c#操作oracle的通用类

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using DDTek.Oracle;
using System.Configuration;
namespace Common
{

//// <summary>
/// OracleHelper 的摘要说明。
/// </summary>
public class OracleHelper
{
protected OracleConnection Connection;
private string connectionString;
public OracleHelper()
{
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 OracleHelper(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);
OracleDbType 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);
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);
OracleDbType 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);
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;
}

public int Update(string TableName, string ht_Where, Hashtable ht,OracleConnection oraConn)
{
OracleParameter[] Parms = new OracleParameter[ht.Count];
IDictionaryEnumerator et = ht.GetEnumerator();
DataTable dt = GetTabType(TableName);
OracleDbType 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);
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, oraConn, 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);
OracleDbType 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);
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, OracleDbType otype, int size, Object Value)
{
OracleParameter para = new OracleParameter(ParamName, Value);
para.OracleDbType = 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 OracleDbType 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 = OracleDbType.Timestamp;
size = int.Parse(dv[0]["data_length"].ToString());
break;
case "CHAR":
otype = OracleDbType.Char;
size = int.Parse(dv[0]["data_length"].ToString());
break;
case "LONG":
otype = OracleDbType.Double;
size = int.Parse(dv[0]["data_length"].ToString());
break;
case "NVARCHAR2":
otype = OracleDbType.NVarChar;
size = int.Parse(dv[0]["data_length"].ToString());
break;
case "VARCHAR2":
otype = OracleDbType.NVarChar;
size = int.Parse(dv[0]["data_length"].ToString());
break;
default:
otype = OracleDbType.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;
}

public int ExecuteNonQuery(string cmdText, OracleConnection oraConn, params OracleParameter[] cmdParms)
{
OracleCommand cmd = new OracleCommand();
cmd.Connection = oraConn;
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＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
//　＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
}

}