mysql查询列定义，是否自增等

SELECT
    ORDINAL_POSITION AS Colorder,
    Column_Name AS ColumnName,
    data_type AS TypeName,
    COLUMN_COMMENT AS DeText,
    (
        CASE
        WHEN data_type = ‘float‘
        OR data_type = ‘double‘
        OR data_type = ‘decimal‘ THEN
            NUMERIC_PRECISION
        ELSE
            CHARACTER_MAXIMUM_LENGTH
        END
    ) AS length,
    NUMERIC_SCALE AS Scale,
    (
        CASE
        WHEN EXTRA = ‘auto_increment‘ THEN
            1
        ELSE
            0
        END
    ) AS IsIdentity,
    (
        CASE
        WHEN COLUMN_KEY = ‘PRI‘ THEN
            1
        ELSE
            0
        END
    ) AS IsPK,
    (
        CASE
        WHEN IS_NULLABLE = ‘NO‘ THEN
            0
        ELSE
            1
        END
    ) AS CanNull,
    extra,
    COLUMN_DEFAULT AS DefaultVal
FROM
    information_schema. COLUMNS