Question

我正在编码的函数将从其他javascript文件中调用，并且字段和值将传递给包含表名的函数。但是当我运行该函数时，它只会给出错误而不会显示此错误消息

    We have encounter an Error WebSQLTransaction { "_complete": false, "_error": null, "_running": true, "_runningTimeout": false, "_sqlQueue": Queue { "first": undefined, "last": undefined, "length": 0, }, "_websqlDatabase": WebSQLDatabase { "_currentTask": TransactionTask { "errorCallback": [Function anonymous], "readOnly": false, "successCallback": [Function anonymous], "txnCallback": [Function anonymous], }, "_db": SQLiteDatabase { "_closed": false, "_name": "mydb.db", }, "_running": true, "_txnQueue": Queue { "first": Object { "item": TransactionTask { "errorCallback": [Function anonymous], "readOnly": false, "successCallback": [Function anonymous], "txnCallback": [Function anonymous], }, "next": Object { "item": TransactionTask { "errorCallback": [Function anonymous], "readOnly": false, "successCallback": [Function anonymous], "txnCallback": [Function anonymous], }, "next": Object { "item": TransactionTask { "errorCallback": [Function anonymous], "readOnly": false, "successCallback": [Function anonymous], "txnCallback": [Function anonymous], }, }, }, }, "last": Object { "item": TransactionTask { "errorCallback": [Function anonymous], "readOnly": false, "successCallback": [Function anonymous], "txnCallback": [Function anonymous], }, }, "length": 3, }, "version": "1.0", }, }

因此，我要使用JavaScript React native来构建它，并要使用expo SDK。 Expo随SQLite模块一起提供，再次要做的是构建一个可以从代码中的任何位置调用的函数，并将一些数据存储到数据库中。

   export const insert = (tbl, fields, values) =>{
    const query = "insert into ${tbl} (${fields}) values (${values});";
    console.log(query);
    //it looks fine to me
    db.transaction(trx => {
        let trxQuery = trx.executeSql(
           query
        ,[values],(data)=> console.log('we made it',data),(err)=>console.log('We have encounter an Error', err))
        console.log(trxQuery); // retruns undefined
    })
}

这就是我所谓的函数

    const personObj = JSON.parse(personDetails);
        Object.keys(personObj).map(i => 
            insert('users','name, address, hash', [personObj[i].name, personObj[i].address, personObj[i].hash])
        )

我希望获得we made it的控制台日志以及有关我们插入的数据的信息。感谢您的协助

Answer 1

成功和错误回调具有2个参数，第一个是事务本身，第二个是错误或结果集。您应该像下面那样编辑代码并检查结果集对象，

`export const insert = (tbl, fields, values) =>{
    const query = "insert into ${tbl} (${fields}) values (${values});";
    console.log(query);
    //it looks fine to me
    db.transaction(trx => {
        let trxQuery = trx.executeSql(
             query
            ,[values]
            ,(transact,resultset) => console.log('we made it',resultset)
            ,(transact,err) => console.log('We have encounter an Error', err)
       );
    })
}`

如何使用通用函数将数据插入sqlite数据库

1 个答案: