Mybatis從入門到精通下篇
阿新 • • 發佈:2019-01-01
Mybatis從入門到精通下篇:
輸入型別:
輸出型別:
ResultMap:
動態sql:
if標籤:
where標籤:
sql片段:
foreach標籤:
關聯查詢:
以訂單作為主體:
一對一查詢:
新建pojo:
以user為主體:
一對多關聯:
Mybatis整合Spring:
配置檔案:SqlMapConfig.xml:
載入對映檔案(其他都不用):
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ApplicationContext:(很關鍵)
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd"> <!-- 載入配置檔案 --> <context:property-placeholder location="classpath:Config/db.properties" /> <!-- 資料庫連線池 --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="${jdbc.driver}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <!-- 連線池的最大資料庫連線數 --> <property name="maxActive" value="10" /> <!-- 最大空閒數 --> <property name="maxIdle" value="5" /> </bean> <!-- SqlSessionFactory配置 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- 載入mybatis核心配置檔案 --> <property name="configLocation" value="classpath:Config/SqlMapConfig.xml" /> <!-- 別名包掃描 --> <property name="typeAliasesPackage" value="pojo"/> </bean> <!-- 傳統Dao配置,載入實現類 --> <bean class="dao.impl.UserDaoImpl"> <property name="sqlSessionFactory" ref="sqlSessionFactory" /> </bean> </beans>
Dao開發: