obj, null) || Object.Equals(obj, DBNull.Value))
{
return null;
}
else
{
return obj;
}
}
catch (System.Data.SqlClient.SqlException e)
{
throw e;
}
finally
{
cmd.Dispose();
conn.Close();
}
}
}
#endregion
#endregion
#region GetSingle
/// <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>
/// 对于增、删、改语句：
/// insert into course values('zhuangyq','语文',80)
/// delete from course where id = 28
/// update course set fenshu = '102' where id = 26
/// 以上三句在执行cmd.ExecuteScalar();语句时，才对数据库操作。此时返回的obj为nul
/// 只有执行select * From course语句时，obj为查询所返回的结果集中的第一行的第一列
/// <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;
}
}
}
}
#endregion
#region ExecuteReader
/// <summary>
/// 执行查询语句，返回DataSet
/// </summary>
/// <param name="SQLString">查询语句</param>
/// 对于增、删、改语句：
/// insert into course values('zhuangyq','语文',80)
/// delete from course where id = 28
/// update course set fenshu = '102' where id = 26
/// 以上三句在执行cmd.ExecuteReader(CommandBehavior.CloseConnection)语句时，才对数据库操作。此时返回的myReader的GetSchemaTable()为null，不存在表
/// 只有执行select * From course语句时，返回的myReader的GetSchemaTable()表才不为空，此时可以把改myReader转化为DataTable
/// <returns></returns>
public static SqlDataReader ExecuteReader(string SQLString)
{
//using (SqlConnection conn = new SqlConnection(connectionString))
//{
// using (SqlCommand cmd = new SqlCommand(SQLString, conn))
// {
// try
// {
// conn.Open();
// SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
// return myReader;
// }
// catch (System.Data.SqlClient.SqlException e)
// {
// conn.Close();
// throw e;
// }
// }
//}
//千万不要像上面那样写，不然调用conn.Dispose()对象，导致连接关闭，那么就不能使用myReader
//SqlDataReader 只能在保持跟数据库连接的状态下才可以读取
SqlConnection conn = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand(SQLString, conn);
try
{
conn.Open();
//给cmd.ExecuteReader加上参数CommandBehavior.CloseConnection会在cmd.ExecuteReader执行完后自动关闭与之相关联的conn
SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myReader;
}
catch (SqlException e)
{
conn.Close();
throw e;
}
//也千万不要加上如下语句，否则
//finally
//{
// cmd.Dispose();
// conn.Close();
//}
}
#endregion
#region Query
/// <summary>
/// 执行查询语句，返回DataSet
/// </summary>
/// <param name="SQLString">查询语句</param>
/// 对于增、删、改语句：
/// insert into course values('zhuangyq','语文',80)
/// delete from course where id = 27
/// update course set fenshu = '100' where id = 26
/// 以上三句在执行datpter.Fill(ds, "Table1")语句时，才对数据库操作，此时返回的ds对象不存在任何表
/// 只有执行select * From course语句时，返回的DataSet才有表，表名为：Table1
/// SqlDataAdapter 大多情况下是一次性读取一个表，然后填充到DataSet中，然后就可以断开跟数据库的连接了。
/// <returns>DataSet</returns>
public static DataSet Query(string SQLString)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
conn.Open();
SqlDataAdapter datpter = new SqlDataAdapter(SQLString, conn);
datpter.Fill(ds, "Table1");
return ds;
}
catch (SqlException e)
{
conn.Close();
throw e;
}
}
}
#endregion
#endregion
#region 执行带参数的SQL语句
#region PrepareCommand
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;
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 ExecuteSql
/// <summary>
/// 执行SQL语句，返回影响的记录数
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <param name="cmdParms">受影响的行数</param>
/// 执行实例一(输入参数)：
/// SqlParameter[] parms = new SqlParameter[] { new SqlParameter("@FENSHU", SqlDbType.Int),
/// new SqlParameter("@KECHENG",SqlDbType.VarChar)};
/// parms[0].Value = 77;
/// parms[1].Value = "物理";
