如何使用通用函数将数据插入 sqlite 数据库

Posted 2023-02-19

【中文标题】如何使用通用函数将数据插入 sqlite 数据库

【英文标题】：How to insert Data into sqlite Database using a generic function

【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

【参考方案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)
       );
    )
`