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mysql查询所有表和字段信息的方法：1、根据库名获取所有表的信息【information_schema.`TABLES`】；2、根据库名获取所有的字段信息【ORDINAL_POSITION AS '列的排列顺序'】。

mysql查询所有表和字段信息的方法：

1、根据库名获取所有表的信息

SELECT *FROM information_schema.`TABLES`WHERE TABLE_SCHEMA = 'erp';

2、根据库名获取所有表名称和表说明

SELECT TABLE_NAME, TABLE_COMMENTFROM information_schema.`TABLES`WHERE TABLE_SCHEMA = 'erp';

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3、根据库名获取所有的字段信息

SELECT TABLE_SCHEMA AS '库名', TABLE_NAME AS '表名', COLUMN_NAME AS '列名', ORDINAL_POSITION AS '列的排列顺序', COLUMN_DEFAULT AS '默认值', IS_NULLABLE AS '是否为空', DATA_TYPE AS '数据类型', CHARACTER_MAXIMUM_LENGTH AS '字符最大长度', NUMERIC_PRECISION AS '数值精度(最大位数)', NUMERIC_SCALE AS '小数精度', COLUMN_TYPE AS 列类型, COLUMN_KEY 'KEY', EXTRA AS '额外说明', COLUMN_COMMENT AS '注释'FROM information_schema.`COLUMNS`WHERE TABLE_SCHEMA = 'erp'ORDER BY TABLE_NAME, ORDINAL_POSITION;

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4、根据库名获取所有的库和表字段的基本信息

SELECT C.TABLE_SCHEMA AS '库名', T.TABLE_NAME AS '表名', T.TABLE_COMMENT AS '表注释', C.COLUMN_NAME AS '列名', C.COLUMN_COMMENT AS '列注释', C.ORDINAL_POSITION AS '列的排列顺序', C.COLUMN_DEFAULT AS '默认值', C.IS_NULLABLE AS '是否为空', C.DATA_TYPE AS '数据类型', C.CHARACTER_MAXIMUM_LENGTH AS '字符最大长度', C.NUMERIC_PRECISION AS '数值精度(最大位数)', C.NUMERIC_SCALE AS '小数精度', C.COLUMN_TYPE AS 列类型, C.COLUMN_KEY 'KEY', C.EXTRA AS '额外说明'FROM information_schema.`TABLES` TLEFT JOIN information_schema.`COLUMNS` C ON T.TABLE_NAME = C.TABLE_NAMEAND T.TABLE_SCHEMA = C.TABLE_SCHEMAWHERE T.TABLE_SCHEMA = 'erp' ORDER BY C.TABLE_NAME, C.ORDINAL_POSITION;

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