how to pass json array to select query - php

Question

I have json array as below
$q=[{"con0":0},{"con1":1},{"con2":2}]
I want to pass this array to select query where query is as follows
$query="select * from table_name where con0='0' and con1='1' and con2='2'";
Shall we use json array to create this query?

Answer 1

The two tricks are to turn the json into a php array via json_decode and then use reset() and key() functions to get the column and condition. Here is the live example:
http://ideone.com/wp1kb1 you can read more about key http://php.net/key and reset http://php.net/reset
<?php
$q='[{"con0":0},{"con1":1},{"con2":2}]';
$ar = json_decode($q, true);
$where = array();
foreach ($ar as $condition) {
$value = reset($condition);
$column = key($condition);
$where[] = " `$column` = " . (int) $value;
}
$whereString = implode(' AND', $where);
$query="select * from table_name where $whereString";
echo "\n $query \n";

Answer 2

Use json_decode to make this an object/array and then use a loop to make a string for that and append to the sql query.

Answer 3

Loop the JSON decoded data inside a foreach, then grab the key-value pair , store them in an array and after the end of the loop, do an implode() on the array with AND and now pass the string to your query as shown.
$json='[{"con0":0},{"con1":1},{"con2":2}]';
$qstr=array();
foreach(json_decode($json,true) as $k=>$arr)
{
$qstr[]="`".key($arr)."`"." = ".$arr[key($arr)];
}
$qstr = implode(' AND ',$qstr); //looks like `con0` = 0 AND `con1` = 1 AND `con2` = 2
$query="select * from table_name where ".$qstr;