MySQL SELECT在JDBC中不起作用

Question

我有这个MySQL查询

SELECT 
    kompetence.kompetence_odlisujici_subcategories.nazev as odlisujici_nazev, 
    tolerovana, 
    zadana, 
    aktualni
FROM kompetence_odlisujici, kompetence.kompetence_odlisujici_subcategories
WHERE kompetence_odlisujici.os_cislo_zamestnanec = ? 
AND tolerovana <> 0 
AND zadana <> 0 
AND aktualni <> 0 
AND year = ? 
AND IPR.kompetence_odlisujici.active = 1
AND kompetence.kompetence_odlisujici_subcategories.id = PR.kompetence_odlisujici.id_odlisujici_subcategory

如果我在MySQL Workbench中尝试它，它工作正常，但当我尝试在我的java代码中使用它时，我得到这个错误

SQLException :You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE kompetence_odlisujici.os_cislo_zamestnanec = '123456' AND tolerovana <> 0 ' at line 1

我究竟做错了什么？

谢谢你的帮助。

编辑 java代码

DataSourcePool dspService = sling.getService(DataSourcePool.class);
DataSource dsMySql = (DataSource) dspService.getDataSource("myConnection");
PreparedStatement preparedStatement = null;
if(dsMySql != null){
String sqlQuery = "SELECT kompetence.kompetence_odlisujici_subcategories.nazev as odlisujici_nazev, tolerovana, zadana, aktualni"+
                "FROM IPR.kompetence_odlisujici, kompetence.kompetence_odlisujici_subcategories "+
                "WHERE IPR.kompetence_odlisujici.os_cislo_zamestnanec = ? AND tolerovana <> 0 AND zadana <> 0 AND aktualni <> 0 AND year = ? AND IPR.kompetence_odlisujici.active = 1"+
                "AND kompetence.kompetence_odlisujici_subcategories.id = IPR.kompetence_odlisujici.id_odlisujici_subcategory";
  Connection mySqlConnection = mySqlConnection = dsMySql.getConnection();
    preparedStatement = mySqlConnection.prepareStatement(sqlQuery);
  String workingUser = this.getWorkingUser();
  int year = Calendar.getInstance().get(Calendar.YEAR);
    preparedStatement.setString(1, workingUser);
    preparedStatement.setInt(2, year);
  ResultSet resultSet = preparedStatement.executeQuery();
  resultSet.last();
    int count = resultSet.getRow();
    resultSet.beforeFirst();
  /*
  parse result set here
  */
}

Answer 1

String sqlQuery = "SELECT kompetence.kompetence_odlisujici_subcategories.nazev as odlisujici_nazev, tolerovana, zadana, aktualni "+
                "FROM IPR.kompetence_odlisujici, kompetence.kompetence_odlisujici_subcategories "+
                "WHERE IPR.kompetence_odlisujici.os_cislo_zamestnanec = ? AND tolerovana <> 0 AND zadana <> 0 AND aktualni <> 0 AND year = ? AND IPR.kompetence_odlisujici.active = 1 "+
                "AND kompetence.kompetence_odlisujici_subcategories.id = IPR.kompetence_odlisujici.id_odlisujici_subcategory";

aktualni和FROM之间没有空格， IPR.kompetence_odlisujici.active = 1和AND kompetence.kompetence_odlisujici_subcategories.id = IPR.kompetence_odlisujici.id_odlisujici_subcategory之间没有空格。

另外我的建议是你在课堂上将这些查询作为private static final 。