mybatis 整合springMvc 二

mybatis 整合dao 层代码；

需要配置 mybatis-config.xml 用于使用spring 实例化一个sqlsessionFactoryBean 工厂类。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
		xmlns:context="http://www.springframework.org/schema/context"
		xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
		xsi:schemaLocation="http://www.springframework.org/schema/beans
    	 http://www.springframework.org/schema/beans/spring-beans.xsd
     	 http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/aop
         http://www.springframework.org/schema/aop/spring-aop.xsd
         http://www.springframework.org/schema/tx
     	 http://www.springframework.org/schema/tx/spring-tx.xsd">
     	 <!-- 使用properties 文件 -->
   <context:property-placeholder location="classpath:db/db.properties"/>
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="driverClass" value="${mysql.jdbc.driver}"></property>
		<property name="jdbcUrl" value="${mysql.jdbc.url}"></property>
		<property name="user" value="${mysql.jdbc.userName}"></property>
		<property name="password" value="${mysql.jdbc.passWord}"></property>
		<!-- 当连接池中连接耗尽时，一次获取值 -->
		<property name="acquireIncrement" value="${mysql.jdbc.acquireIncrement}"></property>
		<property name="initialPoolSize" value="${mysql.jdbc.initialSize}"></property>
		<property name="minPoolSize" value="${mysql.minPoolSize}"></property>
		<property name="maxPoolSize" value="${mysql.maxPoolSize}"></property>
      </bean>
   <!-- 使用会话配置 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
     	<property name="dataSource" ref="dataSource"></property>
     	<property name="mapperLocations" value="classpath:mappings/*.xml"></property> 
    </bean>
 <!-- 扫描mapper 接口 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
         <property name="basePackage" value="com.fandong.it.weapon.mapper"></property>
         <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
    </bean> 	
      <!-- 配置事物 -->
   <bean  id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
     <property name="dataSource" ref="dataSource"></property>
   </bean>
   <!-- 使用注解事务 -->
   <tx:annotation-driven transaction-manager="dataSourceTransactionManager"></tx:annotation-driven>
   
</beans>

mappings 文件下是使用xml 进行sql 实例化对象

<?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.fandong.it.weapon.mapper.UserMapper">
   <select id="getUser" parameterType="int" resultType="com.fandong.it.weapon.entity.User" >
       select * from user where age=#{age}
   </select>
</mapper>

db文件中是 mysql数据的配置



mysql.jdbc.url=jdbc:mysql://hadoop03.fandong.com:3306/springStudy
mysql.jdbc.driver=com.mysql.jdbc.Driver
mysql.jdbc.userName=nodejs1
mysql.jdbc.passWord=nodejs1
mysql.jdbc.acquireIncrement=5  
mysql.jdbc.initialSize=0  
mysql.jdbc.maxActive=20    
mysql.minPoolSize=5
mysql.maxPoolSize=20

--是一个实体类

/**
 * 
 */
package com.fandong.it.weapon.entity;

/**
 * @author fandong
 *
 */
public class User {
   public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	private String name;
	   private Integer age;
   
   
}

--mapper 接口方法

/**
 * 
 */
package com.fandong.it.weapon.mapper;

import com.fandong.it.weapon.entity.User;

/**
 * @author fandong
 *
 */
public interface UserMapper {
   User getUser(int id);
}

在impl module 中引用

这样其实就是使用jdbcTemplate 添加了一个dao层，进行控制数据，把这里面的sql 进行抽离出去。

在Controller 中调用service 方法

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启动发现报错，无法tx 注解

at java.lang.Thread.run(Thread.java:748)

Caused by: org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/tx]

Offending resource: class path resource [mybatis-config.xml]

解决方案：这个是tx 事务的无法解析引入 spring-jdbc 即可。

2 、

一月 10, 2020 6:19:05 下午 org.springframework.web.servlet.FrameworkServlet initServletBean

严重: Context initialization failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [mybatis-config.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'datasource' of bean class [org.mybatis.spring.SqlSessionFactoryBean]: Bean property 'datasource' is not writable or has an invalid setter method. Did you mean 'dataSource'?

解决方案：<property name="dataSource" ref="dataSource"></property> name 的 datasource 小写了，改成大写即可。

3、

严重: Servlet.service() for servlet [springmvc] in context with path [/mybatisWeb] threw exception [Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.fandong.it.weapon.mapper.UserMapper.getUser]

分析 mapper

一定要指定到类

<mapper namespace="com.fandong.it.weapon.mapper.UserMapper">

4、启动OK，数据库中

browser中

至此项目搭建完成。

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