mysql查詢所有表和字段信息的方法：

1、根據(jù)庫(kù)名獲取所有表的信息

SELECT

*

FROM

information_schema.`TABLES`

WHERE

TABLE_SCHEMA = 'erp';

2、根據(jù)庫(kù)名獲取所有表名稱和表說(shuō)明

SELECT

TABLE_NAME,

TABLE_COMMENT

FROM

information_schema.`TABLES`

WHERE

TABLE_SCHEMA = 'erp';

view:

3、根據(jù)庫(kù)名獲取所有的字段信息

SELECT

TABLE_SCHEMA AS '庫(kù)名',

TABLE_NAME AS '表名',

COLUMN_NAME AS '列名',

ORDINAL_POSITION AS '列的排列順序',

COLUMN_DEFAULT AS '默認(rèn)值',

IS_NULLABLE AS '是否為空',

DATA_TYPE AS '數(shù)據(jù)類(lèi)型',

CHARACTER_MAXIMUM_LENGTH AS '字符最大長(zhǎng)度',

NUMERIC_PRECISION AS '數(shù)值精度(最大位數(shù))',

NUMERIC_SCALE AS '小數(shù)精度',

COLUMN_TYPE AS 列類(lèi)型,

COLUMN_KEY 'KEY',

EXTRA AS '額外說(shuō)明',

COLUMN_COMMENT AS '注釋'

FROM

information_schema.`COLUMNS`

WHERE

TABLE_SCHEMA = 'erp'

ORDER BY

TABLE_NAME,

ORDINAL_POSITION;

view:

4、根據(jù)庫(kù)名獲取所有的庫(kù)和表字段的基本信息

SELECT

C.TABLE_SCHEMA AS '庫(kù)名',

T.TABLE_NAME AS '表名',

T.TABLE_COMMENT AS '表注釋',

C.COLUMN_NAME AS '列名',

C.COLUMN_COMMENT AS '列注釋',

C.ORDINAL_POSITION AS '列的排列順序',

C.COLUMN_DEFAULT AS '默認(rèn)值',

C.IS_NULLABLE AS '是否為空',

C.DATA_TYPE AS '數(shù)據(jù)類(lèi)型',

C.CHARACTER_MAXIMUM_LENGTH AS '字符最大長(zhǎng)度',

C.NUMERIC_PRECISION AS '數(shù)值精度(最大位數(shù))',

C.NUMERIC_SCALE AS '小數(shù)精度',

C.COLUMN_TYPE AS 列類(lèi)型,

C.COLUMN_KEY 'KEY',

C.EXTRA AS '額外說(shuō)明'

FROM

information_schema.`TABLES` T

LEFT JOIN information_schema.`COLUMNS` C ON T.TABLE_NAME = C.TABLE_NAME

AND T.TABLE_SCHEMA = C.TABLE_SCHEMA

WHERE

T.TABLE_SCHEMA = 'erp'

ORDER BY

C.TABLE_NAME,

C.ORDINAL_POSITION;

view:

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