sharding jdbc(sphere) 3.1.0 spring boot配置

　　sharding jdbc 2.x series Detailed see https://www.cnblogs.com/zhjh256/p/9221634.html.

　　Recently sharding jdbc xml arranged to switch from spring boot. First introduced depend on:

            <dependency>
                <groupId>io.shardingsphere</groupId>
                <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
                <version>3.1.0</version>
            </dependency>

　　Https://shardingsphere.apache.org/document/legacy/3.x/document/en/manual/sharding-jdbc/configuration/config-spring-boot/ arranged to follow substantially the same configuration and xml .

reference:

　　3.1.0 Series: https: //shardingsphere.apache.org/document/legacy/3.x/document/en/manual/sharding-jdbc/configuration/config-spring-boot/

　　4.0 Series: https: //shardingsphere.apache.org/document/current/cn/manual/sharding-jdbc/configuration/config-spring-boot/