Question

我有数百个MySQL表，我想用每个MySQL表的第一列创建一个ascii表。

来自MySQL表

table A          table B  ...  table Z
A1 A2 A3         B1 B2 B3      Z1 Z2 Z3
A1 A2 A3         B1 B2 B3      Z1 Z2 Z3
A1 A2 A3         B1 B2 B3      Z1 Z2 Z3

到ascii文件

A1 B1 ... Z1
A1 B1 ... Z1
A1 B1 ... Z1

哪种方法更快？

这些表有数百个，列有数千行，并且大多数列都有相同的行数（所以我不认为在出口之前是＆＃34;加入＆＃34;必要）

非常感谢

Answer 1

我不是bash专家，但我一步一步做事（其他专家可以编辑和改进我的答案）

#!/bin/bash
mysql -uusrname -ppassword -Ddatabasename -s -e 'show tables'
 count=0
while read tablenames
do
 fieldname=$(mysql -uusrname -ppassword -Ddatabasename -s -e "desc $tablename" | head -2 | tail -1  | awk -F " " '{print $1}');
 echo "$tablenames,$fieldname" >> tempfile
done< $(mysql -uusrname -ppassword -Ddatabasename -s -e 'show tables')
lastcount=$(wc -l tempfile)
while read line
 do
 count=$(($count + 1))
 if [ $count -eq 1 ] 
 then
 echo "nothing to do"
 elif [ $count -lt $lastcount ]
 then
 echo $line | awk -F "," '{print "(select "$2 "from" $1")"}' >> sqlcommand.sql
 echo "union" >> sqlcommand.sql
 else 
   echo $line | awk -F "," '{print "(select "$2 "from" $1");"}' >> sqlcommand.sql
 done < tempfile

 mysql -uusrname -ppassword -Ddatabasename << sqlcommand.sql >> outputasciifile.txt

将不同MySQL表的列粘贴到ascii文件中

1 个答案: