一、关于本文
运行本文中的代码，需要
1）需要手动添加引用System.Data.OracleClient
在代码最前面加入这句话：using System.Data.OracleClient;
2）需要安装 Instant Client
安装 Oracle Instant Client（OCI） 的步骤可以参考这篇文章
注：下载32位的OCI库，则在VS中需要选择x86作为目标平台；下载64位的OCI库，则需要选择x64作为目标平台
二、工具类OracleHelper代码
class OracleHelper
{
//需要 oci.dll oraociei12.dll oraons.dll
/// <summary>
/// 协议：默认TCP
/// </summary>
public static string PROTOCOL = "TCP";
/// <summary>
/// 主机地址：默认171.0.0.132
/// </summary>
public static string HOST = "171.0.0.132";
/// <summary>
/// 端口号：默认1521
/// </summary>
public static string PORT = "1521";
/// <summary>
/// TNS服务名：默认TESTDB
/// </summary>
public static string SERVICE_NAME = "TESTDB";
/// <summary>
/// 用户名：默认NQ_MON
/// </summary>
public static string USER_ID = "NQ_MON";
/// <summary>
/// 密码：默认NQ_MON
/// </summary>
public static string PASSWORD = "NQ_MON";
/// <summary>
/// 初始化工具类中各项属性
/// </summary>
/// <param name="PTC">协议：默认TCP</param>
/// <param name="HST">主机地址：默认171.0.0.132</param>
/// <param name="PRT">端口号：默认1521</param>
/// <param name="SRV">TNS服务名：默认TESTDB</param>
/// <param name="UID">用户名：默认NQ_MON</param>
/// <param name="PWD">密码：默认NQ_MON</param>
public static void InitializeConfig(
string PTC = "TCP",
string HST = "171.0.0.132",
string PRT = "1521",
string SRV = "TESTDB",
string UID = "NQ_MON",
string PWD = "NQ_MON")
{
PROTOCOL = PTC;
HOST = HST;
PORT = PRT;
SERVICE_NAME = SRV;
USER_ID = UID;
PASSWORD = PWD;
}
/// <summary>
/// 生成连接字符串
/// </summary>
/// <param name="PROTOCOL">协议</param>
/// <param name="HOST">主机地址</param>
/// <param name="PORT">端口号</param>
/// <param name="SERVICE_NAME">TNS服务名</param>
/// <param name="USER_ID">用户名</param>
/// <param name="PASSWORD">登录口令</param>
/// <returns></returns>
public static string GetConnectionString()
{
return string.Format(
"DATA SOURCE= " +
" (DESCRIPTION= " +
" (ADDRESS_LIST= " +
" (ADDRESS= " +
" (PROTOCOL={0}) " +
" (HOST={1}) " +
" (PORT={2}) " +
" ) " +
" ) " +
" (CONNECT_DATA= " +
" (SERVICE_NAME={3}) " +
" ) " +
" ); " +
"PERSIST SECURITY INFO=TRUE; " +
"USER ID={4}; " +
"PASSWORD={5} ",
PROTOCOL, HOST, PORT, SERVICE_NAME, USER_ID, PASSWORD);
}
/// <summary>
/// 向数据库中执行命令
/// </summary>
/// <param name="sqlExecute">无返回值SQL语句</param>
/// <returns>SQL语句影响的行数</returns>
public static int ExecuteCommand(string sqlExecute)
{
int lineschanged = 0;
//生成连接字符串
string conn = GetConnectionString();
//读取数据
using (OracleConnection oc = new OracleConnection(conn))
{
try
{
//打开连接
oc.Open();
OracleCommand cmd = oc.CreateCommand();
cmd.CommandText = sqlExecute;
lineschanged = cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
//输出异常后抛出
Console.WriteLine("Function ExecuteCommand: " + ex.Message);
throw new Exception(ex.Message);
}
finally
{
//关闭连接
oc.Close();
}
}
return lineschanged;
}
/// <summary>
/// 从数据库中查询数据
/// </summary>
/// <param name="sqlSearch">查询用SQL语句</param>
/// <returns></returns>
public static System.Data.DataTable SearchCommand(string sqlSearch)
{
//返回的DataTable
System.Data.DataTable dt = new System.Data.DataTable();
