How to connect to oracle database

Connecting to Oracle database requires the following steps: Obtain connection information (host name, port number, service name, user name, password) Select the connection method (SQL*Plus, SQL Developer, JDBC, ODBC) Use the corresponding method to establish a connection

How to connect to an Oracle database

Connecting to an Oracle database requires the following steps:

1. Get connection information

• Hostname or IP address: The hostname or IP address of the database server.
• Port number: The port the database is listening on, the default value is 1521.
• Service Name: The service name of the database to which you want to connect to.
• Username: Username for logging into the database.
• Password: Password to log in to the database.

2. Select the connection method

There are several ways to connect to an Oracle database:

• SQL*Plus: Command line interface tool provided by Oracle.
• SQL Developer: A graphical interface tool provided by Oracle.
• JDBC: API for Java applications to interact with databases.
• ODBC: API for other applications to interact with databases.

3. Connect using SQL*Plus

To connect to the database using SQL*Plus, use the following syntax:

 <code>sqlplus 用户名/密码@[主机名[:端口号]/服务名称]</code>

For example:

 <code>sqlplus scott/tiger@localhost:1521/ORCL</code>

4. Connect using SQL Developer

To connect to the database using SQL Developer, follow these steps:

• Open SQL Developer and click Connect.
• Enter a name for the connection in the Connection Name field.
• Enter login information in the Username and Password fields.
• Enter the host name and port number of the database server in the Host Name and Port fields.
• Enter a service name in the Service Name field.
• Click the "Test" button to verify that the connection is successful.
• Click the "Save" button to save the connection.

5. Connect using JDBC

Using JDBC to connect to the database, you need to import the java.sql package and use the following code:

 <code class="java">// 加载驱动程序类Class.forName("oracle.jdbc.driver.OracleDriver"); // 建立连接URL String url = "jdbc:oracle:thin:@[主机名[:端口号]/服务名称]"; // 创建连接对象Connection conn = DriverManager.getConnection(url, "用户名", "密码");</code>

6. Connect using ODBC

To connect to the database using ODBC, you need to configure the ODBC data source. For detailed instructions on how to configure an ODBC data source, see the ODBC documentation.

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