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Description

This error occurs when a client application attempts to retrieve data from a MySQL statement that has not generated a result set, or from a result set that has already been processed or closed. It typically indicates a logical flaw in the application's data retrieval flow, where a fetch operation is called prematurely or on an invalid statement handle.

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Error Message

Attempt to read a row while there is no result set associated with the statement

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Known Causes

3 known causes

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Failed Statement Execution

The SQL statement either failed to execute successfully or was never executed before the application attempted to retrieve results.

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Premature Data Fetch Attempt

The client application called a fetch or read operation on a statement before a valid result set was created by a successful execute() call.

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Invalidated Result Set

The result set handle became invalid or was closed by the application or the database system before all expected data could be retrieved.

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Solutions

3 solutions available

1. Ensure a SELECT Statement is Executed easy

This error occurs when attempting to fetch results from a statement that does not produce a result set, such as INSERT, UPDATE, DELETE, or DDL statements.

1

Verify that the SQL statement you are executing is a `SELECT` query. If you are performing an operation that modifies data (like `INSERT`, `UPDATE`, `DELETE`) or alters the database schema (like `CREATE TABLE`, `ALTER TABLE`), these statements do not return rows and therefore will not have an associated result set.

SELECT column1, column2 FROM your_table WHERE condition;

2

If your application logic requires fetching data after a modification, execute a separate `SELECT` statement after the modification is complete.

-- Example: Insert a new record and then select it
INSERT INTO your_table (column1, column2) VALUES ('value1', 'value2');
SELECT LAST_INSERT_ID();

2. Check Client Application Logic for Result Set Handling medium

Client libraries and applications often expect a result set after executing SQL. If the application code tries to fetch rows from a statement that doesn't return them, this error will occur.

1

Review the code in your application that interacts with the MySQL database. Identify the exact SQL statement being executed.

2

Ensure that the code attempting to fetch results (e.g., `fetch()`, `fetchall()`, `next()`, `get_result()`) is only called when a `SELECT` statement has been executed.

// Example in Python with mysql.connector:
cursor.execute('SELECT * FROM users')
results = cursor.fetchall() # This is correct for SELECT

# Incorrect: Trying to fetch results from an UPDATE statement
cursor.execute('UPDATE users SET status = "active" WHERE id = 1')
# results = cursor.fetchall() # This would cause Error 2053

3

If you are using a stored procedure, ensure that the stored procedure itself executes a `SELECT` statement if you intend to retrieve data from it. Otherwise, the calling code might incorrectly expect a result set.

-- Example Stored Procedure that returns a result set
DELIMITER $$
CREATE PROCEDURE GetUserById(IN userId INT)
BEGIN
    SELECT * FROM users WHERE id = userId;
END $$
DELIMITER ;

-- Calling the procedure to get results
CALL GetUserById(1);

3. Examine Stored Procedure or Trigger Execution Flow medium

Stored procedures and triggers can sometimes execute statements that don't return result sets, leading to this error if the calling code expects one.

1

If the error occurs when calling a stored procedure, inspect the stored procedure's definition. Look for any `INSERT`, `UPDATE`, `DELETE`, or DDL statements within the procedure.

SHOW CREATE PROCEDURE your_procedure_name;

2

If a stored procedure or trigger performs modifications and is called by application code that then tries to fetch results as if a `SELECT` was executed, you'll need to adjust the application logic or the procedure/trigger.

DELIMITER $$
CREATE PROCEDURE UpdateAndNotify(IN userId INT, IN newStatus VARCHAR(50))
BEGIN
    UPDATE users SET status = newStatus WHERE id = userId;
    -- If you need to return something, consider returning a status code or affected rows count
    SELECT ROW_COUNT() AS affected_rows;
END $$
DELIMITER ;

-- Application code needs to handle the result of ROW_COUNT() if that's what's returned, not fetch rows.

3

For triggers, understand that they execute implicitly. If a trigger modifies data, and the statement that fired the trigger is then followed by a `SELECT` in the application, ensure the trigger's actions don't interfere with the expected result set.

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Related Errors

5 related errors

MySQL Error 2053: No Associated Result Set