Home >Java >javaTutorial >Why Am I Getting a 'MySQL Syntax Error near '?'' with PreparedStatement in Java?

Why Am I Getting a 'MySQL Syntax Error near '?'' with PreparedStatement in Java?

Susan Sarandon
Susan SarandonOriginal
2024-12-11 15:43:11341browse

Why Am I Getting a

MySQL Syntax Error: "You Have an Error in Your SQL Syntax" When Executing PreparedStatement

When executing a query using a PreparedStatement, users may encounter a "MySQLSyntaxErrorException near "?"" error. This error signifies a syntax error in the SQL query.

In this specific issue, the code attempts to substitute the query parameters using the '?`占位符, but the PreparedStatement isn't correctly replacing these placeholders.

The issue lies in the executeQuery() method call. The code overwrites the prepared query with the original query by calling s.executeQuery(query) instead of s.executeQuery(). The argumentless executeQuery() method should be used to execute the prepared query.

PreparedStatement s = conn.prepareStatement(query);
s.setInt(1, intValue);
s.setString(2, strValue);        
rs = s.executeQuery(); // Correct

Additionally, the code may be leaking resources due to unclosed connections, statements, and result sets. Resources should be closed in a finally block to prevent resource exhaustion.

try {
  ...
} finally {
  if (rs != null) rs.close();
  if (s != null) s.close();
  if (conn != null) conn.close();
}

The above is the detailed content of Why Am I Getting a 'MySQL Syntax Error near '?'' with PreparedStatement in Java?. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn