通过sql拼接表的下划线转驼峰

SELECT
    -- COLUMN_NAME,
    -- _分割之后的第一段
   concat(    SUBSTRING_INDEX(LOWER(column_name), '_', 1),
    -- _分割之后的第二段
    SUBSTR(
      UPPER(column_name),
      LENGTH(
        SUBSTRING_INDEX(column_name, '_', 1)
      ) + 2,
      1
    ),
    SUBSTR(
      LOWER(column_name),
      LENGTH(
        SUBSTRING_INDEX(column_name, '_', 1)
      ) + 3,
      LENGTH(
        SUBSTRING_INDEX(column_name, '_', 2)
      ) - LENGTH(
        SUBSTRING_INDEX(column_name, '_', 1)
      ) - 2
    ), -- _分割之后的第三段
    SUBSTR(
      UPPER(column_name),
      LENGTH(
        SUBSTRING_INDEX(column_name, '_', 2)
      ) + 2,
      1
    ),
         SUBSTR(
      LOWER(column_name),
      LENGTH(
        SUBSTRING_INDEX(column_name, '_', 2)
      ) + 3,
      LENGTH(
        SUBSTRING_INDEX(column_name, '_', 3)
      ) - LENGTH(
        SUBSTRING_INDEX(column_name, '_', 2)
      ) - 2
    ),
    -- _分割之后的第四段
    SUBSTR(
      UPPER(column_name),
      LENGTH(
        SUBSTRING_INDEX(column_name, '_', 3)
      ) + 2,
      1
    ),
    SUBSTR(
      LOWER(column_name),
      LENGTH(
        SUBSTRING_INDEX(column_name, '_', 3)
      ) + 3,
      LENGTH(
        SUBSTRING_INDEX(column_name, '_', 4)
      ) - LENGTH(
        SUBSTRING_INDEX(column_name, '_', 3)
      ) - 2
    )),
    column_comment 
FROM
    INFORMATION_SCHEMA.COLUMNS 
WHERE
    table_name = 'scd_cost_charge_item';