MyBatis----延迟加载demo

一：创建数据库脚本drop table project_info;
drop table status;

create table status(
id number(10) primary key,
name varchar2(20) not null
);

create table project_info(
id number(10) primary key,
project_name varchar2(100) not null,
start_date date not null,
end_date date not null,
status_id number(10) references status(id)
);

drop sequence seq_status;
drop sequence seq_projectinfo;
create sequence seq_status;
create sequence seq_projectinfo;

insert into status(id,name)values(seq_status.nextval,‘已申报‘);
insert into status(id,name)values(seq_status.nextval,‘审核中‘);
insert into status(id,name)values(seq_status.nextval,‘已审核‘);

insert into project_info(id,project_name,start_date,end_date,status_id)values(seq_projectinfo.nextval,‘北京社会科学院2017年申报‘,to_date(‘2017=04-02‘,‘yyyy-MM-dd‘),to_date(‘2017=04-03‘,‘yyyy-MM-dd‘),1);
insert into project_info(id,project_name,start_date,end_date,status_id)values(seq_projectinfo.nextval,‘福建社会科学院2017年申报‘,to_date(‘2017=04-04‘,‘yyyy-MM-dd‘),to_date(‘2017=04-05‘,‘yyyy-MM-dd‘),1);
insert into project_info(id,project_name,start_date,end_date,status_id)values(seq_projectinfo.nextval,‘上海社会科学院2017年申报‘,to_date(‘2017=04-06‘,‘yyyy-MM-dd‘),to_date(‘2017=04-07‘,‘yyyy-MM-dd‘),1);

　　二：项目目录结构

三：在src下创建jdbc.properties

driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
username=system
password=orcl

四：在src下创建log4j.properties

log4j.rootLogger=DEBUG, Console  

#Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n  

log4j.logger.java.sql.ResultSet=INFO
log4j.logger.org.apache=INFO
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

五：在src下创建mybatis-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd" >
<configuration>
  <properties resource="jdbc.properties"/>
  <settings>
  <!--  开启延时加载开关 -->
    <setting name="lazyLoadingEnabled" value="true"/>
    <!-- 设置延时加载 -->
    <setting name="aggressiveLazyLoading" value="false"/>
  </settings>
  <typeAliases>
    <typeAlias type="com.pojo.ProjectInfo" alias="ProjectInfo"/>
    <typeAlias type="com.pojo.Status" alias="Status"/>
  </typeAliases>
  <environments default="developement">
     <environment id="developement">
       <transactionManager type="JDBC"/>
       <dataSource type="POOLED">
         <property name="driver" value="${driver}"/>
         <property name="url" value="${url}"/>
         <property name="username" value="${username}"/>
         <property name="password" value="${password}"/>
       </dataSource>
     </environment>
  </environments>
  <mappers>
     <mapper resource="com/mapper/ProjectInfoMapper.xml"/>
  </mappers>
</configuration>