# 查找在那个表并生成 字段名 SQL
SELECT TABLE_SCHEMA, TABLE_NAME, concat(TABLE_SCHEMA, '.', TABLE_NAME) AS st,
  concat('SELECT ', group_concat(COLUMN_NAME ORDER BY ORDINAL_POSITION SEPARATOR ', ' ),
  ' FROM ' , concat(TABLE_SCHEMA, '.', TABLE_NAME) , ';') AS SQLstr
FROM information_schema.COLUMNS WHERE 1=1
AND TABLE_NAME like 'job_depend' GROUP BY TABLE_SCHEMA, TABLE_NAME ORDER BY length(TABLE_SCHEMA);

# 查找多个字段在哪个表 并生成 字段名 SQL
SELECT TABLE_SCHEMA, TABLE_NAME, concat(TABLE_SCHEMA, '.', TABLE_NAME) AS st,
  concat('SELECT ', group_concat(COLUMN_NAME ORDER BY ORDINAL_POSITION SEPARATOR ', ' ),
  ' FROM ' , concat(TABLE_SCHEMA, '.', TABLE_NAME) , ';') AS SQLstr
FROM information_schema.COLUMNS WHERE 1=1
AND TABLE_NAME in ('job_depend','job_id') GROUP BY TABLE_SCHEMA, TABLE_NAME
HAVING count(TABLE_NAME)>=2 ORDER BY length(TABLE_SCHEMA);

# #{驼峰字段} (创建存储函数snakeToCamel后使用)
SELECT TABLE_SCHEMA, TABLE_NAME,
  snakeToCamel(group_concat(concat('#{',COLUMN_NAME,'}')
  ORDER BY ORDINAL_POSITION SEPARATOR ', ')) AS COLUMN_NAMES
FROM information_schema.COLUMNS WHERE 1=1
AND TABLE_NAME like 'job_depend' GROUP BY TABLE_SCHEMA, TABLE_NAME;

# 字段名=#{驼峰字段} SQL (创建存储函数snakeToCamel后使用)
SELECT TABLE_SCHEMA, TABLE_NAME, concat('UPDATE ', TABLE_NAME, ' SET\n',
  group_concat(concat('  ', COLUMN_NAME,' = #{',snakeToCamel(COLUMN_NAME),'}')
  ORDER BY ORDINAL_POSITION SEPARATOR ',\n')
  , '\nWHERE col=val;')AS SQLStr
FROM information_schema.COLUMNS WHERE 1=1
AND TABLE_NAME like 'job_depend' GROUP BY TABLE_SCHEMA, TABLE_NAME;

# 打开 MySQL8 默认关闭的创建存储函数开关
SET GLOBAL log_bin_trust_function_creators = 1;
# 若存储过程存在则删除
DROP FUNCTION IF EXISTS snakeToCamel;
# 重定义分隔符，兼容 DataGrip 以外的程序
DELIMITER $
# 创建一个存储函数
CREATE FUNCTION snakeToCamel(snakeString VARCHAR(16383))
  # 返回值类型
  RETURNS VARCHAR(16383)
  # 开始内容
  BEGIN
    set snakeString = replace(snakeString, '_a', 'A');
    set snakeString = replace(snakeString, '_b', 'B');
    set snakeString = replace(snakeString, '_c', 'C');
    set snakeString = replace(snakeString, '_d', 'D');
    set snakeString = replace(snakeString, '_e', 'E');
    set snakeString = replace(snakeString, '_f', 'F');
    set snakeString = replace(snakeString, '_g', 'G');
    set snakeString = replace(snakeString, '_h', 'H');
    set snakeString = replace(snakeString, '_i', 'I');
    set snakeString = replace(snakeString, '_j', 'J');
    set snakeString = replace(snakeString, '_k', 'K');
    set snakeString = replace(snakeString, '_l', 'L');
    set snakeString = replace(snakeString, '_m', 'M');
    set snakeString = replace(snakeString, '_n', 'N');
    set snakeString = replace(snakeString, '_o', 'O');
    set snakeString = replace(snakeString, '_p', 'P');
    set snakeString = replace(snakeString, '_q', 'Q');
    set snakeString = replace(snakeString, '_r', 'R');
    set snakeString = replace(snakeString, '_s', 'S');
    set snakeString = replace(snakeString, '_t', 'T');
    set snakeString = replace(snakeString, '_u', 'U');
    set snakeString = replace(snakeString, '_v', 'V');
    set snakeString = replace(snakeString, '_w', 'W');
    set snakeString = replace(snakeString, '_x', 'X');
    set snakeString = replace(snakeString, '_y', 'Y');
    set snakeString = replace(snakeString, '_z', 'Z');
    set snakeString = replace(snakeString, '_', '');
    RETURN snakeString;
  END;
DELIMITER ;

