How do you check if SQL result is empty in PHP?

How do you check if SQL result is empty in PHP?

PHP empty() Function The empty() function checks whether a variable is empty or not. This function returns false if the variable exists and is not empty, otherwise it returns true.

How do I check if a SQL query is empty?

The IS NULL condition is used in SQL to test for a NULL value. It returns TRUE if a NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.

Is null in PHP MySQL?

MySQL: IS NULL Condition

• Description. The MySQL IS NULL Condition is used to test for a NULL value in a SELECT, INSERT, UPDATE, or DELETE statement.
• Syntax.
• Note.
• Example – With SELECT Statement.
• Example – With INSERT Statement.
• Example – With UPDATE Statement.
• Example – With DELETE Statement.

How do you check if MySQL result is empty?

SELECT * FROM yourTableName WHERE yourSpecificColumnName IS NULL OR yourSpecificColumnName = ‘ ‘; The IS NULL constraint can be used whenever the column is empty and the symbol ( ‘ ‘) is used when there is empty value.

How check variable is empty in PHP?

Answer: Use the PHP empty() function You can use the PHP empty() function to find out whether a variable is empty or not. A variable is considered empty if it does not exist or if its value equals FALSE .

What is a NULL value in SQL?

A null value in a relational database is used when the value in a column is unknown or missing. A null is neither an empty string (for character or datetime data types) nor a zero value (for numeric data types).

Is NULL or empty PHP?

empty() function in PHP? The isset() function is an inbuilt function in PHP which checks whether a variable is set and is not NULL. This function also checks if a declared variable, array or array key has null value, if it does, isset() returns false, it returns true in all other possible cases.

IS NULL function in PHP?

The is_null() function checks whether a variable is NULL or not. This function returns true (1) if the variable is NULL, otherwise it returns false/nothing.

How can I tell if MySQL insert was successful in PHP?

To check if your INSERT was successful, you can use mysqli_affected_rows() . Returns the number of rows affected by the last INSERT, UPDATE, REPLACE or DELETE query. Your present code is open to SQL injection if user interaction is involved. Use mysqli with prepared statements, or PDO with prepared statements.

How do I check if a table is NULL in SQL?

How to Test for NULL Values?

1. SELECT column_names. FROM table_name. WHERE column_name IS NULL;
2. SELECT column_names. FROM table_name. WHERE column_name IS NOT NULL;
3. Example. SELECT CustomerName, ContactName, Address. FROM Customers. WHERE Address IS NULL;
4. Example. SELECT CustomerName, ContactName, Address. FROM Customers.