查询jComboBox所选表中符合条件的字段

请问以下查询语句对么，请指教？

strSQL = "select * from'"+ jComboBox.getSelectedItem().toString().trim()+"'";
strSQL = strSQL + " where'"+jComboBox.getSelectedItem().toString().trim()+"'.故障现象='" +jTextAreaXianx.getText().trim() + "'";