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C#教程之c#实现的操作oracle通用类
修改整理的一个通用类,用来操作oracle数据库 十分的方便,支持直接操作sql语句和Hash表操作.现在修补MIS我都用这个类,节约了大 量的代码与工作良!在老孙的指点下,偶将操作oracle,sql server ,access三种数据库的通用类集成在一起写了个数据抽象工厂,同时支持三种数据库无缝切换...以后整理出来.
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using System; using System.Data; using System.Data.OracleClient; using System.Collections; using System.Reflection; namespace MyOraComm { /// <summary> /// ConnDbForOracle 的摘要说明。 /// </summary> public class ConnForOracle { protected OracleConnection Connection; private string connectionString; public ConnForOracle() { string connStr; connStr = System.Configuration.ConfigurationSettings.AppSettings[ "connStr" ].ToString(); connectionString = connStr; Connection = new OracleConnection(connectionString); } #region 带参数的构造函数 /// <summary> /// 带参数的构造函数 /// </summary> /// <param name="ConnString">数据库联接字符串</param> public ConnForOracle( string ConnString) { string connStr; connStr = System.Configuration.ConfigurationSettings.AppSettings[ConnString].ToString(); Connection = new OracleConnection(connStr); } #endregion #region 打开数据库 /// <summary> /// 打开数据库 /// </summary> public void OpenConn() { if ( this .Connection.State!=ConnectionState.Open) this .Connection.Open(); } #endregion #region 关闭数据库联接 /// <summary> /// 关闭数据库联接 /// </summary> public void CloseConn() { if (Connection.State==ConnectionState.Open) Connection.Close(); } #endregion #region 执行SQL语句,返回数据到DataSet中 /// <summary> /// 执行SQL语句,返回数据到DataSet中 /// </summary> /// <param name="sql">sql语句</param> /// <param name="DataSetName">自定义返回的DataSet表名</param> /// <returns>返回DataSet</returns> public DataSet ReturnDataSet( string sql, string DataSetName) { DataSet dataSet= new DataSet(); OpenConn(); OracleDataAdapter OraDA= new OracleDataAdapter(sql,Connection); OraDA.Fill(dataSet,DataSetName); // CloseConn(); return dataSet; } #endregion #region 执行Sql语句,返回带分页功能的dataset /// <summary> /// 执行Sql语句,返回带分页功能的dataset /// </summary> /// <param name="sql">Sql语句</param> /// <param name="PageSize">每页显示记录数</param> /// <param name="CurrPageIndex"><当前页/param> /// <param name="DataSetName">返回dataset表名</param> /// <returns>返回DataSet</returns> public DataSet ReturnDataSet( string sql, int PageSize, int CurrPageIndex, string DataSetName) { DataSet dataSet= new DataSet(); OpenConn(); OracleDataAdapter OraDA= new OracleDataAdapter(sql,Connection); OraDA.Fill(dataSet,PageSize * (CurrPageIndex - 1), PageSize,DataSetName); // CloseConn(); return dataSet; } #endregion #region 执行SQL语句,返回 DataReader,用之前一定要先.read()打开,然后才能读到数据 /// <summary> /// 执行SQL语句,返回 DataReader,用之前一定要先.read()打开,然后才能读到数据 /// </summary> /// <param name="sql">sql语句</param> /// <returns>返回一个OracleDataReader</returns> public OracleDataReader ReturnDataReader(String sql) { OpenConn(); OracleCommand command = new OracleCommand(sql,Connection); return command.ExecuteReader(System.Data.CommandBehavior.CloseConnection); } #endregion #region 执行SQL语句,返回记录总数数 /// <summary> /// 执行SQL语句,返回记录总数数 /// </summary> /// <param name="sql">sql语句</param> /// <returns>返回记录总条数</returns> public int GetRecordCount( string sql) { int recordCount = 0; OpenConn(); OracleCommand command = new OracleCommand(sql,Connection); OracleDataReader dataReader = command.ExecuteReader(); while (dataReader.Read()) { recordCount++; } dataReader.Close(); // CloseConn(); return recordCount; } #endregion #region 取当前序列,条件为seq.nextval或seq.currval /// <summary> /// 取当前序列 /// </summary> /// <param name="seqstr"></param> /// <param name="table"></param> /// <returns></returns> public decimal GetSeq( string seqstr) { decimal seqnum = 0; string sql= "select " +seqstr+ " from dual" ; OpenConn(); OracleCommand command = new OracleCommand(sql,Connection); OracleDataReader dataReader = command.ExecuteReader(); if (dataReader.Read()) { seqnum= decimal .Parse(dataReader[0].ToString()); } dataReader.Close(); // CloseConn(); return