Sources Configuration Real data sources list. Tables Configuration Configurations of logic table names, data node and table sharding rules. Data Node Configuration It is used in the configurations of it requires to rewrite logic table names in sharding settings into actual table names acquired after routing. Database sharding does not require to rewrite table names. In addition to that, there are also dimension, and its names in different tables can repeat. In some other databases (such as PostgreSQL/Oracle), however, the index is created according to the database dimension, index names in different tables

version} to the actual version. 3. Edit application.yml. spring: shardingsphere: datasource: names: ds_0, ds_1 ds_0: type: com.zaxxer.hikari.HikariDataSource driverClassName: com.mysql.cj.jdbc.Driver tables according to the primary key endings, are t_order_0 to t_order_9, and their logical table names are t_order. Actual Table Physical tables that exist in the horizontally sharded databases. Those WHEN The following CASE WHEN statements are not supported: ‐ CASE WHEN contains sub‐query ‐ Logic names are used in CASE WHEN( Please use an alias) Pagination Query Due to the complexity of paging queries

version} to the actual version. 3. Edit application.yml. spring: shardingsphere: datasource: names: ds_0, ds_1 ds_0: type: com.zaxxer.hikari.HikariDataSource driverClassName: com.mysql.cj.jdbc.Driver tables according to the primary key endings, are t_order_0 to t_order_9, and their logical table names are t_order. Actual Table Physical tables that exist in the horizontally sharded databases. Those WHEN The following CASE WHEN statements are not supported: ‐ CASE WHEN contains sub‐query ‐ Logic names are used in CASE WHEN( Please use an alias) Pagination Query Due to the complexity of paging queries

-javaagent:\absolute path\shardingsphere-agent.jar Agent Configuration It is found under the local package directory and unzip directory : agent.yaml applicationName: shardingsphere-agent # application name according to business scenarios. # Configure actual data sources spring.shardingsphere.datasource.names=ds0,ds1 # Configure the first data source 5.1. ShardingSphere-JDBC 73 Apache ShardingSphere document configuration of datasource. For example: # Configure actual data sources spring.shardingsphere.datasource.names=ds0,ds1 # Configure the first data source spring.shardingsphere.datasource.ds0.jndi-name=java:comp/env/jdbc/ds0

Reading table information for completion of table and column names │Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Agent configuration • Directory structure Create agent directory, and unzip agent distribution package to the directory. ˋˋˋshell mkdir agent tar ‐zxvf apache‐shardingsphere‐latest.release.version − Table String Name of sharding logic table • actua lData Nodes (?) String Describe data source names and actual tables, delimiter as point. Multiple data nodes split by comma, support inline expres‐

version} to the actual version. 3. Edit application.yml. spring: shardingsphere: datasource: names: ds_0, ds_1 ds_0: type: com.zaxxer.hikari.HikariDataSource driverClassName: com.mysql.cj.jdbc.Driver Reading table information for completion of table and column names │Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Agent configuration • Directory structure Create agent directory, and unzip agent distribution package to the directory. ˋˋˋshell mkdir agent tar ‐zxvf apache‐shardingsphere‐latest.release.version −

tables according to the primary key endings, are t_order_0 to t_order_9, and their logical table names are t_order. Actual Table Physical tables that exist in the horizontally sharded databases. Those WHEN The following CASE WHEN statements are not supported: ‐ CASE WHEN contains sub‐query ‐ Logic names are used in CASE WHEN( Please use an alias) Pagination Query Due to the complexity of paging queries of distributed key generators Unsupported SQL: • CASE WHEN contains sub‐query • Logical table names are used in CASE WHEN( Please use an alias) • INSERT INTO tbl_name (col1, col2, ⋯) SELECT * FROM

tables according to the primary key endings, are t_order_0 to t_order_9, and their logical table names are t_order. Actual Table Physical tables that exist in the horizontally sharded databases. Those WHEN The following CASE WHEN statements are not supported: ‐ CASE WHEN contains sub‐query ‐ Logic names are used in CASE WHEN( Please use an alias) Pagination Query Due to the complexity of paging queries of distributed key generators Unsupported SQL: • CASE WHEN contains sub‐query • Logical table names are used in CASE WHEN( Please use an alias) • INSERT INTO tbl_name (col1, col2, ⋯) SELECT * FROM

alias="emp"/> 2) 类很多的情况下，可以批量设置别名这个包下的每一个类创建一个默认的别名，就是简 单类名小写 <package name="com.atguigu.mybatis.beans"/> JAVAEE 课程系列 ————————————————————————————— 11 更多 Java –大数据 –前端 Java –大数据 –前端 –python 人工智能资料下载，可访问百度：尚硅谷官网 3) 使用批量注册，这种方式要求 SQL 映射文件名必须和接口名相同并且在同一目录下 <package name="com.atguigu.mybatis.dao"/> 第 4 章 MyBatis 映射文件 4.1 Mybatis 映射文件简介 1) MyBatis <package name="com.atguigu.mybatis.dao"/> JAVAEE 课程系列 ————————————————————————————— 16 更多 Java

这样的映射器类（Mapper class）来说，还有另一招来处理。它们的映射的语句可以不需要用 XML 来做，取而 代之的是可以使用 Java 注解。比如，上面的 XML 示例可被替换如下： package org.mybatis.example; public interface BlogMapper { @Select("SELECT * FROM blog WHERE id = #{id}") manually or automatically with PDFmyURL 也可以指定一个包名，MyBatis 会在包名下面搜索需要的 Java Bean，比如: <package name="domain.blog"/> 每一个在包 domain.blog 中的 Java Bean，在没有注解的情况下，会使用 Bean 的首字母小写的非限定类名来作为它的别名。 属性中也同时指定，则注解方式将被忽略。 最后，可以让 MyBatis 为你查找类型处理器： <package name="org.mybatis.example"/> 注意在使用自动检索（autodiscovery）功能的时候，只能通过注解方式来指定 JDBC 的类型。