Read MySQL result set with multiple columns and spaces - mysql

Question

Pretend I have a MySQL table test that looks like:
+----+---------------------+
| id | value |
+----+---------------------+
| 1 | Hello World |
| 2 | Foo Bar |
| 3 | Goodbye Cruel World |
+----+---------------------+
And I execute the query SELECT id, value FROM test.
How would I assign each column to a variable in Bash using read?
read -a truncates everything after the first space in value:
mysql -D "jimmy" -NBe "SELECT id, value FROM test" | while read -a row;
do
id="${row[0]}"
value="${row[1]}"
echo "$id : $value"
done;
and output looks like:
1 : Hello
2 : Foo
3 : Goodbye
but I need it to look like:
1 : Hello World
2 : Foo Bar
3 : Goodbye Cruel World
I'm aware there are args I could pass to MySQL to format the results in table format, but I need to parse each value in each row. This is just a simplified example of my problem.

Answer 1

Use individual fields in the read loop instead of the array:
mysql -D "jimmy" -NBe "SELECT id, value FROM test" | while read -r id value;
do
echo "$id : $value"
done
This will make sure that id will be read into the id field and everything else would be read into the value field - that's how read behaves when input has more fields than the number of variables being read into. If there are more columns to be read, using a delimiter (such as #) that doesn't clash with actual data would help:
mysql -D "jimmy" -NBe "SELECT CONCAT(id, '#', value, '#', column3) FROM test" | while IFS='#' read -r id value column3;
do
echo "$id : $value : $column3"
done

Answer 2

You can do this, also avoid piping a command to a while read loop if possible to avoid creating a subshell.
while read -r line; do
id=$(echo $line | awk '{print $1}')
value=$(echo $line | awk '{print $1=""; print $0}'|sed ':a;N;$!ba;s/\n/ /g'| sed 's/^[ \t]*//g')
echo "ID: $id"
echo "VALUE: $value"
done< <(mysql -D "jimmy" -NBe "SELECT id, value FROM test")
If you want to store all the id's and values in an array for later use, you can modify it to look like this.
#!/bin/bash
declare -A -g arr
while read -r line; do
id=$(echo $line | awk '{print $1}')
value=$(echo $line | awk '{print $1=""; print $0}'|sed ':a;N;$!ba;s/\n/ /g'| sed 's/^[ \t]*//g')
arr[$id]=$value
done< <(mysql -D "jimmy" -NBe "SELECT id, value FROM test")
for key in "${!arr[#]}"; do
echo "$key: ${arr[$key]}"
done
Which gives you this output
dumbledore#ansible1a [OPS]:~/tmp/tmp > bash test.sh
1: Hello World
2: Foo Bar
3: Goodbye Cruel World