/// int count = DbHelperSQL.ExecuteSql("update course set fenshu = @fenshu,kecheng = @kecheng where id = 26", parms);
/// 执行实例二(输出参数)：
/// SqlParameter[] parms = new SqlParameter[] { new SqlParameter("@total", SqlDbType.Int),
/// new SqlParameter("@rows",SqlDbType.Int)};
/// parms[0].Direction = ParameterDirection.Output;
/// parms[1].Direction = ParameterDirection.Output;
/// int affect = DbHelperSQL.ExecuteSql("select @total = sum(fenshu),@rows=count(1) from course", parms);
/// int total = Convert.ToInt32(parms[0].Value);
/// int rows = Convert.ToInt32(parms[1].Value);
/// <returns></returns>
public static int ExecuteSql(string SQLString, params SqlParameter[] cmdParms)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand())
{
try
{
PrepareCommand(cmd, conn, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch(SqlException e)
{
throw e;
}
}
}
}
#endregion
#region ExecuteSqlTran
/// <summary>
/// 执行多条SQL语句，实现数据库事务。
/// </summary>
/// Hashtable hs = new Hashtable();
/// SqlParameter[] parms = new SqlParameter[] { new SqlParameter("@FENSHU", SqlDbType.Int),
/// new SqlParameter("@KECHENG",SqlDbType.VarChar)};
/// parms[0].Value = 112;
/// parms[1].Value = "历史";
/// SqlParameter[] parms1 = new SqlParameter[] { new SqlParameter("@NAME", SqlDbType.VarChar),
/// new SqlParameter("@FENSHU", SqlDbType.Int),
/// new SqlParameter("@KECHENG",SqlDbType.VarChar)};
/// parms1[0].Value = "kenchell";
/// parms1[1].Value = 123;
/// parms1[2].Value = "生物";
/// hs.Add("update course set fenshu = @fenshu,kecheng = @kecheng where id = 26", parms);
/// hs.Add("insert into course(name,fenshu,kecheng) values (@name,@fenshu,@kecheng)", parms1);
/// DbHelperSQL.ExecuteSqlTran(hs);
/// <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
{
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();//记得清除参数
}
trans.Commit();
}
catch(SqlException ex)
{
trans.Rollback();
throw ex;
}
}
}
}
#endregion
#region ExecuteReader
/// <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)
{
connection.Close();
throw e;
}
//finally
//{
// cmd.Dispose();
// connection.Close();
//}
}
#endregion
#region Query
/// <summary>
/// 执行查询语句，返回DataSet
/// </summary>
/// SqlParameter[] parms = new SqlParameter[] { new SqlParameter("@KECHENG",SqlDbType.VarChar)};
/// parms[0].Value = "语文";
/// DataSet ds = DbHelperSQL.Query("select * From course where kecheng = @kecheng", parms);
/// <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, "Table1");
cmd.Parameters.Clear();
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
#endregion
#endregion
#region 执行存储过程操作
#region BuildQueryCommand
private static SqlCommand BuildQueryCommand(SqlConnection conn, string storedProcName, IDataParameter[] parameters)
{
SqlCommand cmd = new SqlCommand(storedProcName, conn);
cmd.CommandType = CommandType.StoredProcedure;
foreach (SqlParameter parameter in parameters)
{
if (parameter != null)
{
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
cmd.Parameters.Add(parameter);
}
}
return cmd;
}
#endregion
#region RunProcedure
/// <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>
/// 存储过程：
/// ALTER PROC [dbo].[SP_QueryData]
/// (
/// @kecheng varchar(20),
/// @COUNT INT OUTPUT
/// )
/// AS
/// BEGIN
/// SELECT * FROM COURSE WHERE kecheng = @kecheng //如果有多个的查询语句，则返回第一个查询语句的SqlDataReader
/// SELECT @COUNT = COUNT(1) FROM COURSE
/// END
/// 客户端代码：
