react native：将数据从 promise 函数发送到 const 的方法是什么？尝试 console.log 时出错

Question

从“Get_Successor_Zones_From_Table”承诺函数发送数据的方式是什么 进入变量 const 数据？ 我只需要“Zone_Name”。

这个数据是一个对象列表，它们看起来像这样： [{"Zone_ID":66,"Zone_Name":"Herzel"},{"Zone_ID":0123,"Zone_Name":"Zelda"}]

async Get_Successor_Zones_From_Table() {
    const Zone_Names = [];
    const promise = new Promise((resolve, reject) => {
      db.transaction((tx) => {
        tx.executeSql(
          'SELECT Successor_Zones FROM tblUserConnectResponseData',
          [],
          (_, result) => {
            var len = result.rows.length;
            for (let i = 0; i < len; i++) {
              let row = result.rows.item(i);
              // console.log();
              const { Successor_Zones } = row;
              Zone_Names.push({
                Successor_Zones,
              });
            }
            resolve({
              isAny: true,
              Zone_Names: row,
            });
          },
          (_, err) => {
            reject(err);
          }
        );
      });
    });
    return promise;
  }

我添加这样的按钮：

<TouchableOpacity
                  onPress={() => {
                    this.setState({ activeIndex: 0 });
                    this.Get_Successor_Zones_From_Table.then((result) => {
                      console.log(result);
                    }).catch((error) => console.log(error));
                  }}
                  activeOpacity={1}
                  style={
                    this.state.activeIndex === 0
                      ? styles.button
                      : styles.button2
                  }
                >
                  <Text style={styles.textButton}>list of places</Text>
                </TouchableOpacity>

Answer 1

你的声明

async Get_Successor_Zones_From_Table() {

打电话

this.Get_Successor_Zones_From_Table.then((result) => {
    console.log(result)
}).catch(error => console.log(error))

Answer 2

  const [zoneNames, setZoneNames] = useState();

  const Get_Successor_Zones_From_Table = () => {
    let Zone_Names = [];
    return new Promise((resolve, reject) => {
      db.transaction(tx => {
        // ...
      });
    });
  };

然后

Get_Successor_Zones_From_Table.then(data => setZoneNames(data));