ibatis

目录 一、SqlMapConfig.xml 二、IUserDao.xml 三、JAVA 代码 四、Log 输出 五、总结 二级缓存： 它指的是 Mybatis 中 SqlSessionFactory 对象的缓存。由同一个 SqlSessionFactory 对象创建的 SqlSession 共享其缓存 二级缓存的使用步骤 让 Mybatis 框架支持二级缓存(在SqlMapConfig.xml配置) 让当前的映射文件支持二级缓存(在IUserDao.xml中配置) 让当前的操作支持二级缓存(在select标签中配置) 一、SqlMapConfig.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="jdbcConfig.properties"/> <settings> <!--默认为 true--> <setting name="cacheEnabled" value="true"/> </settings> <typeAliases>

我们知道Hibernate有自己的缓存机制，Hibernate中分为一级缓存和二级缓存，其中的一级缓存是session缓存，是Hibernate封装好的，不需要我们做任何配置的，一级缓存是与session绑定的，当session生命周期结束的时候对应的一级缓存也就消失了。Hibernate的二级缓存需要自己配置的，很遗憾，一直没去深入了解过，等过了这阶段比较忙的时间一定得好好研究研究Hibernate 至于我们的Ibatis，也是有着自己的缓存机制的，使用ibatis的缓存的时候我们要特别的小心谨慎，保证对缓存对象操作的同步性。 <!-- 定义缓存 --> <cacheModelid="query_cache_xy" readOnly="false" serialize="true" type="LRU"> <flushInterval hours="24" /> <flushOnExecute statement="xueyuan.save" /> <flushOnExecute statement="xueyuan.edit" /> <flushOnExecute statement="xueyuan.del" /> <property value="600" name="size" /> </cacheModel> 这是一个典型的缓存例子

Is there any way where I can get the executed query of iBatis? I want to reuse the query for an UNION query. For example: <sqlMap namespace="userSQLMap"> <select id="getUser" resultClass="UserPackage.User"> SELECT username, password FROM table WHERE id=#value# </select> </sqlMap> And when I execute the query through int id = 1 List<User> userList = queryDAO.executeForObjectList("userSQLMap.getUser",id) I want to get SELECT username, password FROM table WHERE id=1 Is there any way I could get the query? Thanks. Nando It's posible to show this information.iBatis uses some the Logging framework

I am confused about using $ vs # . I didn't found any guides for this. I used them as name = #{name} , name like '%${word}%' , order by name ${orderAs} , where name = #{word} Sometimes , these are work fine but at the sometimes , parameters aren't included or gave me error like org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'name'....... So, I'd like to know when to use $ or # ? Following the myBatis guidelines #{} is used in your sql statements. If you take a look any of MyBatis Reference in the Section Mapper XML Files it says explicity: Notice the

For our new product re-engineering, we are in the process of selecting the best framework from Java. As the consideration is to go for database agnostic approach for model, we are working on options between Struts + Spring with iBATIS or Hibernate. Please advice which is best as both offer persistence. Ibatis and Hibernate are quite different beasts. The way I tend to look at it is this: Hibernate works better if your view is more object-centric . If however you view is more database-centric then Ibatis is a much stronger choice. If you're in complete control of your schema and you don't have

I am newbie to mybatis. I am trying to get the id of last inserted record. My database is mysql and my mapper xml is <insert id="insertSelective" parameterType="com.mycom.myproject.db.mybatis.model.FileAttachment" > <selectKey resultType="java.lang.Long" keyProperty="id" order="AFTER" > SELECT LAST_INSERT_ID() as id </selectKey> insert into fileAttachment <trim prefix="(" suffix=")" suffixOverrides="," > <if test="name != null" > name, </if> <if test="attachmentFileSize != null" > size, </if> </trim> <trim prefix="values (" suffix=")" suffixOverrides="," > <if test="name != null" > #{name

1、异常：Field bookMapper in com.aaa.lee.springboot.service.BookService required a bean of type 'com.aaa.lee.springboot.mapper.BookMapper' that could not be found. 原因：在service中使用@Autowired注解注入了mapper，最终mapper没有注入成功，也就是mapper并没有以bean的形式配置进application.xml配置文件(没有mapper的扫描器) 需要添加@Mapper注解； 2、使用注解的形式写上SQL语句，实体类的属性和数据库的字段映射问题： 　　当使用@Select @Update @Delete @Insert来替代mapper.xml的时候，需要把数据库表中字段名和实体类的属性要完全一致！ 1 package com.aaa.liu.springboot.mapper; 2 3 import com.aaa.liu.springboot.model.Book; 4 import org.apache.ibatis.annotations.Delete; 5 import org.apache.ibatis.annotations.Insert; 6 import org.apache