MyBatis-Plus实现动态表名
MyBatis实现方法如下现在要用MyBatis-Plus 实现
<select id="getList" resultType="com.wys.entity.User">
SELECT *
FROM ${tableName}
</select>
MyBatis-Plus官网说明
MyBatis-Plus版本
1、添加MyBatis-Plus依赖
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.5.1</version>
</dependency>
MyBatis-Plus配置
2、添加MyBatis-Plus配置，利用拦截器获取到表名给替换
@Configuration
public class MybatisPlusConfig {
static List<String> tableList(){
List<String> tables = new ArrayList<>();
//伪表名 可以为任意字符串 建议设置复杂度 避免重复 tables.add("C55EA8171877E962E08DFF63AA3678841");
tables.add("TestUser");
return tables;
}
//拦截器，获取到表名给替换
@Bean
public MybatisPlusInterceptor dynamicTableNameInnerInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
DynamicTableNameInnerInterceptor dynamicTableNameInnerInterceptor = new DynamicTableNameInnerInterceptor();
dynamicTableNameInnerInterceptor.setTableNameHandler((sql, tableName) -> {
String newTable = null;
for (String table : tableList()) {
newTable = RequestDataHelper.getRequestData(table);
if (table.equals(tableName) && newTable!=null){
tableName = newTable;
break;
}
}
return tableName;
});
interceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor);
return interceptor;
}
}
如果上面的拦截器不生效可以使用下面这个https://www.jb51.net/article/280321.htm
@Configuration
@AutoConfigureAfter(PageHelperAutoConfiguration.class)
public class MybatisPlusConfig {
static List<String> tableList(){
List<String> tables = new ArrayList<>();
//表名
tables.add("C55EA8171877E962E08DFF63AA3678841");
return tables;
}
//拦截器，获取到表名给替换
// @Bean
// public MybatisPlusInterceptor dynamicTableNameInnerInterceptor() {
// MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
// DynamicTableNameInnerInterceptor dynamicTableNameInnerInterceptor = new DynamicTableNameInnerInterceptor();
// dynamicTableNameInnerInterceptor.setTableNameHandler((sql, tableName) -> {
// String newTable = null;
// for (String table : tableList()) {
// newTable = RequestDataHelper.getRequestData(table);
// if (table.equals(tableName) && newTable!=null){
// tableName = newTable;
// break;
// }
// }
// return tableName;
// });
// interceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor);
// return interceptor;
// }
@Autowired
private List<SqlSessionFactory> sqlSessionFactoryList;
@PostConstruct
public void addMyInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
DynamicTableNameInnerInterceptor dynamicTableNameInnerInterceptor = new DynamicTableNameInnerInterceptor();
dynamicTableNameInnerInterceptor.setTableNameHandler((sql, tableName) -> {
String newTable = null;
for (String table : tableList()) {
newTable = RequestDataHelper.getRequestData(table);
if (table.equals(tableName) && newTable!=null){
tableName = newTable;
break;
}
}
return tableName;
});
interceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor);
for (SqlSessionFactory sqlSessionFactory : sqlSessionFactoryList) {
sqlSessionFactory.getConfiguration().addInterceptor(interceptor);
}
}
}
请求参数传递辅助类
3、创建请求参数传递辅助类
public class RequestDataHelper {
private static final ThreadLocal<Map<String, Object>> REQUEST_DATA = new ThreadLocal<>();
public static void setRequestData(Map<String, Object> requestData) {
REQUEST_DATA.set(requestData);
}
public static <T> T getRequestData(String param) {
Map<String, Object> dataMap = getRequestData();
if (CollectionUtils.isNotEmpty(dataMap)) {
return (T) dataMap.get(param);
}
return null;
}
public static Map<String, Object> getRequestData() {
return REQUEST_DATA.get();
}
}
使用
4、在程序中使用，注意如果实际表名与实体类与不同，可先在实体类类注明表名@TableName(“TestUser”)
@GetMapping("/listUser")
public void listUser(){
RequestDataHelper.setRequestData(new HashMap<String, Object>() {{
put("kfafkasfaskfasjfkasf", "user_2018");
}});
Integer age=2018;
User user=new User();
List list = userMapper.getList(user);
// User user_2019 = userMapper.findById("user_2019", 2019);
System.out.println(list);
System.out.println("-------------");
// System.out.println(user_2019);
RequestDataHelper.setRequestData(new HashMap<String, Object>() {{
put("kfafkasfaskfasjfkasf", "user_2019");
}});
List lis2 = userMapper.getList(user);
System.out.println(lis2);
System.out.println("-------------");
}
结果：
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