时间:2021-07-01 10:21:17 帮助过:3人阅读
MutiDatasourcePaginationPlugin 类文件为扩展的mybatis-generator 插件,用来在生成代码文件的过程中,完成不同数据库支持下的分页逻辑代码部分;
此例中只需要关心生成的 MutiDatabaseMapper.xml:
<select id="selectByExample" resultMap="BaseResultMap"
parameterType="com.alexgaoyh.MutiModule.persist.mutiDatabase.MutiDatabaseExample">
<include refid="OracleDialectPrefix" />
select
<if test="distinct">
distinct
</if>
<include refid="Base_Column_List" />
from mutidatabase mutiDatabase
<if test="_parameter != null">
<include refid="Example_Where_Clause" />
</if>
<if test="orderByClause != null">
order by ${orderByClause}
</if>
<include refid="OracleDialectSuffix" />
<include refid="MysqlDialect" />
</select>
<sql id="OracleDialectPrefix">
<if test="page != null and _databaseId == ‘oracle‘">
select * from ( select row_.*, rownum rownum_ from (
</if>
</sql>
<sql id="OracleDialectSuffix">
<if test="page != null and _databaseId == ‘oracle‘">
<![CDATA[ ) row_ ) where rownum_ > #{page.begin} and rownum_ <= #{page.end} ]]>
</if>
</sql>
<sql id="MysqlDialect">
<if test="page != null and _databaseId == ‘mysql‘">
limit #{page.begin} , #{page.length}
</if>
</sql>
这样,通过 databaseIdProvider 的不同,就完成不同sql语句的引入操作;
部分链接:
http://stackoverflow.com/questions/29139092/mybatis-multi-datasource-configuration-issue
https://mybatis.github.io/spring/factorybean.html
mybatis-generator 插件扩展,生成支持多种数据库的分页功能
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