关系型数据库(h2)

概述

纯Java实现开源关系数据库，支持嵌入式、服务器和混合三种运行模式，具备轻量化（约2MB JAR文件）和跨平台特性。该数据库采用多版本并发控制（MVCC）机制优化并发访问性能,支持SQL标准的大部分功能，并兼容MySQL语法。

maven依赖

xml 复制代码

<dependency>
    <groupId>com.h2database</groupId>
    <artifactId>h2</artifactId>
    <version>2.1.210</version>
</dependency>

示例

内存模式

java 复制代码

    @Test
    void contextLoads() throws ClassNotFoundException, SQLException {
        Class.forName("org.h2.Driver");
        Connection connection = DriverManager.getConnection("jdbc:h2:mem:test");
        Statement statement = connection.createStatement();
        //创建表
        statement.execute("create table tb_demo(id integer not null, name TEXT);");
        //插入数据
        statement.execute("insert into tb_demo(id,name) values (1,'bob');");
        statement.execute("insert into tb_demo(id,name) values (2,'pop');");
        //查询数据
        ResultSet resultSet = statement.executeQuery("select * from tb_demo");
        while (resultSet.next()) {
            int id = resultSet.getInt("id");
            String name = resultSet.getString("name");
            System.out.println("id: " + id + "   name: " + name);
        }
    }

文件模式

java 复制代码

    @Test
    void contextLoads1() throws ClassNotFoundException, SQLException {
        Class.forName("org.h2.Driver");
        //文件模式，会将数据库文件存储在指定位置。配置数据库文件生成会自动加 .mv.db 后缀名
        Connection connection = DriverManager.getConnection("jdbc:h2:file:E:\\db\\h2");
        Statement statement = connection.createStatement();
        //创建表
        statement.execute("create table tb_demo(id integer not null, name TEXT);");
        //插入数据
        statement.execute("insert into tb_demo(id,name) values (1,'bob');");
        statement.execute("insert into tb_demo(id,name) values (2,'pop');");
        //查询数据
        ResultSet resultSet = statement.executeQuery("select * from tb_demo");
        while (resultSet.next()) {
            int id = resultSet.getInt("id");
            String name = resultSet.getString("name");
            System.out.println("id: " + id + "   name: " + name);
        }
    }

可参考文档

官网