?usingSystem;
usingSystem.Collections.Generic;
usingSystem.Text;
usingSystem.Collections;
usingSystem.Collections.Specialized;
usingSystem.Data;
usingSystem.Data.SqlClient;
usingSystem.Configuration;
usingSystem.Web;
namespaceHengmyj
{
publicabstractclassDbHelperSQL
{
//protectedstaticstringconnectionString=ConfigurationManager.AppSettings["ConnectionString"];
protectedstaticstringconnectionString=PubConstant.ConnectionString;
//WebConfig中写入
节点中
//
//
publicDbHelperSQL()
{
}
#region公用方法
publicstaticintGetMaxID(stringFieldName,stringTableName)
{
stringstrsql="selectmax("+FieldName+")+1from"+TableName;
objectobj=GetSingle(strsql);
if(obj==null)
{
return1;
}
else
{
returnint.Parse(obj.ToString());
}
}
publicstaticboolExists(stringstrSql,paramsSqlParameter[]cmdParms)
{
objectobj=GetSingle(strSql,cmdParms);
intcmdresult;
if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))
{
cmdresult=0;
}
else
{
cmdresult=int.Parse(obj.ToString());
}
if(cmdresult==0)
{
returnfalse;
}
else
{
returntrue;
}
}
#endregion
#region执行简单SQL语句
///
///执行SQL语句，返回影响的记录数
///
///SQL语句
///影响的记录数
publicstaticintExecuteSql(stringSQLString)
{
using(SqlConnectionconnection=newSqlConnection(connectionString))
{
using(SqlCommandcmd=newSqlCommand(SQLString,connection))
{
try
{
connection.Open();
introws=cmd.ExecuteNonQuery();
returnrows;
}
catch(System.Data.SqlClient.SqlExceptionE)
{
connection.Close();
thrownewException(E.Message);
}
}
}
}
///
///执行多条SQL语句，实现数据库事务。
///
///多条SQL语句
publicstaticvoidExecuteSqlTran(ArrayListSQLStringList)
{
using(SqlConnectionconn=newSqlConnection(connectionString))
{
conn.Open();
SqlCommandcmd=newSqlCommand();
cmd.Connection=conn;
SqlTransactiontx=conn.BeginTransaction();
cmd.Transaction=tx;
try
{
for(intn=0;n {
stringstrsql=SQLStringList[n].ToString();
if(strsql.Trim().Length>1)
{
cmd.CommandText=strsql;
cmd.ExecuteNonQuery();
}
}
tx.Commit();
}
catch(System.Data.SqlClient.SqlExceptionE)
{
tx.Rollback();
thrownewException(E.Message);
}
}
}
///
///执行带一个存储过程参数的的SQL语句。
///
///SQL语句
///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
///影响的记录数
publicstaticintExecuteSql(stringSQLString,stringcontent)
{
using(SqlConnectionconnection=newSqlConnection(connectionString))
{
SqlCommandcmd=newSqlCommand(SQLString,connection);
System.Data.SqlClient.SqlParametermyParameter=newSystem.Data.SqlClient.SqlParameter("@content",SqlDbType.NText);
myParameter.Value=content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
introws=cmd.ExecuteNonQuery();
returnrows;
}
catch(System.Data.SqlClient.SqlExceptionE)
{
thrownewException(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
///
///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)
///
///SQL语句
///图像字节,数据库的字段类型为image的情况
///影响的记录数
publicstaticintExecuteSqlInsertImg(stringstrSQL,byte[]fs)
{
using(SqlConnectionconnection=newSqlConnection(connectionString))
{
SqlCommandcmd=newSqlCommand(strSQL,connection);
System.Data.SqlClient.SqlParametermyParameter=newSystem.Data.SqlClient.SqlParameter("@fs",SqlDbType.Image);
myParameter.Value=fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
introws=cmd.ExecuteNonQuery();
returnrows;
}
catch(System.Data.SqlClient.SqlExceptionE)
{
thrownewException(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
///
///执行一条计算查询结果语句，返回查询结果（object）。
///
///计算查询结果语句
///查询结果（object）
publicstaticobjectGetSingle(stringSQLString)
{
using(SqlConnectionconnection=newSqlConnection(connectionString))
{
using(SqlCommandcmd=newSqlCommand(SQLString,connection))
{
try
{
try
{
connection.Open();
