在java应用程序中与oracle连接

Question

我已经下载了Oracle快捷11克版并安装that.Now我想将它从Java应用程序连接.这是我的连接代码: -

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时,它会向我显示以下异常.

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.

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.

Answer 1

我想,你database schema和数据库类型之间存在误解.在Oracle,oracle数据库的XE手段Express Edition.ORCL手段Oracle Corp.

在mysql中

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

`test` is a database schema.

在Oracle XE中

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.

Answer 2

Oracle 的连接 URL 格式如下：

jdbc:oracle:thin:@HOST:PORT:SID

SID 是站点标识符。在完整的 oracle 安装中，您可以有多个 SID，但对于 Oracle Express，这将始终是XE.

您所指的“数据库”等同于 Oracle 中的“用户”（上面代码中的“示例”）。表等...是在该用户下创建的。