在 Java 应用程序中与 oracle 连接

Connection with oracle in java application(在 Java 应用程序中与 oracle 连接)

问题描述

我已经下载并安装了 oracle express 11g 版本.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");

但是当我尝试连接它时，它显示我出现以下异常.

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)

但是当我尝试连接xe"数据库时，它已连接.

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");

我不知道为什么会这样?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，你对 database schema 和数据库类型有误解.在Oracle中，XE表示oracle数据库的Express Edition.ORCL 表示 Oracle 公司.

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

在mysql中

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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