}
catch(System.Data.SqlClient.SqlExceptionse)
{
thrownewException(se.Message);
//returnnull;
}
objectobj=cmd.ExecuteScalar();
if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))
{
return"";
}
else
{
returnobj;
}
}
catch(System.Data.SqlClient.SqlExceptione)
{
connection.Close();
thrownewException(e.Message);
}
}
}
}
///
///执行查询语句，返回SqlDataReader
///
///查询语句
///SqlDataReader
publicstaticSqlDataReaderExecuteReader(stringstrSQL)
{
SqlConnectionconnection=newSqlConnection(connectionString);
SqlCommandcmd=newSqlCommand(strSQL,connection);
//cmd.set
try
{
connection.Open();
SqlDataReadermyReader=cmd.ExecuteReader();
returnmyReader;
}
catch(System.Data.SqlClient.SqlExceptione)
{
thrownewException(e.Message);
}
}
///
///执行查询语句，返回DataSet
///
///查询语句
///DataSet
publicstaticDataSetQuery(stringSQLString)
{
using(SqlConnectionconnection=newSqlConnection(connectionString))
{
DataSetds=newDataSet();
try
{
connection.Open();
SqlDataAdaptercommand=newSqlDataAdapter(SQLString,connection);
command.Fill(ds,"ds");
}
catch(System.Data.SqlClient.SqlExceptionex)
{
thrownewException(ex.Message);
}
returnds;
}
}
///
///列表
///
///
///
///
///
publicstaticDataSetQuery(stringSQLString,intstart,intmaxinum)
{
using(SqlConnectionconnection=newSqlConnection(connectionString))
{
DataSetds=newDataSet();
try
{
connection.Open();
SqlDataAdaptercommand=newSqlDataAdapter(SQLString,connection);
command.Fill(ds,start,maxinum,"ds");
//command.Fill(ds,"ds");
}
catch(System.Data.SqlClient.SqlExceptionex)
{
thrownewException(ex.Message);
}
returnds;
}
}
#endregion
#region执行带参数的SQL语句
///
///执行SQL语句，返回影响的记录数
///
///SQL语句
///影响的记录数
publicstaticintExecuteSql(stringSQLString,paramsSqlParameter[]cmdParms)
{
using(SqlConnectionconnection=newSqlConnection(connectionString))
{
using(SqlCommandcmd=newSqlCommand())
{
try
{
PrepareCommand(cmd,connection,null,SQLString,cmdParms);
introws=cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
returnrows;
}
catch(System.Data.SqlClient.SqlExceptionE)
{
thrownewException(E.Message);
}
}
}
}
///
///执行多条SQL语句，实现数据库事务。
///
///SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）
publicstaticvoidExecuteSqlTran(HashtableSQLStringList)
{
using(SqlConnectionconn=newSqlConnection(connectionString))
{
conn.Open();
using(SqlTransactiontrans=conn.BeginTransaction())
{
SqlCommandcmd=newSqlCommand();
try
{
//循环
foreach(DictionaryEntrymyDEinSQLStringList)
{
stringcmdText=myDE.Key.ToString();
SqlParameter[]cmdParms=(SqlParameter[])myDE.Value;
PrepareCommand(cmd,conn,trans,cmdText,cmdParms);
intval=cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
trans.Commit();
}
}
catch
{
trans.Rollback();
throw;
}
}
}
}
///
///执行一条计算查询结果语句，返回查询结果（object）。
///
///计算查询结果语句
///查询结果（object）
publicstaticobjectGetSingle(stringSQLString,paramsSqlParameter[]cmdParms)
{
using(SqlConnectionconnection=newSqlConnection(connectionString))
{
using(SqlCommandcmd=newSqlCommand())
{
try
{
PrepareCommand(cmd,connection,null,SQLString,cmdParms);
objectobj=cmd.ExecuteScalar();
cmd.Parameters.Clear();
if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value)))
{
returnnull;
}
else
{
returnobj;
}
}
catch(System.Data.SqlClient.SqlExceptione)
{
thrownewException(e.Message);
}
}
}
}
///
///执行查询语句，返回SqlDataReader
///
///查询语句
///SqlDataReader
publicstaticSqlDataReaderExecuteReader(stringSQLString,paramsSqlParameter[]cmdParms)
{
SqlConnectionconnection=newSqlConnection(connectionString);
SqlCommandcmd=newSqlCommand();
try
{
PrepareCommand(cmd,connection,null,SQLString,cmdParms);
