Mybatis 返回值配置理解

2024-07-10 21:20| 来源: 网络整理| 查看: 265

目录前提1. 返回整形数值2. 返回值 BigDecimal 浮点数金额类型3. 返回指定实体类格式的 List 数组参考链接

前提

Mybatis报错： A query was run and no Result Maps were found for the Mapped Statement

mybatis中的所有查询标签，都必须返回resultType或者resultMap的值，否则就会报如上错误的，其实仔细看看因为报错原因的意思就好了

1. 返回整形数值

TestMapper.xml 演示：

SELECT COUNT(1) FROM test_table

Java 调用演示：

@Autowired private TestMapper testMapper; Integer mycount = testMapper.getReturnNum(); 2. 返回值 BigDecimal 浮点数金额类型

TestMapper.xml 演示：

SELECT IFNULL(SUM(mymoney), 0.00) FROM test_table

Java 调用演示：

@Autowired private TestMapper testMapper; Integer mycount = testMapper.getReturnAmount(); 3. 返回指定实体类格式的 List 数组

TestMapper.xml 演示：

SELECT * FROM test_table

Java 调用演示：

import com.test.entity.MyEntity; @Autowired private TestMapper testMapper; List myList = testMapper.getReturnList(); 参考链接

Mybatis报错： A query was run and no Result Maps were found for the Mapped Statement

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