spring配置数据源

• 导入数据源jar
• 创建数据源对象
• 设置数据源的基本连接数据
• 使用数据源获取连接资源和归还资源

  mysql
  mysql-connector-java
  8.0.28



  c3p0
  c3p0
  0.9.1.2


  com.alibaba
  druid
  1.1.12


  junit
  junit
  4.11
  test

//jdbc.driver=com.mysql.cj.jdbc.Driver
//jdbc.url=jdbc:mysql://localhost:3306/mysql
//jdbc.username=root
//jdbc.password=123456
public class DataSourceTest {
    // 手动创建c3p0数据源
    @Test
    public void test1() throws PropertyVetoException, SQLException {
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass("com.mysql.cj.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/mysql");
        dataSource.setUser("root");
        dataSource.setPassword("123456");
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        connection.close();
    }

    // 手动创建druid数据源
    @Test
    public void test2() throws SQLException {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/mysql");
        dataSource.setUsername("root");
        dataSource.setPassword("123456");
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        connection.close();
    }

    // 读取配置文件
    @Test
    public void test3() throws PropertyVetoException, SQLException {
        // 读取配置
        ResourceBundle rb = ResourceBundle.getBundle("jdbc");
        //
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass(rb.getString("jdbc.driver"));
        dataSource.setJdbcUrl(rb.getString("jdbc.url"));
        dataSource.setUser(rb.getString("jdbc.username"));
        dataSource.setPassword(rb.getString("jdbc.password"));
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        connection.close();
    }