Looking for a cleaner way to run a query that has to check for multiple "AND" conditions - mysql

Question

I'm running a query against a database and have to check for multiple conditions to be true. The code I have pulls the data I want, but if I had to check many more columns, it could get out of control very quickly. I don't want a query that where I have to write out a dozen or so "AND" conditions. I'm learning some MySQL as I go and any help would be appreciated.
<?php
$servername = "localhost";
$username = "xxxx";
$password = "xxxx";
$dbname = "oldga740_SeniorProject";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
//Set up and run my Query
$sql = "SELECT Project, Client, DateReceived, LastName, FinalReviewDate FROM Projects
WHERE FinalReviewDate IS NOT NULL
AND DateDelivered IS NULL
AND DateAccepted IS NULL
ORDER BY DateAccepted DESC";
$result = $conn->query($sql);
//Display results
if ($result->num_rows > 0) {
echo "<table><tr><th>Client</th><th>Project</th><th>Point of Contact</th><th>Date Project Received</th><th>Final Review Date</th></tr>";
// output data of each row
while($row = $result->fetch_assoc()) {
echo "<tr><td>" . $row["Client"]. "</td><td>" . $row ["Project"]. "</td><td> " . $row["LastName"]. "</td><td> " . $row ["DateReceived"]. "</td><td> " . $row["FinalReviewDate"]. "</td></tr>";
}
echo "</table>";
} else {
echo "0 results";
}
$conn->close();
?>

Answer 1

You can use an array for your and conditions. But in general you have to be careful if you are going to have prepared statements and bind values. Also, you can create your WHERE clause dynamically in a similar way like the following:
EDIT:
$where = array(
array(
'column'=>'FinalReviewDate',
'operator'=>'AND',
'condition'=>'IS NOT NULL',
'value'=>'',
),
array(
'column'=>'DateDelivered',
'operator'=>'AND',
'condition'=>'IS NULL',
'value'=>'',
),
array(
'column'=>'DateAccepted',
'operator'=>'AND',
'condition'=>'IS NULL',
'value'=>'',
),
array(
'column'=>'other_column',
'operator'=>'OR',
'condition'=>'>=',
'value'=>5,
),
);
$temp = array();
foreach($where as $key => $value) {
if ($value['value'] == '') {
$temp[] = $value['operator'].' '.$value['column'].' '.$value['condition'];
} else {
$temp[] = $value['operator'].' '.$value['column'].' '.$value['condition'].' '.$value['value'];
}
}
$where_sql = '1 = 1 '.implode(' ', $temp);
echo $where_sql;
Result:
1 = 1 AND FinalReviewDate IS NOT NULL AND DateDelivered IS NULL AND DateAccepted IS NULL OR other_column >= 5
OLD ANSWER
$ands = array(
array(
'column'=>'FinalReviewDate',
'condition'=>'IS NOT NULL'
),
array(
'column'=>'DateDelivered',
'condition'=>'IS NULL'
),
array(
'column'=>'DateAccepted',
'condition'=>'IS NULL'
),
);
$temp = array();
foreach($ands as $key => $value) {
$temp[] = $value['column'].' '.$value['condition'];
}
$and_sql = implode(' AND ', $temp);
echo $and_sql;
Result:
FinalReviewDate IS NOT NULL AND DateDelivered IS NULL AND DateAccepted IS NULL