如何使用 JDBC 获取驱动的属性?


可以使用 Driver 接口的 getPropertyInfo() 方法来获取驱动的属性。

DriverPropertyInfo[] info = driver.getPropertyInfo(mysqlUrl, null);

此方法接受两个参数:代表数据库 URL 的 String 变量、Properties 类的对象,并返回 DriverPropertyInfo 对象数组,其中每个对象都包含有关当前驱动程序的可能属性的信息。

DriverPropertyInfo 对象中,你可以获取有关属性名称、属性值、描述、选项以及是否必需等信息,使用其字段分别为 name、value、description、choices、required

DriverPropertyInfo[] info = driver.getPropertyInfo(mysqlUrl, null);
for (int i = 0; i < info.length; i++) {
   System.out.println("Property name: "+info[i].name);
   System.out.println("Property value: "+info[i].value);
   System.out.println("Property description: "+info[i].description);
   System.out.println("Choices: "+info[i].choices);
   System.out.println("Is Required: "+info[i].required);
   System.out.println(" ");
}

以下 JDBC 程序建立与 MySQL 数据库的连接,并获取当前驱动程序所需属性的名称、值、描述和选项。

示例

import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.DriverPropertyInfo;
public class DriverPropertyinfoExample {
   public static void main(String args[]) throws Exception {
      String mysqlUrl = "jdbc:mysql://127.0.0.1/sampledatabase";
      //Creating a Driver object of the MySQL database
      Driver driver = DriverManager.getDriver(mysqlUrl);
      //Registering the Driver
      DriverManager.registerDriver(driver);
      //Getting the connection
      Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
      System.out.println("Connection established: "+con);
      //Getting the properties of the current driver
      DriverPropertyInfo[] info = driver.getPropertyInfo(mysqlUrl, null);
      for (int i = 0; i < info.length; i++) {
         if(info[i].required) {
            System.out.print("Property name: "+info[i].name+", ");
            System.out.print("Property value: "+info[i].value+", ");
            System.out.print("Property description: "+info[i].description+", ");
            System.out.print("Choices: "+info[i].choices);
            System.out.println(" ");
         }
      }
   }
}

输出

Connection established: com.mysql.jdbc.JDBC4Connection@6d1e7682
Property name: HOST, Property value: localhost, Property description: Hostname of MySQL Server, Choices: null
Property name: user, Property value: null, Property description: Username to authenticate as, Choices: null
Property name: password, Property value: null, Property description: Password to use for authentication, Choices: null

更新于:30-Jul-2019

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