java - 自定义 JDBC 驱动程序

Question

我正在编写自己的自定义 JDBC 驱动程序。我想知道如何在客户端代码中配置要传递给 DriverManager.getConnection 的 URL 前缀(即，使用 mysql 连接器时相当于 jdbc:mysql)？我似乎一直收到 java.sql.SQLException: No suitable driver found。我的代码目前如下所示:

static
{
    try
    {
        CustomDriver driverInst = new CustomDriver();
        DriverManager.registerDriver(driverInst);
    }
    catch (Exception e) { e.printStackTrace(); }
}

public CustomDriver () throws SQLException 
{
    super();
}

@Override
public Connection connect (String url, Properties info) throws SQLException
{
    // this is never called
    return null;
}

测试代码:

      Class.forName("CustomDriver");

      System.out.println("Connecting to database...");
      conn = DriverManager.getConnection("customDriver://localhost/testdb"); 
      // throws SQLException

Answer 1

你需要实现Driver.boolean acceptsURL(String url)

/**
 * Retrieves whether the driver thinks that it can open a connection
 * to the given URL.  Typically drivers will return <code>true</code> if they
 * understand the subprotocol specified in the URL and <code>false</code> if
 * they do not.
 *
 * @param url the URL of the database
 * @return <code>true</code> if this driver understands the given URL;
 *         <code>false</code> otherwise
 * @exception SQLException if a database access error occurs
 */
boolean acceptsURL(String url) throws SQLException;