在MySQL中执行脚本根据MySQL表生成hive建表语句

在MySQL中生成hive建表语句

1、保持与MySQL表结构一致；

2、在最后增加数据同步时间字段。

SELECT
    CONCAT('create table ',@tbl_name,'(')
UNION ALL
SELECT
    CONCAT(
        COLUMN_NAME,
        ' ',
        CASE
    WHEN DATA_TYPE in ('varchar','longtext','char','datetime','timestamp','varbinary','bit','mediumtext','set','longblob','text','blob','time','date') THEN
        'string'
    WHEN DATA_TYPE = 'decimal' THEN
        COLUMN_TYPE
   WHEN DATA_TYPE = 'float' THEN
        'double'
    ELSE 
        DATA_TYPE
    END -- 数据类型转换
    ,
    ' comment ',
    '\'',
    CASE
    WHEN COLUMN_COMMENT is NULL THEN
        COLUMN_NAME
    ELSE
        replace(COLUMN_COMMENT,';',',')
    END,
    '\','
    )
FROM
    information_schema. COLUMNS t1
WHERE
     t1.table_schema = @tbl_schema
 and t1.TABLE_NAME = @tbl_name
UNION ALL
SELECT
    concat(
        'etl_update string COMMENT \'数据同步时间\') ',
        'COMMENT \'',
        COALESCE (t2.TABLE_COMMENT ,@tbl_name),
        '\'
-- PARTITIONED BY (DATE STRING COMMENT \'日期分区\') -- 分区表取消注释
ROW FORMAT DELIMITED FIELDS TERMINATED BY \',\' STORED AS TEXTFILE;'
        )
    FROM
        information_schema. TABLES t2
    WHERE
        t2.table_schema = (@tbl_schema := 'XXX')
    and t2.table_name = (@tbl_name := 'XXX')