数据库操作同步的方法

async queryData(){ 
  { 
    if (this.rdbStore == null) { 
      console.error(Create Store1.db failed! store1 is null); 
      return; 
    } 
  } 
  try { 
    let predicates: relationalStore.RdbPredicates = new relationalStore.RdbPredicates(“EMPLOYEE”); 
 
    let resultSet = await this.rdbStore.query(predicates); // 查询所有数据 
    console.info(Query data successfully! row count:${resultSet.rowCount}); 
    while (resultSet.goToNextRow()) { 
      const id = resultSet.getLong(resultSet.getColumnIndex(“ID”)); 
      const name = resultSet.getString(resultSet.getColumnIndex(“NAME”)); 
      const age = resultSet.getLong(resultSet.getColumnIndex(“AGE”)); 
      const salary = resultSet.getDouble(resultSet.getColumnIndex(“SALARY”)); 
      console.info(id=${id}, name=${name}, age=${age}, salary=${salary}); 
      const tmp = new ItemBean(name, age.toString(), salary.toString()); 
      this.dbSet.push(tmp); 
    } 
    resultSet.close(); 
  } catch (err) { 
    console.error(Query data failed! err code:${err.code}, err message:${err.message}) 
  } 
}