我已经调整了此代码以尝试在WebSQL数据库中创建多个列。它似乎创建了表，但在被告知时不会插入。我从代码中更改的是要创建和插入的数字或列（我认为）。任何人都可以帮我诊断为什么它不会插入
<script>
//Test for browser compatibility
if (window.openDatabase) {
//Create the database the parameters are 1. the database name 2.version number 3. a description 4. the size of the database (in bytes) 1024 x 1024 = 1MB
var mydb = openDatabase("cars_db", "0.1", "A Database of Cars I Like", 1024 * 1024);
//create the cars table using SQL for the database using a transaction
mydb.transaction(function (t) {
t.executeSql("CREATE TABLE IF NOT EXISTS cars (id INTEGER PRIMARY KEY ASC, item1 TEXT, chair TEXT, table TEXT)");
});
} else {
alert("WebSQL is not supported by your browser!");
}
//function to output the list of cars in the database
function updateCarList(transaction, results) {
//initialise the listitems variable
var listitems = "";
//get the car list holder ul
var listholder = document.getElementById("receipt");
//clear cars list ul
listholder.innerHTML = "";
var i;
//Iterate through the results
for (i = 0; i < results.rows.length; i++) {
//Get the current row
var row = results.rows.item(i);
listholder.innerHTML += "<li>" + row.item1 + " - " + row.chair + " (<a href='javascript:void(0);' onclick='deleteCar(" + row.id + ");'>Delete Car</a>)";
}
}
//function to get the list of cars from the database
function outputCars() {
//check to ensure the mydb object has been created
if (mydb) {
//Get all the cars from the database with a select statement, set outputCarList as the callback function for the executeSql command
mydb.transaction(function (t) {
t.executeSql("SELECT * FROM cars", [], updateCarList);
});
} else {
alert("db not found, your browser does not support web sql!");
}
}
//function to add the car to the database
function addCar() {
//check to ensure the mydb object has been created
if (mydb) {
//get the values of the make and model text inputs
var item1 = "hamburger";
var chair = "cheese";
var table = "123";
//Test to ensure that the user has entered both a make and model
if (item1 !== "" && chair !== "") {
//Insert the user entered details into the cars table, note the use of the ? placeholder, these will replaced by the data passed in as an array as the second parameter
mydb.transaction(function (t) {
t.executeSql("INSERT INTO cars (item1, chair, table) VALUES (?,?,?)", [item1, chair, table]);
outputCars();
});
} else {
alert("You must enter a make and model!");
}
} else {
alert("db not found, your browser does not support web sql!");
}
}
//function to remove a car from the database, passed the row id as it's only parameter
function deleteCar(id) {
//check to ensure the mydb object has been created
if (mydb) {
//Get all the cars from the database with a select statement, set outputCarList as the callback function for the executeSql command
mydb.transaction(function (t) {
t.executeSql("DELETE FROM cars WHERE id=?", [id], outputCars);
});
} else {
alert("db not found, your browser does not support web sql!");
}
}
outputCars();
</script>
这是我改编自的代码（这个工作正常！）
//Test for browser compatibility
if (window.openDatabase) {
//Create the database the parameters are 1. the database name 2.version number 3. a description 4. the size of the database (in bytes) 1024 x 1024 = 1MB
var mydb = openDatabase("cars_db", "0.1", "A Database of Cars I Like", 1024 * 1024);
//create the cars table using SQL for the database using a transaction
mydb.transaction(function (t) {
t.executeSql("CREATE TABLE IF NOT EXISTS cars (id INTEGER PRIMARY KEY ASC, make TEXT, model TEXT)");
});
} else {
alert("WebSQL is not supported by your browser!");
}
//function to output the list of cars in the database
function updateCarList(transaction, results) {
//initialise the listitems variable
var listitems = "";
//get the car list holder ul
var listholder = document.getElementById("carlist");
//clear cars list ul
listholder.innerHTML = "";
var i;
//Iterate through the results
for (i = 0; i < results.rows.length; i++) {
//Get the current row
var row = results.rows.item(i);
listholder.innerHTML += "<li>" + row.make + " - " + row.model + " (<a href='javascript:void(0);' onclick='deleteCar(" + row.id + ");'>Delete Car</a>)";
}
}
//function to get the list of cars from the database
function outputCars() {
//check to ensure the mydb object has been created
if (mydb) {
//Get all the cars from the database with a select statement, set outputCarList as the callback function for the executeSql command
mydb.transaction(function (t) {
t.executeSql("SELECT * FROM cars", [], updateCarList);
});
} else {
alert("db not found, your browser does not support web sql!");
}
}
//function to add the car to the database
function addCar() {
//check to ensure the mydb object has been created
if (mydb) {
//get the values of the make and model text inputs
var make = document.getElementById("carmake").value;
var model = document.getElementById("carmodel").value;
//Test to ensure that the user has entered both a make and model
if (make !== "" && model !== "") {
//Insert the user entered details into the cars table, note the use of the ? placeholder, these will replaced by the data passed in as an array as the second parameter
mydb.transaction(function (t) {
t.executeSql("INSERT INTO cars (make, model) VALUES (?, ?)", [make, model]);
outputCars();
});
} else {
alert("You must enter a make and model!");
}
} else {
alert("db not found, your browser does not support web sql!");
}
}
//function to remove a car from the database, passed the row id as it's only parameter
function deleteCar(id) {
//check to ensure the mydb object has been created
if (mydb) {
//Get all the cars from the database with a select statement, set outputCarList as the callback function for the executeSql command
mydb.transaction(function (t) {
t.executeSql("DELETE FROM cars WHERE id=?", [id], outputCars);
});
} else {
alert("db not found, your browser does not support web sql!");
}
}
outputCars();
如果我将make / model部分修改为一个特定的值而不是从输入中获取，那么它就可以正常工作......就在我尝试添加更多列之后。