package com.cyb.ms.mapper;

import org.apache.ibatis.annotations.Param;

public interface AccountMapper {

    void update(@Param("name") String name, @Param("money") int money);

    int queryMoney(String name);

}

<?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="com.cyb.ms.mapper.AccountMapper">

    <!-- 查询 -->

    <select id="queryMoney" parameterType="string" resultType="int">

        select money from s_account where name = #{name}

    </select>

    <!-- 修改 -->

    <update id="update" parameterType="map">

        UPDATE S_ACCOUNT SET money=#{money} WHERE name = #{name}

    </update>

</mapper>

org.apache.ibatis.binding.BindingException: Mapper method 'com.cyb.ms.mapper.AccountMapper.queryMoney attempted to return null from a method with a primitive return type (int).

    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:102)

    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:93)

    at com.sun.proxy.$Proxy21.queryMoney(Unknown Source)

    at com.cyb.ms.service.AccountServiceImpl.transfer(AccountServiceImpl.java:15)

    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.base/java.lang.reflect.Method.invoke(Method.java:567)

    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344)

    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)

    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:366)

    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:99)

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)

    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)

    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)

    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)

    at com.sun.proxy.$Proxy25.transfer(Unknown Source)

    at com.cyb.ms.service.AccountServiceTest.testTransfer(AccountServiceTest.java:18)

    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.base/java.lang.reflect.Method.invoke(Method.java:567)

    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)

    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)

    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

    at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)

    at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)

    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)

    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)

    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)

    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)

    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)

    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)

    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)

    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)

    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)

    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)

    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)

    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)

    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)

    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)

    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)

    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:89)

    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)

    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)