/// try
/// {
/// SqlParameter[] parms = new SqlParameter[]{new SqlParameter("@Kecheng",SqlDbType.VarChar),
/// new SqlParameter("@COUNT",SqlDbType.Int)};
/// parms[0].Value = "语文";
/// parms[1].Direction = ParameterDirection.Output;
/// SqlDataReader reader = DbHelperSQL.RunProcedure("SP_QUERYDATA", parms);
/// DataTable dt = ConvertDataReaderToDataTable(reader);
/// this.dataGridView1.DataSource = dt;
/// int count = Convert.ToInt32(parms[1].Value);
/// }
/// catch (Exception ex)
/// {
/// MessageBox.Show(ex.Message);
/// }
/// <returns></returns>
public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
{
SqlConnection conn = new SqlConnection(connectionString);
conn.Open();
SqlCommand cmd = BuildQueryCommand(conn, storedProcName, parameters);
//cmd.CommandType = CommandType.StoredProcedure;
SqlDataReader returnReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return returnReader;
}
#endregion
#region RunProcedure
/// <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">表名</param>
/// ALTER PROC [DBO].[SP_QUERYDATA]
/// (
/// @KECHENG VARCHAR(20),
/// @COUNT INT OUTPUT
/// )
/// AS
/// BEGIN
/// SELECT * FROM STUDENT
/// SELECT * FROM COURSE WHERE KECHENG = @KECHENG
/// SELECT * FROM CATEGORY
/// SELECT @COUNT = COUNT(1) FROM COURSE
/// END
/// try
/// {
/// SqlParameter[] parms = new SqlParameter[]{new SqlParameter("@Kecheng",SqlDbType.VarChar),
/// new SqlParameter("@COUNT",SqlDbType.Int)};
/// parms[0].Value = "语文";
/// parms[1].Direction = ParameterDirection.Output;
/// DataSet ds = DbHelperSQL.RunProcedure("SP_QUERYDATA", parms,"MyTable");//整个ds返回3张表，每张表的表名为分别为MyTable、MyTable1、MyTable2
/// this.dataGridView1.DataSource = ds.Tables[0];
/// int count = Convert.ToInt32(parms[1].Value);
/// }
/// catch (Exception ex)
/// {
/// MessageBox.Show(ex.Message);
/// }
/// <returns>DataSet结果中的表名</returns>
public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
DataSet ds = new DataSet();
conn.Open();
SqlDataAdapter dataAdap = new SqlDataAdapter();
dataAdap.SelectCommand = BuildQueryCommand(conn,storedProcName,parameters);
dataAdap.Fill(ds, tableName);
conn.Close();
return ds;
}
}
#endregion
#region RunProcedure
/// <summary>
/// 执行存储过程
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">参数</param>
/// <param name="RowsAffected">受影响的行数</param>
/// ALTER PROC [DBO].[SP_QUERYDATA]
/// (
/// @KECHENG VARCHAR(20),
/// @COUNT INT OUTPUT
/// )
/// AS
/// BEGIN
/// SELECT * FROM STUDENT
/// SELECT * FROM COURSE WHERE KECHENG = @KECHENG
/// SELECT * FROM CATEGORY
/// update STUDENT set 分数 = 99 where 科目='数学'
/// SELECT @COUNT = COUNT(1) FROM COURSE
/// insert into STUDENT select '语文',88,'hello'
/// insert into STUDENT select '语文',89,'hello'
/// delete from COURSE where id= 35
/// return 78;
/// END
/// <returns>存储过程return的值</returns>
public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int RowsAffected)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
int result;
conn.Open();
SqlCommand cmd = BuildQueryCommand(conn, storedProcName, parameters);
cmd.Parameters.Add(new SqlParameter("ReturnValue", SqlDbType.Int, 4, ParameterDirection.ReturnValue,
false,0,0,string.Empty,DataRowVersion.Default,null));
RowsAffected = cmd.ExecuteNonQuery();//返回存储过程中增、删、改等受影响的行数之和
result = (int)cmd.Parameters["ReturnValue"].Value; //存储过程的返回值
return result;
}
}
#endregion
#endregion
}
}