Why Does My PreparedStatement in Java Throw a MySQL Syntax Error?

PreparedStatement Syntax Error

In Java, PreparedStatements offer enhanced safety and performance for parameterized SQL queries. However, encountering syntax errors with PreparedStatements can be frustrating.

In this particular case, the original code raises a MySQL syntax error when attempting to execute the following SQL:

SELECT `value` FROM `sampling_numbers` WHERE `value` < (?)

The error's root cause lies in the incorrect usage of stmt.executeQuery(sql);, which calls the Statement method instead of the intended PreparedStatement method. To resolve this issue, simply modify the code to use:

return this.stmt.executeQuery();

This correction ensures that the PreparedStatement's parameters are properly bound and the SQL query is executed correctly.

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