mybatis项目配置
首先这事一个简单的mybatis项目配置文件：
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<? 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：
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< 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：
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< 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：
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< 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
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<!-- 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 class = "org.mybatis.builder.AuthorMapper" /> < mapper class = "org.mybatis.builder.BlogMapper" /> < mapper class = "org.mybatis.builder.PostMapper" /> </ mappers > <!-- Register all interfaces in a package as mappers --> < mappers > < package name = "org.mybatis.builder" /> </ mappers > |
settings
An example of the settings element fully configured is as follows:
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< 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
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< 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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