Java JDBC Thin Dr…

一.JDBC 连接Oracle 说明

http://www.cnblogs.com/zhangliang0115/archive/2012/02/18/2357097.html

JDBC 的应用连接Oracle 遇到问题，错误如下：

ORA-12505,TNS:listener does not currently know of SID given in
connect descriptor TheConnection descriptor used by the client
was。

我在DB 层面配置了静态注册，并且GLOBAL_DBNAME和SID_NAME
不一样，以往的配置都是一样的，所以没有发现这个问题。

(SID_DESC
=

(GLOBAL_DBNAME
= dave)

(ORACLE_HOME
=D:\app\Administrator\product\11.2.0\dbhome_1)

(SID_NAME
= NEWCCS)

)

Oracle Listener 动态注册 与 静态注册
http://blog.csdn.net/tianlesoftware/article/details/5543166
在网上google 了一下，发现JDBC Thin Driver 的formats 有三种格式：

格式一: Oracle
JDBC Thin using a ServiceName:

jdbc:oracle:thin:@//:/

Example: jdbc:oracle:thin:@//192.168.2.1:1521/XE

注意这里的格式，@后面有//, 这是与使用SID的主要区别。

这种格式是Oracle 推荐的格式，因为对于集群来说，每个节点的SID 是不一样的，但是SERVICE_NAME
确可以包含所有节点。

格式二: Oracle
JDBC Thin using an SID:

jdbc:oracle:thin:@::

Example:
jdbc:oracle:thin:192.168.2.1:1521:X01A

Note: Support for SID is being phased out. Oracle recommends that
users switch over to usingservice names.

格式三：Oracle
JDBC Thin using a TNSName:

jdbc:oracle:thin:@

Example: jdbc:oracle:thin:@GL

Note:

Support for TNSNames was added in the driver release 10.2.0.1

二.测试

2.1 准备工作：

Oracle 是11gR2

Listener.ora

SID_LIST_LISTENER =

(SID_LIST =

(SID_DESC
=

(GLOBAL_DBNAME
= dave)

(ORACLE_HOME
=D:\app\Administrator\product\11.2.0\dbhome_1)

(SID_NAME
= NEWCCS)

)

)

Tnsnames.ora

DVD =

(DESCRIPTION =

(ADDRESS_LIST
=

(ADDRESS
= (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))

)

(CONNECT_DATA
=

(SERVICE_NAME
= dave)

)

)

2.2 测试1，使用SID:newccs

[java] view
plaincopy

import java.sql.*;

public class jdbc {

String dbUrl = "jdbc:oracle:thin:@127.0.0.1:1521:newccs";

String theUser = "dave";

String thePw = "dave";

Connection c = null;

Statement conn;

ResultSet rs = null;

public jdbc() {

try {

Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

c = DriverManager.getConnection(dbUrl, theUser, thePw);

conn = c.createStatement();

} catch (Exception e) {

e.printStackTrace();

}

}

public boolean executeUpdate(String sql) {

try {

conn.executeUpdate(sql);

return true;

} catch (SQLException e) {

e.printStackTrace();

return false;

}

}

public ResultSet executeQuery(String sql) {

rs = null;

try {

rs = conn.executeQuery(sql);

} catch (SQLException e) {

e.printStackTrace();

}

return rs;

}

public void close() {

try {

conn.close();

c.close();

} catch (Exception e) {

e.printStackTrace();

}

}

public static void main(String[] args) {

ResultSet rs;

jdbc conn = new jdbc();

rs = conn.executeQuery("select * from dave where rownum<5");

try {

while (rs.next()) {

System.out.println(rs.getString("username")+"--"+rs.getString("user_id"));

}

} catch (Exception e) {

e.printStackTrace();

}

}

}

---输出正常：

MGMT_VIEW--97

ANQING--94

DVD--93

SYSMAN--95

2.3 使用 service_name：dave

将2.2 节的dbUrl 改成如下：

String dbUrl = "jdbc:oracle:thin:@//127.0.0.1:1521/dave";

输出结果：

MGMT_VIEW--97

ANQING--94

DVD--93

SYSMAN--95

如果在11g里遇到如下错误：

测试运行Java 类，报错：

java.sql.SQLException: The Network Adapter could not
establish the connection

可以尝试更换对应的 jdbc connection driver，官网的说明如下：

JDBC Thin Driver 11g Causes"Java.Sql.Sqlexception: Io Exception:
The Network Adapter Could NotEstablish The Connection" While
Connecting to Oracle Database 11g [ID947653.1]

Change the JDBC connection driver class inyour application
server from:

oracle.jdbc.driver.OracleDriver

to

oracle.jdbc.OracleDriver

2.4 使用TNS name： dvd

String dbUrl = "jdbc:oracle:thin:@dvd";

报错如下：

java.sql.SQLException: Unknown host specified

该问题是因为JVM 没有oracle.net.tns_admin的system
property。 解决方法有2种：

方法一：在启动VM 时添加如下参数：

-Doracle.net.tns_admin=D:\app\Administrator\product\11.2.0\dbhome_1\NETWORK\ADMIN


JDBC Thin Driver 连接 Oracle 三种方法说明" />

方法二：在java 代码里添加：

System.setProperty("oracle.net.tns_admin","D:\\app\\Administrator\\product\\11.2.0\\dbhome_1\\NETWORK\\ADMIN");

添加之后，就可以正常在JDBC中使用tnsnama了。


[java] view
plaincopy

import java.sql.*;

public class jdbc {

String dbUrl = "jdbc:oracle:thin:@dvd";

// String dbUrl = "jdbc:oracle:thin:@//127.0.0.1:1521/dave";

// String dbUrl = "jdbc:oracle:thin:@127.0.0.1:1521:newccs";

String theUser = "dave";

String thePw = "dave";

Connection c = null;

Statement conn;

ResultSet rs = null;

public jdbc() {

try {

System.setProperty("oracle.net.tns_admin","D:\\app\\Administrator\\product\\11.2.0\\dbhome_1\\NETWORK\\ADMIN");

Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

// Class.forName("oracle.jdbc.OracleDriver").newInstance();

c = DriverManager.getConnection(dbUrl, theUser, thePw);

conn = c.createStatement();

} catch (Exception e) {

e.printStackTrace();

}

}

public boolean executeUpdate(String sql) {

try {

conn.executeUpdate(sql);

return true;

} catch (SQLException e) {

e.printStackTrace();

return false;

}

}

public ResultSet executeQuery(String sql) {

rs = null;

try {

rs = conn.executeQuery(sql);

} catch (SQLException e) {

e.printStackTrace();

}

return rs;

}

public void close() {

try {

conn.close();

c.close();

} catch (Exception e) {

e.printStackTrace();

}

}

public static void main(String[] args) {

ResultSet rs;

jdbc conn = new jdbc();

rs = conn.executeQuery("select * from dave where rownum<5");

try {

while (rs.next()) {

System.out.println(rs.getString("username")+"--"+rs.getString("user_id"));

}

} catch (Exception e) {

e.printStackTrace();

}

}

}

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