本文所述为C#实现的Oracle数据库操作类，可执行超多常用的Oracle数据库操作，包含了基础数据库连接、关闭连接、输出记录集、执行Sql语句，返回带分页功能的dataset 、取表里字段的类型和长度等，同时还有哈稀表自动插入数据库等高级任务。需要特别指出的是：在执行SQL语句，返回 DataReader之前一定要先用.read()打开,然后才能读到数据，再用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"。
完整的C# Oracle数据库类实例代码如下：
using System;
using System.Data;
using System.Data.OracleClient;
using System.Collections;
using System.Reflection;
namespace MyOraComm
{
/// ConnDbForOracle 的摘要说明。
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
/// 带参数的构造函数
/// 数据库联接字符串
public ConnForOracle(string ConnString)
{
string connStr;
connStr = System.Configuration.ConfigurationSettings.AppSettings[ConnString].ToString();
Connection = new OracleConnection(connStr);
}
#endregion
#region 打开数据库
/// 打开数据库
public void OpenConn()
{
if(this.Connection.State!=ConnectionState.Open)
this.Connection.Open();
}
#endregion
#region 关闭数据库联接
/// 关闭数据库联接
public void CloseConn()
{
if(Connection.State==ConnectionState.Open)
Connection.Close();
}
#endregion
#region 执行SQL语句，返回数据到DataSet中
/// 执行SQL语句，返回数据到DataSet中
/// sql语句
/// 自定义返回的DataSet表名
/// 返回DataSet
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
/// 执行Sql语句,返回带分页功能的dataset
/// Sql语句
/// 每页显示记录数
///
/// 返回dataset表名
/// 返回DataSet
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
/// 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
/// sql语句
/// 返回一个OracleDataReader
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
/// 执行SQL语句，返回记录总数数
/// sql语句
/// 返回记录总条数
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
///
/// 取当前序列
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
/// 执行SQL语句,返回所影响的行数
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)
/// 根据哈稀表及表名自动生成相应insert语句
/// 要插入的表名
/// 哈稀表
/// 返回sql语句
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
///
/// 生成oracle参数
/// 字段名
/// 数据类型
/// 数据大小
/// 值
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
}
}使用时可将上述代码保存成oracle_dbconn.cs文件，再进行调用。