如何使用通用函数将数据插入 sqlite 数据库答案

【问题标题】：How to insert Data into sqlite Database using a generic function如何使用通用函数将数据插入 sqlite 数据库
【发布时间】：2019-08-30 10:06:52
【问题描述】：

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函数，包括表名。但是当我运行该函数时，它只会给出错误而没有此错误消息

    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", }, }

所以我使用 javascript React native 构建它并使用 expo SDK。 Expo 在 SQLite 模块中发布，同样，我正在做的是构建一个可以从代码中的任何位置调用的函数，并将一些数据放入数据库。

   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
    })
}

这就是我调用函数的方式

    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。感谢您的帮助

【问题讨论】：

标签： javascript sqlite react-native expo

【解决方案1】：

成功和错误回调有两个参数，第一个是事务本身，第二个是错误或结果集。您应该像下面这样编辑您的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)
       );
    })
}`

【讨论】：