c oracle帮助类,C#DbHelperOra,Oracle数据库帮助类
[C#] 純文本查看 復制代碼///
/// 編 碼 人：蘇飛
/// 聯系方式：361983679
/// 更新網站：[url=http://www.sufeinet.com/thread-655-1-1.html]http://www.sufeinet.com/thread-655-1-1.html[/url]
///
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.OracleClient;
using System.Configuration;
namespace Maticsoft.DBUtility
{
///
/// 數據訪問基礎類(基于Oracle)
/// 可以用戶可以修改滿足自己項目的需要。
///
public abstract class DbHelperOra
{
//數據庫連接字符串(web.config來配置)，可以動態更改connectionString支持多數據庫.
public static string connectionString = "連接字符串";
public DbHelperOra()
{
}
#region 公用方法
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;
}
}
public static bool Exists(string strSql, params OracleParameter[] 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 執行簡單SQL語句
///
/// 執行SQL語句，返回影響的記錄數
///
/// SQL語句
/// 影響的記錄數
public static int ExecuteSql(string SQLString)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
using (OracleCommand cmd = new OracleCommand(SQLString,connection))
{
try
{
connection.Open();
int rows=cmd.ExecuteNonQuery();
return rows;
}
catch(System.Data.OracleClient.OracleException E)
{
connection.Close();
throw new Exception(E.Message);
}
}
}
}
///
/// 執行多條SQL語句，實現數據庫事務。
///
/// 多條SQL語句
public static void ExecuteSqlTran(ArrayList SQLStringList)
{
using (OracleConnection conn = new OracleConnection(connectionString))
{
conn.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection=conn;
OracleTransaction tx=conn.BeginTransaction();
cmd.Transaction=tx;
try
{
for(int n=0;n
{
string strsql=SQLStringList[n].ToString();
if (strsql.Trim().Length>1)
{
cmd.CommandText=strsql;
cmd.ExecuteNonQuery();
}
}
tx.Commit();
}
catch(System.Data.OracleClient.OracleException E)
{
tx.Rollback();
throw new Exception(E.Message);
}
}
}
///
/// 執行帶一個存儲過程參數的的SQL語句。
///
/// SQL語句
/// 參數內容,比如一個字段是格式復雜的文章，有特殊符號，可以通過這個方式添加
/// 影響的記錄數
public static int ExecuteSql(string SQLString,string content)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
OracleCommand cmd = new OracleCommand(SQLString,connection);
System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@content", OracleType.NVarChar);
myParameter.Value = content ;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows=cmd.ExecuteNonQuery();
return rows;
}
catch(System.Data.OracleClient.OracleException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
///
/// 向數據庫里插入圖像格式的字段(和上面情況類似的另一種實例)
///
/// SQL語句
/// 圖像字節,數據庫的字段類型為image的情況
/// 影響的記錄數
public static int ExecuteSqlInsertImg(string strSQL,byte[] fs)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
OracleCommand cmd = new OracleCommand(strSQL,connection);
System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@fs", OracleType.LongRaw);
myParameter.Value = fs ;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows=cmd.ExecuteNonQuery();
return rows;
}
catch(System.Data.OracleClient.OracleException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
///
/// 執行一條計算查詢結果語句，返回查詢結果(object)。
///
/// 計算查詢結果語句
/// 查詢結果(object)
public static object GetSingle(string SQLString)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
using(OracleCommand cmd = new OracleCommand(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.OracleClient.OracleException e)
{
connection.Close();
throw new Exception(e.Message);
}
}
}
}
///
/// 執行查詢語句，返回OracleDataReader ( 注意：調用該方法后，一定要對SqlDataReader進行Close )
///
/// 查詢語句
/// OracleDataReader
public static OracleDataReader ExecuteReader(string strSQL)
{
OracleConnection connection = new OracleConnection(connectionString);
OracleCommand cmd = new OracleCommand(strSQL,connection);
try
{
connection.Open();
OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myReader;
}
catch(System.Data.OracleClient.OracleException e)
{
throw new Exception(e.Message);
}
}
///
/// 執行查詢語句，返回DataSet
///
/// 查詢語句
/// DataSet
public static DataSet Query(string SQLString)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
OracleDataAdapter command = new OracleDataAdapter(SQLString,connection);
command.Fill(ds,"ds");
}
catch(System.Data.OracleClient.OracleException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
#endregion
#region 執行帶參數的SQL語句
///
/// 執行SQL語句，返回影響的記錄數
///
/// SQL語句
/// 影響的記錄數
public static int ExecuteSql(string SQLString,params OracleParameter[] cmdParms)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
using (OracleCommand cmd = new OracleCommand())
{
try
{
PrepareCommand(cmd, connection, null,SQLString, cmdParms);
int rows=cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch(System.Data.OracleClient.OracleException E)
{
throw new Exception(E.Message);
}
}
}
}
///
/// 執行多條SQL語句，實現數據庫事務。
///
/// SQL語句的哈希表(key為sql語句，value是該語句的OracleParameter[])
