将mysql结果存储在bash数组变量中

I am trying to store MySQL result into a global bash array variable but I don't know how to do it.

我正在尝试将MySQL结果存储到一个全局bash数组变量中，但是我不知道怎么做。

Should I save the MySQL command result in a file and read the file line by line in my for loop for my other treatment?

我应该将MySQL命令保存到一个文件中，并在for循环中逐行读取文件，以便进行其他处理吗?

Example:

例子:

#Database, table uses

user password
Pierre aaa
Paul bbb

Command:

命令:

$results = $( mysql –uroot –ppwd –se  « SELECT * from users );

I want that results contains the two rows.

我希望结果包含这两行。

2 个解决方案

#1

Mapfile for containing whole table into one bash variable

You could try this:

你可以试试这个:

mapfile result < <(mysql –uroot –ppwd –se  "SELECT * from users;")

Than

比

echo ${result[0]%$'\t'*}
echo ${result[0]#*$'\t'}

or

或

for row in "${result[@]}";do
    echo Name:  ${row%$'\t'*}  pass: ${row#*$'\t'}
done

Nota This will work fine while there is only 2 fields by row. More is possible but become tricky

当一行只有两个字段时，这将会正常工作。更多是可能的，但会变得棘手

Read for reading table row by row

while IFS=$'\t' read name pass ;do
    echo name:$name pass:$pass
  done  < <(mysql -uroot –ppwd –se  "SELECT * from users;")

Read and loop to hold whole table into many variables:

i=0
while IFS=$'\t' read name[i] pass[i++];do
    :;done  < <(mysql -uroot –ppwd –se  "SELECT * from users;")

echo ${name[0]} ${pass[0]}
echo ${name[1]} ${pass[1]}

#2

1. If you're looking to get a global variable inside your script you can simply assign a value to a varname:

   如果您希望在脚本中获得全局变量，可以简单地为varname分配一个值:

   VARNAME=('var' 'name') # no space between the variable name and value
   

   Doing this you'll be able to access VARNAME's value anywhere in your script after you initialize it.

   这样，在初始化VARNAME后，您就可以在脚本中的任何地方访问它的值。

2. If you want your variable to be shared between multiple scripts you have to use export:

   如果想要在多个脚本之间共享变量，则必须使用导出:

   script1.sh:

   script1.sh:

   export VARNAME=('var' 'name')
   echo ${VARNAME[0]} # will echo 'var'
   

   script2.sh

   script2.sh

   echo ${VARNAME[1]} # will echo 'name', provided that 
                      # script1.sh was executed prior to this one
   

NOTE that export will work only when running scripts in the same shell instance. If you want it to work cross-instance you would have to put the export variable code somewhere in .bashrc or .bash_profile

注意，导出仅在在同一shell实例中运行脚本时才会工作。如果您想让它在跨实例中工作，您必须将导出变量代码放在.bashrc或.bash_profile中的某个位置