【YashanDB数据库】Mybatis-plus分页框架识别不到Yashandb

问题描述
Mybatis-plus 无法识别Yashandb数据库，应用有如下报错。

问题分析
从Mybatis-plus源码里面看到，getDBtype函数是没有Yashandb的方言。

当Yashandb使用mybatis-plus分页时候，会抛出异常即other database not supported。

package com.baomidou.mybatisplus.extension.toolkit;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.core.toolkit.Assert;
import com.baomidou.mybatisplus.core.toolkit.ExceptionUtils;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Pattern;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;

public class JdbcUtils {
private static final Log logger = LogFactory.getLog(JdbcUtils.class);
private static final Map JDBC_DB_TYPE_CACHE = new ConcurrentHashMap();

public JdbcUtils() {
}

public static DbType getDbType(Executor executor) {
    try {
        Connection conn = executor.getTransaction().getConnection();
        return (DbType)JDBC_DB_TYPE_CACHE.computeIfAbsent(conn.getMetaData().getURL(), JdbcUtils::getDbType);
    } catch (SQLException var2) {
        throw ExceptionUtils.mpe(var2);
    }
}

public static DbType getDbType(String jdbcUrl) {
    Assert.isFalse(StringUtils.isBlank(jdbcUrl), "Error: The jdbcUrl is Null, Cannot read database type", new Object[0]);
    String url = jdbcUrl.toLowerCase();
    if (!url.contains(":mysql:") && !url.contains(":cobar:")) {
        if (url.contains(":mariadb:")) {
            return DbType.MARIADB;
        } else if (url.contains(":oracle:")) {
            return DbType.ORACLE;
        } else if (!url.contains(":sqlserver:") && !url.contains(":microsoft:")) {
            if (url.contains(":sqlserver2012:")) {
                return DbType.SQL_SERVER;
            } else if (url.contains(":postgresql:")) {
                return DbType.POSTGRE_SQL;
            } else if (url.contains(":hsqldb:")) {
                return DbType.HSQL;
            } else if (url.contains(":db2:")) {
                return DbType.DB2;
            } else if (url.contains(":sqlite:")) {
                return DbType.SQLITE;
            } else if (url.contains(":h2:")) {
                return DbType.H2;
            } else if (regexFind(":dm\\d*:", url)) {
                return DbType.DM;
            } else if (url.contains(":xugu:")) {
                return DbType.XU_GU;
            } else if (regexFind(":kingbase\\d*:", url)) {
                return DbType.KINGBASE_ES;
            } else if (url.contains(":phoenix:")) {
                return DbType.PHOENIX;
            } else if (url.contains(":zenith:")) {
                return DbType.GAUSS;
            } else if (url.contains(":gbase:")) {
                return DbType.GBASE;
            } else if (!url.contains(":gbasedbt-sqli:") && !url.contains(":informix-sqli:")) {
                if (url.contains(":clickhouse:")) {
                    return DbType.CLICK_HOUSE;
                } else if (url.contains(":oscar:")) {
                    return DbType.OSCAR;
                } else if (url.contains(":sybase:")) {
                    return DbType.SYBASE;
                } else if (url.contains(":oceanbase:")) {
                    return DbType.OCEAN_BASE;
                } else if (url.contains(":highgo:")) {
                    return DbType.HIGH_GO;
                } else if (url.contains(":cubrid:")) {
                    return DbType.CUBRID;
                } else if (url.contains(":goldilocks:")) {
                    return DbType.GOLDILOCKS;
                } else if (url.contains(":csiidb:")) {
                    return DbType.CSIIDB;
                } else if (url.contains(":sap:")) {
                    return DbType.SAP_HANA;
                } else if (url.contains(":impala:")) {
                    return DbType.IMPALA;
                } else if (url.contains(":vertica:")) {
                    return DbType.VERTICA;
                } else if (url.contains(":xcloud:")) {
                    return DbType.XCloud;
                } else if (url.contains(":firebirdsql:")) {
                    return DbType.FIREBIRD;
                } else {
                    logger.warn("The jdbcUrl is " + jdbcUrl + ", Mybatis Plus Cannot Read Database type or The Database's Not Supported!");
                    return DbType.OTHER;
                }
            } else {
                return DbType.GBASE_8S;
            }
        } else {
            return DbType.SQL_SERVER2005;
        }
    } else {
        return DbType.MYSQL;
    }
}

public static boolean regexFind(String regex, CharSequence input) {
    return null == input ? false : Pattern.compile(regex).matcher(input).find();
}

}
解决办法
办法1:

添加java配置类，业务系统指定ORM框架需要使用Oracle(MySQL)方言

package com.sics.config;
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MybatisPlusConfig {
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor() {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.ORACLE));
return interceptor;
}