How to configure and manage connection parameters for Java database connections?

Connection parameters Specify connection parameters when configuring and managing connections, including database URL, username and password. Specify parameters through code settings or connection strings. Connection parameters can be obtained through the Connection object, but setting the parameters may require re-creating the connection. Hikari connection pool can be used to manage connection parameters to avoid repeated settings.

Java Database Connection: Configuring and Managing Connection Parameters

Configuring Connection Parameters

When connecting to the database, you need to specify some connection parameters. Such as database URL, username and password. These parameters can be configured via:

1. Set the connection parameters via code:

   String url = "jdbc:postgresql://localhost:5432/test";
   String username = "postgres";
   String password = "mypassword";
   
   Connection conn = DriverManager.getConnection(url, username, password);

2. via connection String specified parameters:

   String connectionString = "jdbc:postgresql://localhost:5432/test" +
                              "?user=postgres" +
                              "&password=mypassword";
   
   Connection conn = DriverManager.getConnection(connectionString);

Manage connection parameters

Get connection parameters

You can use The getConnection() method gets the connection parameters from the Connection object:

DatabaseMetaData metadata = conn.getMetaData();
String url = metadata.getURL();
String username = metadata.getUserName();

Set the connection parameters

Note: Most database drivers do not support setting connection parameters directly, so the connection may need to be recreated to apply changes.

Practical case

Use Hikari connection pool to manage connection parameters

Hikari connection pool is a Java library that can be used to optimize database connection management. It allows you to specify connection parameters by configuring the DataSource object:

import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;

HikariConfig config = new HikariConfig();
config.setJdbcUrl("jdbc:postgresql://localhost:5432/test");
config.setUsername("postgres");
config.setPassword("mypassword");
config.setAutoCommit(false); // 启用事务

HikariDataSource ds = new HikariDataSource(config);

Get the connection from the connection pool and use the connection parameters

Connection conn = ds.getConnection();
Statement stmt = conn.createStatement();

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