# 字段注释
SELECT TABLE_SCHEMA, TABLE_NAME,
  group_concat(CASE COLUMN_COMMENT
               WHEN '' THEN COLUMN_NAME
               ELSE COLUMN_COMMENT END
  ORDER BY ORDINAL_POSITION SEPARATOR ', ' ) AS COLUMN_NAMES
FROM information_schema.COLUMNS WHERE 1=1
AND TABLE_NAME like 'job_depend' GROUP BY TABLE_SCHEMA, TABLE_NAME;

# 查找在那个表并生成 字段名 AS 注释 SQL
SELECT TABLE_SCHEMA, TABLE_NAME,
  concat('SELECT ',group_concat(
    CASE COLUMN_COMMENT
    WHEN '' THEN COLUMN_NAME
    ELSE concat_ws(' AS ', COLUMN_NAME, COLUMN_COMMENT)
    END
  ORDER BY ORDINAL_POSITION SEPARATOR ', ')
  , ' FROM ' , TABLE_SCHEMA, '.', TABLE_NAME, ';') AS SQLStr
FROM information_schema.COLUMNS WHERE 1=1
AND TABLE_NAME like 'job_depend' GROUP BY TABLE_SCHEMA, TABLE_NAME;

# /** 字段名 */\n private type 驼峰字段; (创建存储函数snakeToCamel后使用)
SELECT TABLE_SCHEMA, TABLE_NAME,
  group_concat(concat('    /** ', COLUMN_COMMENT, ' */\n'
                      ,'    private ',
                      CASE COLUMN_TYPE
                      WHEN 'VARCHAR' THEN 'String'
                      WHEN 'CHAR' THEN 'String'
                      WHEN 'TEXT' THEN 'String'

                      WHEN 'TINYINT' THEN 'Integer'
                      WHEN 'SMALLINT' THEN 'Integer'
                      WHEN 'MEDIUMINT' THEN 'Integer'
                      WHEN 'BOOLEAN' THEN 'Integer'
                      WHEN 'BIGINT' THEN 'BigInteger'

                      WHEN 'INTEGER' THEN 'Long'
                      WHEN 'ID' THEN 'Long'
                      WHEN 'FLOAT' THEN 'Float'
                      WHEN 'DOUBLE' THEN 'Double'
                      WHEN 'DECIMAL' THEN 'BigDecimal'
                      WHEN 'BIT' THEN 'Boolean'
                      WHEN 'BLOB' THEN 'byte[]'

                      WHEN 'DATE' THEN 'Date'
                      WHEN 'YEAR' THEN 'Date'
                      WHEN 'TIME' THEN 'Time'
                      WHEN 'DATETIME' THEN 'Timestamp'
                      WHEN 'TIMESTAMP' THEN 'Timestamp'
                      ELSE 'String ' END,
                      snakeToCamel(COLUMN_NAME),';'
                      ,'\n'
                      )
  ORDER BY ORDINAL_POSITION SEPARATOR '\n' ) AS Java
FROM information_schema.COLUMNS WHERE 1=1
AND TABLE_NAME like 'job_depend' GROUP BY TABLE_SCHEMA, TABLE_NAME;