public static void ExecuteSqlTran(Hashtable SQLStringList)
{
using (OracleConnection conn = new OracleConnection(connectionString))
{
conn.Open();
using (OracleTransaction trans = conn.BeginTransaction())
{
OracleCommand cmd = new OracleCommand();
try
{
//循環
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText=myDE.Key.ToString();
OracleParameter[] cmdParms=(OracleParameter[])myDE.Value;
PrepareCommand(cmd,conn,trans,cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
trans.Commit();
}
}
catch
{
trans.Rollback();
throw;
}
}
}
}
///
/// 執行一條計算查詢結果語句，返回查詢結果(object)。
///
/// 計算查詢結果語句
/// 查詢結果(object)
public static object GetSingle(string SQLString,params OracleParameter[] cmdParms)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
using (OracleCommand cmd = new OracleCommand())
{
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.OracleClient.OracleException e)
{
throw new Exception(e.Message);
}
}
}
}
///
/// 執行查詢語句，返回OracleDataReader ( 注意：調用該方法后，一定要對SqlDataReader進行Close )
///
/// 查詢語句
/// OracleDataReader
public static OracleDataReader ExecuteReader(string SQLString,params OracleParameter[] cmdParms)
{
OracleConnection connection = new OracleConnection(connectionString);
OracleCommand cmd = new OracleCommand();
try
{
PrepareCommand(cmd, connection, null,SQLString, cmdParms);
OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return myReader;
}
catch(System.Data.OracleClient.OracleException e)
{
throw new Exception(e.Message);
}
}
///
/// 執行查詢語句，返回DataSet
///
/// 查詢語句
/// DataSet
public static DataSet Query(string SQLString,params OracleParameter[] cmdParms)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
OracleCommand cmd = new OracleCommand();
PrepareCommand(cmd, connection, null,SQLString, cmdParms);
using( OracleDataAdapter da = new OracleDataAdapter(cmd) )
{
DataSet ds = new DataSet();
try
{
da.Fill(ds,"ds");
cmd.Parameters.Clear();
}
catch(System.Data.OracleClient.OracleException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
private static void PrepareCommand(OracleCommand cmd,OracleConnection conn,OracleTransaction trans, string cmdText, OracleParameter[] 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 (OracleParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
#endregion
#region 存儲過程操作
///
/// 執行存儲過程 返回SqlDataReader ( 注意：調用該方法后，一定要對SqlDataReader進行Close )
///
/// 存儲過程名
/// 存儲過程參數
/// OracleDataReader
public static OracleDataReader RunProcedure(string storedProcName, IDataParameter[] parameters )
{
OracleConnection connection = new OracleConnection(connectionString);
OracleDataReader returnReader;
connection.Open();
OracleCommand command = BuildQueryCommand( connection,storedProcName, parameters );
command.CommandType = CommandType.StoredProcedure;
returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
return returnReader;
}
///
/// 執行存儲過程
///
/// 存儲過程名
/// 存儲過程參數
/// DataSet結果中的表名
/// DataSet
public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName )
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
OracleDataAdapter sqlDA = new OracleDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters );
sqlDA.Fill( dataSet, tableName );
connection.Close();
return dataSet;
}
}
///
/// 構建 OracleCommand 對象(用來返回一個結果集，而不是一個整數值)
///
/// 數據庫連接
/// 存儲過程名
/// 存儲過程參數
/// OracleCommand
private static OracleCommand BuildQueryCommand(OracleConnection connection,string storedProcName, IDataParameter[] parameters)
{
OracleCommand command = new OracleCommand( storedProcName, connection );
command.CommandType = CommandType.StoredProcedure;
foreach (OracleParameter parameter in parameters)
{
command.Parameters.Add( parameter );
}
return command;
}
///
/// 執行存儲過程，返回影響的行數
///
/// 存儲過程名
/// 存儲過程參數
/// 影響的行數
///
public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected )
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
int result;
connection.Open();
OracleCommand command = BuildIntCommand(connection,storedProcName, parameters );
rowsAffected = command.ExecuteNonQuery();
result = (int)command.Parameters["ReturnValue"].Value;
//Connection.Close();
return result;
}
}
///
/// 創建 OracleCommand 對象實例(用來返回一個整數值)
///
/// 存儲過程名
/// 存儲過程參數
/// OracleCommand 對象實例
private static OracleCommand BuildIntCommand(OracleConnection connection,string storedProcName, IDataParameter[] parameters)
{
OracleCommand command = BuildQueryCommand(connection,storedProcName, parameters );
command.Parameters.Add( new OracleParameter ( "ReturnValue",
OracleType.Int32, 4, ParameterDirection.ReturnValue,
false,0,0,string.Empty,DataRowVersion.Default,null ));
return command;
}
#endregion
}
}
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