MySQL生成数据库设计表格

查询单个 指定数据库和数据库表

SET @db_name = 'test';

SET @table_name = 'sys_user';
SELECT
	COLUMN_NAME 字段名称,
	COLUMN_TYPE 字段类型,
IF
	(
		COLUMN_NAME IN ( SELECT COLUMN_NAME FROM information_schema.KEY_COLUMN_USAGE AS T WHERE T.table_schema = @db_name AND T.table_name = @table_name ),
		'PRIMARY KEY',
	IF
		( IS_NULLABLE = 'NO', 'NOT NULL', 'NULL' )
	) AS 字段约束,
	COLUMN_COMMENT 字段注释
FROM
	INFORMATION_SCHEMA.COLUMNS
WHERE
	table_schema = @db_name
	AND table_name = @table_name;

查询多个 指定数据库

SET @db_name = 'test';
SELECT
	CONCAT( 'SELECT COLUMN_NAME 字段名称, COLUMN_TYPE 字段类型, IF ( COLUMN_NAME IN ( SELECT COLUMN_NAME FROM information_schema.KEY_COLUMN_USAGE AS T WHERE T.table_schema = \'', @db_name, '\' AND T.table_name = \'', table_name, '\' ), \'PRIMARY KEY\', IF ( IS_NULLABLE = \'NO\', \'NOT NULL\', \'NULL\' ) ) AS 字段约束, COLUMN_COMMENT 字段注释 FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = \'', @db_name, '\' AND table_name = \'', table_name, '\';' )
FROM
	information_schema.TABLES
WHERE
	table_schema = @db_name;

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但是还不够方便 如下为使用EXECUTE执行GROUP_CONCAT拼接的OUTFILE语句直接输出到文件
PS: 搞了好长时间 主要是修改配置文件和一些报错

SET @db_name = 'test';
SELECT
	@SQL := CONCAT(
		'SELECT * INTO OUTFILE \'/data/all.xlsx\' FIELDS TERMINATED BY \'\t\' FROM (',
		GROUP_CONCAT(
			CONCAT( 'SELECT \'表名 -> ', table_name, '\' AS 字段名称, \'描述 -> ',table_comment,'\' AS 字段类型, \'+\' AS 字段约束, \'-\' AS 字段注释 UNION ALL SELECT COLUMN_NAME, COLUMN_TYPE, IF ( COLUMN_NAME IN ( SELECT COLUMN_NAME FROM information_schema.KEY_COLUMN_USAGE AS T WHERE T.table_schema = \'', @db_name, '\' AND T.table_name = \'', table_name, '\' ), \'PRIMARY KEY\', IF ( IS_NULLABLE = \'NO\', \'NOT NULL\', \'NULL\' ) ), COLUMN_COMMENT FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = \'', @db_name, '\' AND table_name = \'', table_name, '\'' ) SEPARATOR ' UNION ALL '
		),
		') a'
	)
FROM
	information_schema.TABLES
WHERE
	table_schema = @db_name # 此处条件可自行修改
	AND table_name NOT LIKE '%act_%';
PREPARE _sql
FROM
	@SQL;
EXECUTE _sql;

如下配置生效要重启mysql服务 systemctl restart mysql

ERROR 1290 (HY000): The MySQL server is running with the --secure-file-priv option so it cannot execute this statement
需要配置secure-file-priv 编辑mysql的my.cnf在[mysqld]修改或添加 无[mysqld]请手动创建
secure-file-priv为null(默认值) 不允许导入|导出
secure_file_priv为/data 导入|导出只能发生在/tmp/目录下
secure_file_priv没有值 表示不对导入|导出做限制

Can’t create/write to file ‘/data/text.csv’ (Errcode: 13 - Permission denied)
说明没有权限操作 好像是上面的配置没有全部生效 通过设置tmpdir可解决 有更好的解决方式我在更新
tmpdir = /data # 同样是在[mysqld]下修改或增加

如果最后显示的sql语句不全可能是GROUP_CONCAT的限制太小 有的人说设为-1为无限制 但是我的还是显示不全
group_concat_max_len=99999 # 同样是在[mysqld]下修改或增加

Duplicate column name ‘xxxx’ 别名重复 重复字段名称起个别名即可

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结果图如下