Java数据库开发(二)之——DBCP连接数据库

1.载入jar包

DBCP需要以下几个jar包，可到apache及mysql的官网下载

2.程序编写

public static BasicDataSource ds = null;

static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost:3306/jdbc?useSSL=false";
static final String USER = "root";
static final String PASSWORD = "123456";

//创建DBCP连接池
public static void dbPoolInit() {
    ds = new BasicDataSource();
    ds.setUrl(DB_URL);
    ds.setDriverClassName(JDBC_DRIVER);
    ds.setUsername(USER);
    ds.setPassword(PASSWORD);
}

//使用DBCP连接数据库
public void dbPoolTest() {
    Connection conn = null;
    Statement stmt = null;
    ResultSet rs = null;

    try {
        conn = ds.getConnection();
        stmt = conn.createStatement();
        rs = stmt.executeQuery("select userName from user");
        while (rs.next()) {
            System.out.println("Hello " + rs.getString("userName"));
        }
    } catch (SQLException e) {
        e.printStackTrace();
    } finally {
        try {
            if (conn != null) conn.close();
            if (stmt != null) stmt.close();
            if (rs != null) rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

}

3.高级配置

4.DBCP定期检查