在java应用程序中与oracle连接 [英] Connection with oracle in java application

问题描述

我已经下载了oracle express 11g版本并安装了。现在我想从java应用程序连接它。这是我的连接代码： -

I have downloaded oracle express 11g edition and installed that.Now i want to connect it from java application. Here is my Connection code :-

Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:example", "example","password123");

但是当我试图连接它，它显示我以下异常。

But when i am trying to connect it, it showing me following exception.

java.sql.SQLException: Listener refused the connection with the following error:  
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:419)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:536)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:228)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:521)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at javaapplication3.JavaApplication3.main(JavaApplication3.java:40)

但是当我试图与xe数据库连接时，它是连接。

But when i am trying to connect with "xe" database then it is connected.

Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();   
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "example","password123");

我不知道为什么会发生这种情况。请给我一些参考或提示。

I dont know why this is happening?. Please give me some reference or hint.

推荐答案

我想你不能理解数据库模式类型。在oracle数据库的 Oracle ， XE 表示 Express Edition ORCL 表示 Oracle Corp 。

I think, you are miss understanding between database schema and database type. In Oracle, XE mean Express Edition of oracle database. ORCL mean Oracle Corp.

In mysql

DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "example","password123");

`test` is a database schema.

在Oracle XE中

In Oracle XE

DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "example","password123");
DriverManager.getConnection("jdbc:oracle:thin:scott/tiger@myhost:1521:orcl","example", "password123");

`example`, database schema name and DB user name are the same.

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