SqlDataReadermyReader=cmd.ExecuteReader();
cmd.Parameters.Clear();
returnmyReader;
}
catch(System.Data.SqlClient.SqlExceptione)
{
thrownewException(e.Message);
}
}
///
///执行查询语句，返回DataSet
///
///查询语句
///DataSet
publicstaticDataSetQuery(stringSQLString,paramsSqlParameter[]cmdParms)
{
using(SqlConnectionconnection=newSqlConnection(connectionString))
{
SqlCommandcmd=newSqlCommand();
PrepareCommand(cmd,connection,null,SQLString,cmdParms);
using(SqlDataAdapterda=newSqlDataAdapter(cmd))
{
DataSetds=newDataSet();
try
{
da.Fill(ds,"ds");
cmd.Parameters.Clear();
}
catch(System.Data.SqlClient.SqlExceptionex)
{
thrownewException(ex.Message);
}
returnds;
}
}
}
privatestaticvoidPrepareCommand(SqlCommandcmd,SqlConnectionconn,SqlTransactiontrans,stringcmdText,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(SqlParameterparmincmdParms)
cmd.Parameters.Add(parm);
}
}
#endregion
#region存储过程操作
///
///执行存储过程
///
///存储过程名
///存储过程参数
///SqlDataReader
publicstaticSqlDataReaderRunProcedure(stringstoredProcName,IDataParameter[]parameters)
{
SqlConnectionconnection=newSqlConnection(connectionString);
SqlDataReaderreturnReader;
connection.Open();
SqlCommandcommand=BuildQueryCommand(connection,storedProcName,parameters);
command.CommandType=CommandType.StoredProcedure;
returnReader=command.ExecuteReader();
returnreturnReader;
}
///
///执行存储过程自己指定数据库连接
///
///
///
///
///
publicstaticSqlDataReaderRunProcedure(stringstoredProcName,IDataParameter[]parameters,SqlConnectionconnection)
{
SqlDataReaderreturnReader;
//connection.Open();
SqlCommandcommand=BuildQueryCommand(connection,storedProcName,parameters);
command.CommandType=CommandType.StoredProcedure;
returnReader=command.ExecuteReader();
returnreturnReader;
}
///
///执行存储过程
///
///存储过程名
///存储过程参数
///DataSet结果中的表名
///DataSet
publicstaticDataSetRunProcedure(stringstoredProcName,IDataParameter[]parameters,stringtableName)
{
using(SqlConnectionconnection=newSqlConnection(connectionString))
{
DataSetdataSet=newDataSet();
connection.Open();
SqlDataAdaptersqlDA=newSqlDataAdapter();
sqlDA.SelectCommand=BuildQueryCommand(connection,storedProcName,parameters);
sqlDA.Fill(dataSet,tableName);
connection.Close();
returndataSet;
}
}
#region
#endregion
///
///构建SqlCommand对象(用来返回一个结果集，而不是一个整数值)
///
///数据库连接
///存储过程名
///存储过程参数
///SqlCommand
privatestaticSqlCommandBuildQueryCommand(SqlConnectionconnection,stringstoredProcName,IDataParameter[]parameters)
{
SqlCommandcommand=newSqlCommand(storedProcName,connection);
command.CommandType=CommandType.StoredProcedure;
foreach(SqlParameterparameterinparameters)
{
command.Parameters.Add(parameter);
}
returncommand;
}
///
///执行存储过程，返回影响的行数
///
///存储过程名
///存储过程参数
///影响的行数
///
publicstaticintRunProcedure(stringstoredProcName,IDataParameter[]parameters,outintrowsAffected)
{
using(SqlConnectionconnection=newSqlConnection(connectionString))
{
intresult;
connection.Open();
SqlCommandcommand=BuildIntCommand(connection,storedProcName,parameters);
rowsAffected=command.ExecuteNonQuery();
result=(int)command.Parameters["ReturnValue"].Value;
//Connection.Close();
returnresult;
}
}
///
///创建SqlCommand对象实例(用来返回一个整数值)
///
///存储过程名
///存储过程参数
///SqlCommand对象实例
privatestaticSqlCommandBuildIntCommand(SqlConnectionconnection,stringstoredProcName,IDataParameter[]parameters)
{
SqlCommandcommand=BuildQueryCommand(connection,storedProcName,parameters);
command.Parameters.Add(newSqlParameter("ReturnValue",
SqlDbType.Int,4,ParameterDirection.ReturnValue,
false,0,0,string.Empty,DataRowVersion.Default,null));
returncommand;
}
#endregion
}
}