//生成连接字符串
string conn = GetConnectionString();
//读取数据
using (OracleConnection oc = new OracleConnection(conn))
{
try
{
//打开连接
oc.Open();
OracleCommand cmd = oc.CreateCommand();
cmd.CommandText = sqlSearch;
OracleDataReader odr = cmd.ExecuteReader();
//读取列信息
for (int i = 0; i < odr.FieldCount; i++)
{
dt.Columns.Add(odr.GetName(i));
}
//读取各行存入到DataTable中
while (odr.Read())
{
string[] s = new string[odr.FieldCount];
for (int i = 0; i < odr.FieldCount; i++)
{
s[i] = odr.GetValue(i).ToString();
}
dt.Rows.Add(s);
}
}
catch (Exception ex)
{
//输出异常后抛出
Console.WriteLine("Function SearchCommand: " + ex.Message);
throw new Exception(ex.Message);
}
finally
{
//关闭连接
oc.Close();
}
}
return dt;
}
}三、Main函数调用示例
namespace OracleTest
{
class Program
{
/// <summary>
/// 执行查询SQL语句示例
/// </summary>
public static void SearchTest()
{
//查询内容
Console.WriteLine("执行SEARCH语句");
System.Data.DataTable dt = OracleHelper.SearchCommand(
"SELECT CURR_DATE, CURR_TIME FROM MONCRITEVENT WHERE ROWNUM <= 10");
//输出查询结果
Console.WriteLine("输出查询结果");
for (int i = 0; i < dt.Rows.Count; i++)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
Console.Write(dt.Rows[i][j].ToString());
Console.Write('\t');
}
Console.WriteLine();
}
}
/// <summary>
/// 执行非查询SQL语句示例
/// </summary>
public static void CommandTest()
{
//执行SQL语句
Console.WriteLine("执行UPDATE语句");
int lineschanged = OracleHelper.ExecuteCommand(
"UPDATE MONCRITEVENT SET CURR_DATE = 9999 WHERE CURR_DATE = 9999");
Console.WriteLine("受影响的行数：" + lineschanged);
}
/// <summary>
/// 循环发送Search语句并返回
/// </summary>
/// <param name="second">每次收发数据间隔时间</param>
public static void SearchLoopTest(object second)
{
while (true)
{
SearchTest();
System.Threading.Thread.Sleep(int.Parse(second.ToString()));
}
}
static void Main(string[] args)
{
SearchTest(); //执行查询SQL语句示例
Console.WriteLine("--------");
CommandTest(); //执行非查询SQL语句示例
Console.WriteLine("--------");
//压力测试，执行时可以打开任务管理器辅助检测程序运行状况
//每0.2秒发送一次，分10个线程发送
/*
(new System.Threading.Thread(SearchLoopTest)).Start(2000); //1
System.Threading.Thread.Sleep(200);
(new System.Threading.Thread(SearchLoopTest)).Start(2000); //2
System.Threading.Thread.Sleep(200);
(new System.Threading.Thread(SearchLoopTest)).Start(2000); //3
System.Threading.Thread.Sleep(200);
(new System.Threading.Thread(SearchLoopTest)).Start(2000); //4
System.Threading.Thread.Sleep(200);
(new System.Threading.Thread(SearchLoopTest)).Start(2000); //5
System.Threading.Thread.Sleep(200);
(new System.Threading.Thread(SearchLoopTest)).Start(2000); //6
System.Threading.Thread.Sleep(200);
(new System.Threading.Thread(SearchLoopTest)).Start(2000); //7
System.Threading.Thread.Sleep(200);
(new System.Threading.Thread(SearchLoopTest)).Start(2000); //8
System.Threading.Thread.Sleep(200);
(new System.Threading.Thread(SearchLoopTest)).Start(2000); //9
System.Threading.Thread.Sleep(200);
(new System.Threading.Thread(SearchLoopTest)).Start(2000); //10
* */
Console.ReadLine();
}
}
}四、运行截图
END
来源：oschina
链接：https://my.oschina.net/u/1425762/blog/300170