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

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();
}

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