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| <h1 id="mybatis">使用MyBatis访问数据库</h1> |
| <p>访问数据库可以使用第三方提供的组件。这里选择了MyBatis说明如何访问数据库。开发者也可以直接参考:</p> |
| <p><a href="http://www.mybatis.org/spring/zh/index.html">http://www.mybatis.org/spring/zh/index.html</a></p> |
| <p>这里给出一个快速集成参考。在本章中涉及到建表等数据库操作的时候,数据库选用MySQL。</p> |
| <h1 id="_1">设计表</h1> |
| <p>本应用提供了非常简单的用户管理和基于角色的鉴权机制。因此我们设计了非常简单的用户表,表格包含了用户名称及用户所属的角色。为了测试的目的,还插入了两个用户数据,其中密码采用SHA256进行单向加密保存。</p> |
| <pre><code>CREATE DATABASE IF NOT EXISTS porter_user_db; |
| |
| USE porter_user_db; |
| |
| DROP TABLE IF EXISTS T_USER; |
| |
| CREATE TABLE `T_USER` ( |
| `ID` INTEGER(20) NOT NULL COMMENT '用户ID', |
| `USER_NAME` VARCHAR(64) NOT NULL COMMENT '用户名称', |
| `PASSWORD` VARCHAR(64) NOT NULL COMMENT '用户密码', |
| `ROLE_NAME` VARCHAR(64) NOT NULL COMMENT '角色名称', |
| PRIMARY KEY (`ID`) |
| ); |
| |
| insert into T_USER(ID, USER_NAME, PASSWORD, ROLE_NAME) values(1, "admin", "n4bQgYhMfWWaL+qgxVrQFaO/TxsrC4Is0V1sFbDwCgg=", "admin"); |
| insert into T_USER(ID, USER_NAME, PASSWORD, ROLE_NAME) values(2, "guest", "n4bQgYhMfWWaL+qgxVrQFaO/TxsrC4Is0V1sFbDwCgg=", "guest"); |
| </code></pre> |
| <h1 id="mybatis_1">使用MyBatis</h1> |
| <ul> |
| <li>引用MyBatis的相关依赖</li> |
| </ul> |
| <p>依赖包含了MyBatis和Spring、DBCP2数据库连接池管理相关组件。这些组件都是使用Spring和MyBatis必须的。</p> |
| <pre><code><dependency> |
| <groupId>org.mybatis.spring.boot</groupId> |
| <artifactId>mybatis-spring-boot-starter</artifactId> |
| <exclusions> |
| <exclusion> |
| <groupId>org.springframework.boot</groupId> |
| <artifactId>spring-boot-starter-logging</artifactId> |
| </exclusion> |
| </exclusions> |
| </dependency> |
| <dependency> |
| <groupId>mysql</groupId> |
| <artifactId>mysql-connector-java</artifactId> |
| </dependency> |
| <dependency> |
| <groupId>org.apache.commons</groupId> |
| <artifactId>commons-dbcp2</artifactId> |
| </dependency> |
| <dependency> |
| <groupId>org.springframework</groupId> |
| <artifactId>spring-jdbc</artifactId> |
| <scope>compile</scope> |
| </dependency> |
| <dependency> |
| <groupId>org.springframework</groupId> |
| <artifactId>spring-aop</artifactId> |
| </dependency> |
| <dependency> |
| <groupId>org.springframework</groupId> |
| <artifactId>spring-context-support</artifactId> |
| </dependency> |
| <dependency> |
| <groupId>org.springframework</groupId> |
| <artifactId>spring-tx</artifactId> |
| </dependency> |
| </code></pre> |
| <ul> |
| <li>配置数据源和SqlSessionFactory</li> |
| </ul> |
| <p>本例子使用Spring Data Source, 只需要在配置文件中加上配置信息:</p> |
| <pre><code>spring: |
| datasource: |
| url: jdbc:mysql://localhost/porter_user_db |
| username: root |
| password: root |
| driver-class-name: com.mysql.jdbc.Driver |
| </code></pre> |
| <ul> |
| <li>书写Mapper文件</li> |
| </ul> |
| <p>涉及到JAVA的Mapper定义UserMapper。</p> |
| <pre><code>@Mapper |
| public interface UserMapper { |
| @Insert(""" |
| insert into T_USER (ID, USER_NAME, PASSWORD, ROLE_NAME) |
| values(#{id,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, |
| #{password,jdbcType=VARCHAR}, #{roleName,jdbcType=VARCHAR})""") |
| void createUser(UserInfo userInfo); |
| |
| @Select(""" |
| select ID, USER_NAME, PASSWORD, ROLE_NAME |
| from T_USER where USER_NAME = #{userName,jdbcType=VARCHAR}""") |
| @Results({ |
| @Result(property = "id", column = "ID"), |
| @Result(property = "userName", column = "USER_NAME"), |
| @Result(property = "password", column = "PASSWORD"), |
| @Result(property = "roleName", column = "ROLE_NAME") |
| }) |
| UserInfo getUserInfo(String userName); |
| } |
| |
| </code></pre> |
| <h2 id="_2">设计用户服务</h2> |
| <p>经过上面的配置,数据库访问相关开发已经完成了。 结合User Story,可以先设计一个login的服务接口。 这个服务在UserServiceEndpoint里面进行定义。</p> |
| <pre><code>@PostMapping(path = "/login", produces = MediaType.APPLICATION_JSON_VALUE) |
| public SessionInfo login(@RequestParam(name = "userName") String userName, |
| @RequestParam(name = "password") String password) |
| </code></pre> |
| <p>接口会返回SessionInfo,这些必要的信息,会在后续的鉴权、认证操作中起到很大的方便。</p> |
| <p>经过以上的开发,就可以启动用户服务,配置数据库和插入相关数据,从界面访问这个接口。</p> |
| <pre><code>#### 访问login接口的HTTP请求和响应 |
| |
| #Request |
| POST http://localhost:9090/api/user-service/v1/user/login |
| |
| Content-Type: application/x-www-form-urlencoded |
| |
| userName=admin&password=test |
| |
| #Response |
| { |
| "id": 0, |
| "sessiondId": "1be646c0-50cb-4c0a-968d-2a512775f5e8", |
| "userName": "guest", |
| "roleName": "guest", |
| "creationTime": null, |
| "activeTime": null |
| } |
| </code></pre> |
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