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.
using System;
using System.Data;
using System.Data.OracleClient;
using System.Collections;
using System.Reflection;
namespace MyOraComm
{
///
#region 打开数据库
///
#region 执行SQL语句,返回数据到DataSet中
///
#region 执行Sql语句,返回带分页功能的dataset
///
#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
///
#region 执行SQL语句,返回记录总数数
///
#region 取当前序列,条件为seq.nextval或seq.currval
///
#region 执行SQL语句,返回所影响的行数
///
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)
///
#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
///
#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====================