获取mysql库中所有的表字段

SELECT
COLUMN_NAME
columnName,
COLUMN_TYPE columnType,
DATA_TYPE dataType,
CHARACTER_MAXIMUM_LENGTH characterMaximumLength,
IS_NULLABLE isNullable,
COLUMN_DEFAULT columnDefault,
COLUMN_COMMENT columnComment,
TABLE_NAME tableName
FROM
INFORMATION_SCHEMA.COLUMNS
WHERE
table_schema =
#{dataSourceName}

SELECT
COLUMN_NAME
columnName,
COLUMN_TYPE columnType,
DATA_TYPE dataType,
CHARACTER_MAXIMUM_LENGTH characterMaximumLength,
IS_NULLABLE
isNullable,
COLUMN_DEFAULT columnDefault,
COLUMN_COMMENT
columnComment
FROM
INFORMATION_SCHEMA.COLUMNS
WHERE
table_schema = #{dataSourceName}
AND table_name = #{tableName}

select
table_name,
table_schema as '数据库',
sum(table_rows) as '记录数',
sum(truncate(data_length/1024/1024/1024, 2)) as '数据容量(G)',
sum(truncate(index_length/1024/1024/1024, 2)) as '索引容量(G)'
from information_schema.tables
WHERE table_schema=#{tableName}

group by table_name
order by sum(data_length) desc;