直接上干货：
例如一个叫xxx的项目，yml文件里加上这段
xxxproject:db:xxxTable: xxx_dbname #自定义的数据库表名
创一个Configuration类放表名和Mapper
// XxxProjectAutoConfiguration.java@Configuration
@MapperScan(basePackages = "cn.com.xxxproject.db.mapper")
public class XxxProjectAutoConfiguration {@Value("${xxxproject.db.xxxTable}")private String xxxTable;@Autowiredprivate XxxMapper xxxMapper;@Beanpublic DatabaseManager databaseManager() {return new DatabaseManager (xxxTable, xxxMapper);}
}
看到这聪明的你应该已经知道后续该怎么做了
// DatabaseManager.javapublic class DatabaseManager extends AbstractManager<XxxDO> {private static final String DEFAULT_LOCK_TABLE_NAME = "xxx_dbname";private final XxxMapper xxxMapper;private final String localIp;private final String xxxTable;public DatabaseLockManager(String xxxTable, XxxMapper xxxMapper) {this.xxxMapper = xxxMapper;this.localIp = getLocalIp();if (StringUtils.isNullOrEmpty(xxxTable)) {xxxTable = DEFAULT_LOCK_TABLE_NAME;}this.xxxTable = xxxTable;}// 随便写个方法，根据自己需求来定制@Overrideprotected boolean isExists(Long id) {return xxxMapper.isExists(xxxTable, id);}@Overrideprotected XxxDO selectForUpdate(String xxxKey) {return xxxMapper.selectForUpdate(xxxTable, xxxKey);}
}
<!-- LockMapper.xml --><?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.com.xxxproject.db.mapper.XxxMapper"></mapper>
// LockMapper.java@Mapper
public interface LockMapper {@Select("select * from ${xxxTable} where id = #{id}")@Results(id = "XxxMap",value = { @Result(property = "id", column = "id"), @Result(property = "xxxKey", column = "xxx_key"),@Result(property = "nodeInfo", column = "node_info"), @Result(property = "count", column = "count"),@Result(property = "version", column = "version"),@Result(property = "createTime", column = "create_time"),@Result(property = "updateTime", column = "update_time") })boolean isExists(String xxxTable, Long id);@Select("select * from ${xxxTable} where xxx_key= #{xxxKey} for update")@ResultMap("XxxMap")XxxDO selectForUpdate(String xxxTable, String xxxKey);
}
完事！
顺便放两个关于Mybatis的好文章：
mybatis注解在方法直接编写SQL@Select@Insert@Update@Delete
MyBatis框架核心之注解使用@ResultMap及多表查询
第一篇是偏入门操作，第二篇的4.3多表查询真的适合反复细品
本篇用到：结果集映射相关注解
1、通过@Results、@Result注解定义结果集映射
如果实体字段的名称与数据库表字段名称不一致时，我们就需要显式的指定映射关系。这是通过@Results、@Result注解来指定的，例如为UserMapper的selectById指定映射关系：
@Select("SELECT id,name FROM user where id= #{id}")
@Results(id = "userMap", value = {@Result(property = "id", column = "id", javaType = Integer.class,jdbcType = JdbcType.INTEGER,id = true),@Result(property = "name", column = "name",javaType = String.class,jdbcType = JdbcType.VARCHAR)})
public User selectById(int id);
其中：
@Results注解：id属性用于给这个映射关系起一个名字(这里指定的为userMap)，其内部还包含了一个@Result[]来表示实体属性和数据库表字段的映射关系
@Result注解：property属性是java实体属性的名称，column表示对应的数据库字段的名称。javaType和JdbcType属性可以不指定。
2、通过@ResultMap复用结果集映射
上述方法electById方法已经通过@Results注解指定了结果映射关系，可以通过@ResultMap来引用@Results的id属性值进行复用。如在UserMapper的selectAll方法进行复用：
@Select("SELECT id,name FROM user")
@ResultMap("userMap")
public List<User> selectAll();
THX~
