mybatis項(xiàng)目配置
首先這事一個(gè)簡單的mybatis項(xiàng)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支持多個(gè)環(huán)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>
就會有兩個(gè)環(huán)境，environments中的defalut標(biāo)簽選擇哪一個(gè)，默認(rèn)就是哪一個(gè)
transactionManager
mybatis支持兩種類型的事務(wù)管理器，jdbc和managed（托管）
jdbc：應(yīng)用程序管理數(shù)據(jù)庫連接的生命周期
managed：由應(yīng)用服務(wù)器負(fù)責(zé)管理數(shù)據(jù)庫連接的生命周期（一般商業(yè)服務(wù)器才有此功能，如JBOSS WebLogic）
dataSource
type：用來配置數(shù)據(jù)源，類型有：UNPOOLED、POOLED、JNDI
UNPOOLED：沒有連接池，每次數(shù)據(jù)庫操作，mybatis都會創(chuàng)建一個(gè)新的連接，用完后，關(guān)閉：適合小并發(fā)項(xiàng)目
POOLED：有連接池
JNDI：使用應(yīng)用服務(wù)器配置JNDI數(shù)據(jù)源獲取數(shù)據(jù)庫連接
properties
配置屬性
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
給類的完整限定名取別名，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 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:
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：
分頁插件
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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