seqnum; } #endregion #region 执行SQL语句,返回所影响的行数 /// <summary> /// 执行SQL语句,返回所影响的行数 /// </summary> /// <param name="sql"></param> /// <returns></returns> public int ExecuteSQL( string sql) { int Cmd=0; OpenConn(); OracleCommand command = new OracleCommand(sql,Connection); try { Cmd =command.ExecuteNonQuery(); } catch { } finally { // CloseConn(); } return Cmd; } #endregion // =========================================== // ==用hashTable对数据库进行insert,update,del操作,注意此时只能用默认的数据库连接"connstr"== // ============================================ #region 根据表名及哈稀表自动插入数据库 用法:Insert("test",ht) public int Insert( string TableName,Hashtable ht) { OracleParameter[] Parms= new OracleParameter[ht.Count]; IDictionaryEnumerator et = ht.GetEnumerator(); DataTable dt=GetTabType(TableName); System.Data.OracleClient.OracleType otype; int size=0; int i=0; while ( et.MoveNext() ) // 作哈希表循环 { GetoType(et.Key.ToString().ToUpper(),dt, out otype, out size); System.Data.OracleClient.OracleParameter op=MakeParam( ":" +et.Key.ToString(),otype,size,et.Value.ToString()); Parms[i]=op; // 添加SqlParameter对象 i=i+1; } string str_Sql=GetInsertSqlbyHt(TableName,ht); // 获得插入sql语句 int val=ExecuteNonQuery(str_Sql,Parms); return val; } #endregion #region 根据相关条件对数据库进行更新操作 用法:Update("test","Id=:Id",ht); public int Update( string TableName, string ht_Where, Hashtable ht) { OracleParameter[] Parms= new OracleParameter[ht.Count]; IDictionaryEnumerator et = ht.GetEnumerator(); DataTable dt=GetTabType(TableName); System.Data.OracleClient.OracleType otype; int size=0; int i=0; // 作哈希表循环 while ( et.MoveNext() ) { GetoType(et.Key.ToString().ToUpper(),dt, out otype, out size); System.Data.OracleClient.OracleParameter op=MakeParam( ":" +et.Key.ToString(),otype,size,et.Value.ToString()); Parms[i]=op; // 添加SqlParameter对象 i=i+1; } string str_Sql=GetUpdateSqlbyHt(TableName,ht_Where,ht); // 获得插入sql语句 int val=ExecuteNonQuery(str_Sql,Parms); return val; } #endregion #region del操作,注意此处条件个数与hash里参数个数应该一致 用法:Del("test","Id=:Id",ht) public int Del( string TableName, string ht_Where,Hashtable ht) { OracleParameter[] Parms= new OracleParameter[ht.Count]; IDictionaryEnumerator et = ht.GetEnumerator(); DataTable dt=GetTabType(TableName); System.Data.OracleClient.OracleType otype; int i=0; int size=0; // 作哈希表循环 while ( et.MoveNext() ) { GetoType(et.Key.ToString().ToUpper(),dt, out otype, out size); System.Data.OracleClient.OracleParameter op=MakeParam( ":" +et.Key.ToString(),et.Value.ToString()); Parms[i]=op; // 添加SqlParameter对象 i=i+1; } string str_Sql=GetDelSqlbyHt(TableName,ht_Where,ht); // 获得删除sql语句 int val=ExecuteNonQuery(str_Sql,Parms); return val; } #endregion // =========================================== // ========上面三个操作的内部调用函数================== // =========================================== #region 根据哈稀表及表名自动生成相应insert语句(参数类型的) /// <summary> /// 根据哈稀表及表名自动生成相应insert语句 /// </summary> /// <param name="TableName">要插入的表名</param> /// <param name="ht">哈稀表</param> /// <returns>返回sql语句</returns> public static string GetInsertSqlbyHt( string TableName,Hashtable ht) { string str_Sql= "" ; int i=0; int ht_Count=ht.Count; // 哈希表个数 IDictionaryEnumerator myEnumerator = ht.GetEnumerator(); string before= "" ; string behide= "" ; while ( myEnumerator.MoveNext() ) { if (i==0) { before= "(" +myEnumerator.Key; } else if (i+1==ht_Count) { before=before+ "," +myEnumerator.Key+ ")" ; } else { before=before+ "," +myEnumerator.Key; } i=i+1; } behide= " Values" +before.Replace( "," , ",:" ).Replace( "(" , "(:" ); str_Sql= "Insert into " +TableName+before+behide; return str_Sql; } #endregion #region 根据表名,where条件,哈稀表自动生成更新语句(参数类型的) public static string GetUpdateSqlbyHt( string Table, string ht_Where,Hashtable ht) { string str_Sql= "" ; int i=0; int ht_Count=ht.Count; // 哈希表个数 IDictionaryEnumerator myEnumerator = ht.GetEnumerator(); while ( myEnumerator.MoveNext() ) { if (i==0) { if (ht_Where.ToString().ToLower().IndexOf((myEnumerator.Key+ "=:" +myEnumerator.Key).ToLower())==-1) { str_Sql=myEnumerator.Key+ "=:" +myEnumerator.Key; } } else { if (ht_Where.ToString().ToLower().IndexOf(( ":" +myEnumerator.Key+ " " ).ToLower())==-1) { str_Sql=str_Sql+ "," +myEnumerator.Key+ "=:" +myEnumerator.Key; } } i=i+1; } if (ht_Where== null || ht_Where.Replace( " " , "" )== "" ) // 更新时候没有条件 { str_Sql= "update " +Table+ " set " +str_Sql; } else { str_Sql= "update " +Table+ " set " +str_Sql+ " where " +ht_Where; } str_Sql=str_Sql.Replace( "set ," , "set " ).Replace( "update ," , "update " ); return str_Sql; } #endregion #region 根据表名,where条件,哈稀表自动生成del语句(参数类型的) public static string GetDelSqlbyHt( string Table, string ht_Where,Hashtable ht) { string str_Sql= "" ; int i=0; int ht_Count=ht.Count; // 哈希表个数 IDictionaryEnumerator myEnumerator = ht.GetEnumerator(); while ( myEnumerator.MoveNext() ) { if (i==0) { if (ht_Where.ToString().ToLower().IndexOf((myEnumerator.Key+ "=:" +myEnumerator.Key).ToLower())==-1) { str_Sql=myEnumerator.Key+ "=:" +myEnumerator.Key; } } else { if (ht_Where.ToString().ToLower().IndexOf(( ":" +myEnumerator.Key+ " " ).ToLower())==-1) { str_Sql=str_Sql+ "," +myEnumerator.Key+ "=:" +myEnumerator.Key; } } i=i+1; } if (ht_Where== null || ht_Where.Replace( " " , "" )== "" ) // 更新时候没有条件 { str_Sql= "Delete " +Table; } else { str_Sql= "Delete " +Table+ " where " +ht_Where; } return str_Sql; } #endregion #region 生成oracle参数 /// <summary> /// 生成oracle参数 /// </summary> /// <param name="ParamName">字段名</param> /// <param name="otype">数据类型</param> /// <param name="size">数据大小</param> /// <param name="Value">值</param> /// <returns></returns> public static OracleParameter MakeParam( string ParamName,System.Data.OracleClient.OracleType otype, int size,Object Value) { OracleParameter para= new OracleParameter(ParamName,Value); para.OracleType=otype; para.Size=size; return para; } #endregion #region 生成oracle参数 public static OracleParameter MakeParam( string ParamName, string Value) { return new OracleParameter(ParamName, Value); } #endregion #region 根据表结构字段的类型和长度拼装oracle sql语句参数 public static void GetoType( string key,DataTable dt, out System.Data.OracleClient.OracleType otype, out int size) { DataView dv=dt.DefaultView; dv.RowFilter= "column_name='" +key+ "'" ; string fType=dv[0][ "data_type" ].ToString().ToUpper(); switch (fType) { case "DATE" : otype= OracleType.DateTime; size= int .Parse(dv[0][ "data_length" ].ToString()); break ; case "CHAR" : otype= OracleType.Char; size= int .Parse(dv[0][ "data_length" ].ToString()); break ; case "LONG" : otype= OracleType.Double; size= int .Parse(dv[0][ "data_length" ].ToString()); break ; case "NVARCHAR2" : otype= OracleType.NVarChar; size= int .Parse(dv[0][ "data_length" ].ToString()); break ; case "VARCHAR2" : otype= OracleType.NVarChar; size= int .Parse(dv[0][ "data_length" ].ToString()); break ; default : otype= OracleType.NVarChar; size=100; break ; } } #endregion #region动态 取表里字段的类型和长度,此处没有动态用到connstr,是默认的!by/文少 public System.Data.DataTable GetTabType( string tabnale) { string sql= "select column_name,data_type,data_length from all_tab_columns where table_name='" +tabnale.ToUpper()+ "'" ; OpenConn(); return (ReturnDataSet(sql, "dv" )).Tables[0]; } #endregion #region 执行sql语句 public int ExecuteNonQuery( string cmdText, params OracleParameter[] cmdParms) { OracleCommand cmd = new OracleCommand(); OpenConn(); cmd.Connection=Connection; cmd.CommandText = cmdText; if (cmdParms != null ) { foreach (OracleParameter parm in cmdParms) cmd.Parameters.Add(parm); } int val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); // conn.CloseConn(); return val; } #endregion // ===================================== // =========内部调用函数完==================== // ==================================== } } |
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