"无法读取属性'消息'未定义的“;在WebSQL错误回调中

"Cannot read property 'message' of undefined" in WebSQL error callback

本文关键字：错误 回调 WebSQL 消息 quot 读取 属性 未定义      更新时间：2023-09-26

我的代码：

function onSuccess(transaction, resultSet) {
    console.log('Query completed: ' + JSON.stringify(resultSet));
}
function onError(transaction, err) {
    console.log("Error : " + err.message);
}
function createTBinventorymastercatalogue(tx) {
    var query = "";
    query += "CREATE TABLE IF NOT EXISTS INVENTORY_MASTER_CATALOGUE(SysPk_InvtyCat,SysFk_Invty_InvtyCat);";
    tx.executeSql(query, [], onSuccess, onError);
    tx.executeSql("INSERT INTO INVENTORY_MASTER_CATALOGUE(SysPk_InvtyCat, SysFk_Invty_InvtyCat) VALUES (?,?)", ['dummydata-pk', 'dummydata-fk'], onSuccess, onError);
}

这是我的JavaScript控制台中的内容：

查询已完成：｛｝
查询已完成：｛｝
未捕获的类型错误：无法读取未定义的属性"message"

完成了两个查询，所以我想它成功地创建并插入了。当我尝试显示它们时，数据就会显示出来。

但是，它不应该显示{}内部的一些数据吗？

我不知道为什么我得到：

未捕获的类型错误：无法读取未定义的属性"message"

即使数据被插入。上面的2个查询是应用程序启动时唯一运行的查询。

我还有其他查询，但它们只在单击按钮时运行，所以错误不可能是由这些查询引起的。我不知道第三个日志来自哪里，为什么"消息"是未定义的？

MCVE

JavaScript:

var ref = null;

(function () {
    "use strict";
    document.addEventListener( 'deviceready', onDeviceReady.bind( this ), false );
})();
var dbSize = 5 * 1024 * 1024; // 5MB
var db = openDatabase("Todo", "", "Todo manager", dbSize, function () {    console.log('db successfully opened or created');});

db.transaction(createTBinventorymastercatalogue, onSuccess, onError);

function onSuccess(transaction, resultSet) {
    console.log('Query completed: ' + JSON.stringify(resultSet));
}
function onError(transaction, err) {
    console.log("Error : " + err.message);
}

function createTBinventorymastercatalogue(tx)
{
    var query = "";
    query += "CREATE TABLE IF NOT EXISTS INVENTORY_MASTER_CATALOGUE(SysPk_InvtyCat,SysFk_Invty_InvtyCat);";
    tx.executeSql(query, [], onSuccess, onError);
    tx.executeSql("INSERT INTO INVENTORY_MASTER_CATALOGUE(SysPk_InvtyCat, SysFk_Invty_InvtyCat) VALUES (?,?)", ['dummydata-pk', 'dummydata-fk'], onSuccess, onError);
}

function renderinventorymastercatalogue()
{
    alert('rendering');
    db.transaction(function (tx2) {
        tx2.executeSql('SELECT * FROM INVENTORY_MASTER_CATALOGUE', [], showInventoryMasterCatalogueData, onSuccess, onError);
    });
}

function showInventoryMasterCatalogueData(tx,results) {
    var invtritemsstring = '';
   for (var ind = 0; ind < results.rows.length ; ind++)
    {
        invtritemsstring += results.rows.item(ind).SysPk_InvtyCat + '-' + results.rows.item(ind).SysFk_Invty_InvtyCat + '<br/>';
    }
    $('.Data-cont').html(invtritemsstring);
}

$('body').on('click', '#show-invtycatmstr-btn', function () { renderinventorymastercatalogue(); });

function deleteAllFromInventoryMasterCatalogue()
{
    alert('delete from table');
    db.transaction(function (tx3) {
        tx3.executeSql('Delete from INVENTORY_MASTER_CATALOGUE', [], renderinventorymastercatalogue, onError);
    });
}
$('body').on('click', '#deleteallfrominvtycatmstr-btn', function () { deleteAllFromInventoryMasterCatalogue(); });

function insertdata(tx)
{
    var enteredsyspk = $('#syspk-inputtext').val();
    var enteredsysfk = $('#sysfk-inputtext').val();


    db.transaction(function (tx4, enteredsyspk, enteredsysfk)
    {
        alert(enteredsyspk + ' ' + enteredsysfk);
        tx4.executeSql('INSERT INTO INVENTORY_MASTER_CATALOGUE(SysPk_InvtyCat, SysFk_Invty_InvtyCat) VALUES (?,?)', ['enteredsyspk', 'enteredsysfk'], renderinventorymastercatalogue, onError);
    });

}

$('body').on('submit', '#syspksysfk-form', function (event)
{
    event.preventDefault();
    insertdata();
});

html:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />

    <meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *">
    <title>BlankCordovaApp3</title>

</head>
<body>
    <div id="content-container">
        <form id="syspksysfk-form">
            <input type="text" name="syspk" id="syspk-inputtext" value="" required/>
            <input type="text" name="sysfk" id="sysfk-inputtext" value="" required />
            <br />
            <input type="submit" value="submit" id="submitform-btn" />
        </form>
                <br />
        <button id="show-invtycatmstr-btn">Show InvtyCatMstr</button>
        <button id="deleteallfrominvtycatmstr-btn">Delete All From InvtyCatMstr</button>

        <div class="Data-cont"></div>
    </div>
<script src="scripts/jquery-2.1.4.min.js"></script>
<!-- Cordova reference, this is added to your app when it's built. -->
<script src="cordova.js"></script>
<script src="scripts/platformOverrides.js"></script>
<script src="scripts/index.js"></script>

调用db.transaction():时，成功/错误回调被反转

db.transaction(createTBinventorymastercatalogue, onSuccess, onError);

由于某种原因，该方法首先进行错误回调。

交换它们，一切都很好：

var dbSize = 5 * 1024 * 1024; // 5MB
var db = openDatabase("Todo", "", "Todo manager", dbSize, function() {
  console.log('db successfully opened or created');
});
db.transaction(createTBinventorymastercatalogue, onError, onSuccess);
function onSuccess(transaction, resultSet) {
  console.log('Query completed: ' + JSON.stringify(resultSet));
}
function onError(transaction, err) {
  console.log("Error : " + err.message);
}
function createTBinventorymastercatalogue(tx) {
  var query = "";
  query += "CREATE TABLE IF NOT EXISTS INVENTORY_MASTER_CATALOGUE(SysPk_InvtyCat,SysFk_Invty_InvtyCat);";
  tx.executeSql(query, [], onSuccess, onError);
  tx.executeSql("INSERT INTO INVENTORY_MASTER_CATALOGUE(SysPk_InvtyCat, SysFk_Invty_InvtyCat) VALUES (?,?)", ['dummydata-pk', 'dummydata-fk'], onSuccess, onError);
}

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