将 MySQL 表导出为 CSV 文件

Question

我有一个 MySQL 表，它必须作为 CSV 文件取出。我使用的查询是

SELECT "ID","NAME","SALARY","SAL1","SAL2","SAL3","SAL4","SAL5","SAL6","SAL7","SAL8","SAL9","SAL10","SAL11","SAL12","SAL13","SAL14","SAL15","SAL16","SAL17","SAL18","SAL19","SAL20","SAL21","SAL22","SAL23","SAL24","SAL25","SAL26"
UNION ALL
SELECT *
FROM addstock25
INTO OUTFILE "E:\\JOSE DATA\\addstock7.csv"
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n';

此查询有效，但如果我有 200 个列名怎么办？ 有没有办法不用手动输入？

Answer 1

此命令几乎可以满足您的需求，它甚至可以与远程服务器一起使用。唯一需要注意的是它会生成一个 TSV 文件（字段由制表符分隔）。

mysql mydb -e "select * from mytable" -B > mytable.tsv 

但您可以使用 sed 将其转换为 CSV，如 this answer 中的建议：

mysql mydb -e "select * from mytable" -B | sed "s/'/\'/;s/\t/\",\"/g;s/^/\"/;s/$/\"/;s/\n//g" > mytable.csv

Answer 2

我不明白你为什么不能这样做

SELECT *
FROM addstock25
INTO OUTFILE "E:\\JOSE DATA\\addstock7.csv"
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n'

Answer 3

DESCRIBE addstock25;

删除第一列和该列的前三个条目（这取决于您的使用情况）。您将获得 addstock25 中的字段列表。

这将只使用在核心中派生的虚拟表带来字段名称...称为信息架构。

SELECT `COLUMN_NAME` 
FROM `INFORMATION_SCHEMA`.`COLUMNS` 
WHERE `TABLE_NAME`='foo';

假设这个查询的名称是 sq_fieldnamelist。

所以，上面的表只有一列，它有“foo”表的字段名。

如果直接写like

SELECT (sq_fieldnamelist)
UNION ALL
SELECT *
FROM addstock25
INTO OUTFILE "E:\\JOSE DATA\\addstock7.csv"
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n

MySQL 会报错。 "子查询返回多行"

我们必须编辑 sq_fieldnamelist 以将所有条目背靠背连接起来，用逗号分隔。

Select GROUP_CONCAT(COLUMN_NAME)
FROM
(SELECT `COLUMN_NAME` 
FROM `INFORMATION_SCHEMA`.`COLUMNS` 
WHERE `TABLE_NAME`='ffd_companies'
LIMIT 3,100
) AS fafa
GROUP BY 'COLUMN_NAME' // This group by is just to make group concatenation work

假设这是 sq_fieldnamelist2。

如果我们像这样编辑 sq_fieldnamelist，它将只返回一个值，即所有字段名称用逗号分隔。所以现在我们可以把这个子查询放在你的 select 语句中来获取所需的字段。

SELECT (sq_fieldnamelist2)
UNION ALL
SELECT *
FROM addstock25
INTO OUTFILE "E:\\JOSE DATA\\addstock7.csv"
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n

您需要根据自己的目的在 sq_fieldnamelist2 中编辑 LIMIT 3,100。

假设您的表是 fil1、fil2...filN、sal1、sal2、sal3....、salI。要查看唯一的薪水字段，您应该使用LIMIT N, x > I+N。如果要查看全部，请使用LIMIT 0, x > N+I。

Answer 4

我认为您正在寻找类似的东西。

SET @sql = NULL;
SELECT GROUP_CONCAT("'",COLUMN_NAME,"'")
 FROM
(SELECT `COLUMN_NAME`
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE `TABLE_SCHEMA` = 'yourdatabasename'
and `TABLE_NAME`='ffd_companies'
) AS colnames
GROUP BY 'COLUMN_NAME'
into @sql;

SET @sql = concat ("SELECT", @sql, " from dual
UNION ALL
SELECT *
FROM addstock25
INTO OUTFILE 'E:\\JOSE DATA\\addstock7.csv'
FIELDS TERMINATED BY ','
ENCLOSED BY '", '"',"'
)"
);

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

请注意，我添加了 WHERE 子句 TABLE_SCHEMA = 'yourdatabasename'。

Answer 5

可以使用“表数据导出向导”并从那里复制选择的 SQL；