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这篇文章给大家分享的是有关 mybatis 项目配置文件的示例分析的内容。丸趣 TV 小编觉得挺实用的,因此分享给大家做个参考,一起跟随丸趣 TV 小编过来看看吧。
mybatis 项目配置
首先这事一个简单的 mybatis 项目配置文件:
?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
environments default= development
environment id= development
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= org/mybatis/example/BlogMapper.xml /
/mappers
/configuration
environment
mybatis 支持多个环境,可以任意配置
比如:
environments default= development
environment id= development
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
environment id= test
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
就会有两个环境,environments 中的 defalut 标签选择哪一个,默认就是哪一个
transactionManager
mybatis 支持两种类型的事务管理器,jdbc 和 managed(托管)
jdbc:应用程序管理数据库连接的生命周期
managed:由应用服务器负责管理数据库连接的生命周期(一般商业服务器才有此功能,如 JBOSS WebLogic)
dataSource
type:用来配置数据源,类型有:UNPOOLED、POOLED、JNDI
UNPOOLED:没有连接池,每次数据库操作,mybatis 都会创建一个新的连接,用完后,关闭:适合小并发项目
POOLED:有连接池
JNDI:使用应用服务器配置 JNDI 数据源获取数据库连接
properties
配置属性
比如:
properties resource= org/mybatis/example/config.properties
property name= username value= dev_user /
property name= password value= F2Fa3!33TYyg /
/properties
dataSource type= POOLED
property name= driver value= ${driver} /
property name= url value= ${url} /
property name= username value= ${username} /
property name= password value= ${password} /
/dataSource
typeAliases
给类的完整限定名取别名,方便使用
比如:
typeAliases
typeAlias alias= Author type= domain.blog.Author /
typeAlias alias= Blog type= domain.blog.Blog /
typeAlias alias= Comment type= domain.blog.Comment /
typeAlias alias= Post type= domain.blog.Post /
typeAlias alias= Section type= domain.blog.Section /
typeAlias alias= Tag type= domain.blog.Tag /
/typeAliases
!-- 最常用 --
typeAliases
package name= domain.blog /
/typeAliases
mappers
引入映射文件
!-- Using classpath relative resources --
mappers
mapper resource= org/mybatis/builder/AuthorMapper.xml /
mapper resource= org/mybatis/builder/BlogMapper.xml /
mapper resource= org/mybatis/builder/PostMapper.xml /
/mappers
!-- Using url fully qualified paths --
mappers
mapper url= file:///var/mappers/AuthorMapper.xml /
mapper url= file:///var/mappers/BlogMapper.xml /
mapper url= file:///var/mappers/PostMapper.xml /
/mappers
!-- Using mapper interface classes --
mappers
mapper >settings
An example of the settings element fully configured is as follows:
settings
setting name= cacheEnabled value= true /
setting name= lazyLoadingEnabled value= true /
setting name= multipleResultSetsEnabled value= true /
setting name= useColumnLabel value= true /
setting name= useGeneratedKeys value= false /
setting name= autoMappingBehavior value= PARTIAL /
setting name= autoMappingUnknownColumnBehavior value= WARNING /
setting name= defaultExecutorType value= SIMPLE /
setting name= defaultStatementTimeout value= 25 /
setting name= defaultFetchSize value= 100 /
setting name= safeRowBoundsEnabled value= false /
setting name= mapUnderscoreToCamelCase value= false /
setting name= localCacheScope value= SESSION /
setting name= jdbcTypeForNull value= OTHER /
setting name= lazyLoadTriggerMethods value= equals,clone,hashCode,toString /
/settings
plugins
插件 比如:
分页插件
plugins
plugin interceptor= com.github.pagehelper.PageHelper
property name= dialect value= mysql /
property name= offsetAsPageNum value= true /
property name= rowBoundsWithCount value= true /
property name= pageSizeZero value= true /
/plugin
/plugins
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