Database Error

What This Error Means

This error occurs when the number of parameters in a SQL query does not match the number of placeholders (represented by ?) in the query.

Why It Happens

This error typically happens when a query is being executed with an incorrect number of parameters, often due to a mismatch between the expected number of parameters and the actual number used in the execution.

How to Fix It

1. 1To fix this error, ensure that the number of parameters in the query matches the number of placeholders in the query. Typically, this involves checking the query and the list of parameters being passed to the query execution method, and adjusting one or the other to match.

Example Code Solution

PreparedStatement statement = connection.prepareStatement("SELECT * FROM users WHERE username = ? AND email = ?");
String[] params = new String[1];
statement.setString(1, username);

PreparedStatement statement = connection.prepareStatement("SELECT * FROM users WHERE username = ? AND email = ?");
String[] params = new String[2];
params[0] = username;
params[1] = email;
statement.setString(1, params[0]);
statement.setString(2, params[1]);