最近做项目，要跟对方系统的库进行读写，结果发现对方采用的是oracle的us7ascii编码，我们系统默认采用的是ZHS16GBK，导致我们客户端读取和写入对方库的数据都是乱码，搜索网上，发现需要采用独立的oracle驱动去处理，最后采用Devart驱动，可以指定字符集编码
添加引用2个DLL：
数据库操作代码如下：（查询）
cs
using System;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Xml;
using Devart.Data.Oracle;
namespace WindowsOrcleDevart
{
/// <summary>
/// 使用OracleDevart驱动
/// </summary>
public class ProviderDevart
{
private OracleConnection dbConnection;
private OracleTransaction dbTransaction;
private string _strConn = "";
private string path = AppDomain.CurrentDomain.BaseDirectory + "logs\\调用数据库";
public string Err = "";
public string StrConn { get => _strConn; set => _strConn = value; }
public int BeginTransaction()
{
//this.Err = "";
int result = -1;
try
{
GetSingerConnection();
this.dbTransaction = this.dbConnection.BeginTransaction();
result = 1;
}
catch (Exception message)
{
this.dbTransaction.Dispose();
this.dbTransaction = null;
Err = "开始事务异常，" + message.Message;
WriteLog(path, Err);
}
return result;
}
// 定义一个静态变量来保存类的实例
private static ProviderDevart s_instance;
/// <summary>
/// 定义公有方法提供一个全局访问点,同时你也可以定义公有属性来提供全局访问点
/// </summary>
/// <returns></returns>
public static ProviderDevart Instance
{
// 当第一个线程运行到这里时，此时会对locker对象 "加锁"，
// 当第二个线程运行该方法时，首先检测到locker对象为"加锁"状态，该线程就会挂起等待第一个线程解锁
// lock语句运行完之后（即线程运行完之后）会对该对象"解锁"
// 双重锁定只需要一句判断就可以了
get
{
if (s_instance == null)
{
lock (locker)
{
if (s_instance == null)
{
s_instance = new ProviderDevart();
}
}
}
return s_instance;
}
}
#region 单例锁 定义一个标识确保线程同步
private static readonly object locker = new object();
#endregion
private void GetSingerConnection()
{
if (this.dbConnection != null)
{
if (dbConnection.State != ConnectionState.Open)
{
dbConnection.Open();
}
}
else
{
this.dbConnection = new OracleConnection(_strConn);
this.dbConnection.Open();
}
}
public int TransactionCommit()
{
//this.Err = "";
int result = -1;
try
{
GetSingerConnection();
if (this.dbTransaction != null)
{
this.dbTransaction.Commit();
this.dbTransaction.Dispose();
this.dbTransaction = null;
}
result = 1;
}
catch (Exception message)
{
if (this.dbTransaction != null)
{
this.dbTransaction.Dispose();
this.dbTransaction = null;
}
Err = "提交事务异常，" + message.Message;
WriteLog(path, Err);
}
return result;
}
public int TransactionRollBack()
{
//this.Err = "";
int result = -1;
try
{
GetSingerConnection();
if (this.dbTransaction != null)
{
this.dbTransaction.Rollback();
this.dbTransaction.Dispose();
this.dbTransaction = null;
}
result = 1;
}
catch (Exception message)
{
if (this.dbTransaction != null)
{
this.dbTransaction.Dispose();
this.dbTransaction = null;
}
Err = "回滚事务异常，" + message.Message;
WriteLog(path, Err);
}
return result;
}
/// <summary>
/// 插入/更新/删除表数据
/// </summary>
/// <param name="strSql"></param>
/// <returns>返回SQL执行的影响行数，返回-1表示出现了内部错误</returns>
public int ExecuteNonQuery(string strSql)
{
//this.Err = "";
OracleGlobalization applicationInfo = OracleGlobalization.GetApplicationInfo();
applicationInfo.ClientCharacterSet = "us7ascii";
OracleGlobalization.SetApplicationInfo(applicationInfo);
int result = -1;
try
{
GetSingerConnection();
WriteLog(path, " 开始");
WriteLog(path, "strConn:" + _strConn);
WriteLog(path, "strSql:" + strSql);
if (_strConn == "" || strSql == "")
{
Err = "strConn 或 strSql 为空，无法执行!";
}
else
{
OracleCommand cmd = dbConnection.CreateCommand();
if (this.dbTransaction != null)
{
cmd.Transaction = this.dbTransaction;
}
cmd.CommandText = strSql;
result = cmd.ExecuteNonQuery();
}
}
catch (Exception ex)
{
Err = "插入更新数据异常，" + ex.Message;
WriteLog(path, Err);
}
WriteLog(path, " 结束");
return result;
}
/// <summary>
/// 查询表数据
/// </summary>
/// <param name="strSql">SQL语句</param>
/// <param name="data">返回数据为DataTable</param>
/// <returns></returns>
public int FillDataTable(string strSql, out DataTable data)
{
//this.Err = "";
data = new DataTable();
OracleGlobalization applicationInfo = OracleGlobalization.GetApplicationInfo();
applicationInfo.ClientCharacterSet = "us7ascii";
OracleGlobalization.SetApplicationInfo(applicationInfo);
int result = -1;
OracleCommand oleDbCommand = null;
try
{
GetSingerConnection();
WriteLog(path, " 开始");
WriteLog(path, "strConn:" + _strConn);
WriteLog(path, "strSql:" + strSql);
oleDbCommand = new OracleCommand(strSql, dbConnection);
oleDbCommand.CommandType = CommandType.Text;
using (OracleDataAdapter oleDbDataAdapter = new OracleDataAdapter(oleDbCommand))
{
DataSet ds = new DataSet();
oleDbDataAdapter.Fill(ds, "ReturnTable");
if (ds != null && ds.Tables.Count > 0)
{
data = ds.Tables[0];
}
}
result = 1;
}
catch (Exception ex)
{
Err = "查询数据异常，" + ex.Message;
WriteLog(path, Err);
}
WriteLog(path, " 结束");
return result;
}
private bool dbClose(OracleConnection conn, OracleCommand cmd, OracleTransaction tran)
{
bool result;
if (cmd != null)
{
cmd.Dispose();
GC.Collect();
result = false;
}
else if (conn != null)
{
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
conn.Dispose();
GC.Collect();
result = true;
}
else
{
GC.Collect();
result = false;
}
return result;
}
public void WriteLog(string filePath, string message)
{
try
{
if (!Directory.Exists(filePath))
{
Directory.CreateDirectory(filePath);
}
string fileName = filePath + "\\" + DateTime.Now.ToString("yyyy-MM-dd") + ".log";
string msg = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:") + DateTime.Now.Millisecond + " " + message;
System.IO.StreamWriter sw = System.IO.File.AppendText(fileName);
sw.WriteLine(msg);
sw.Close();
}
catch
{
}
}
}
}客户端访问示例：
cs
private void button1_Click(object sender, EventArgs e)
{
ProviderDevart providerDevart = ProviderDevart.Instance;
providerDevart.StrConn = "data source=XXX.XX.8.X:1521/orcl;user id=#####;password=######;";
providerDevart.FillDataTable("SELECT '测试数据' as T1 FROM DUAL ",out DataTable dt);
MessageBox.Show(dt.Rows[0]["T1"].ToString());
}源码，压缩包见地址：