嘿大家我一直致力于一个项目,使用phonegap / jQuery / html5拍照并将它们存储在数据库中。数据库条目需要存储一些地理位置信息和摄像机拍摄的图像的BLOB。这是我用来尝试这样做的当前方法,它不适合我。 BLOB总是打破我的插入语句。如果我将smallImage设置为“1”而不是图像数据,它可以正常工作。有没有更好的方法来插入这个blob?当我查看日志时,看起来像smallImage被切断了。
var cameraLat;
var cameraLong;
var cameraTimestamp;
var destinationType;
var cameraLocationID;
function onGeoSuccess(position) {
cameraLat = position.coords.latitude;
console.log(cameraLat);
cameraLong = position.coords.longitude;
console.log(cameraLong);
cameraTimestamp = position.timestamp;
console.log(cameraTimestamp);
}
function geoFail(position) {
alert('code: ' + error.code + '\n' +
'message: ' + error.message + '\n');
}
function onPhotoDataSuccess(imageData) {
// Get image handle
navigator.geolocation.getCurrentPosition(onGeoSuccess, geoFail);
var smallImage = imageData;
var Latitude = cameraLat;
var longitude = cameraLong;
var timestamp = cameraTimestamp;
var LID = cameraLocationID;
console.log(Latitude); //working
console.log(longitude); //working
console.log(timestamp); //working
console.log(smallImage); // This cuts out and breaks my insert.
var db = window.openDatabase("MobilePhotos", "1.0", "MobilePhotosData", 1000000);
db.transaction(function (tx) {tx.executeSql('INSERT INTO Photos(PhotoID, PictureFile, Longitude, Latitude, Timestamp ) VALUES( '+ timestamp+LID+' ,' + smallImage + '", ' + longitude +', '+ Latitude +', "'+ timestamp +'")')})
}
function take_pic(LocationID) {
cameraLocationID=LocationID;
navigator.camera.getPicture(onPhotoDataSuccess, function(ex) {alert("Camera Error!");}, { quality : 50, destinationType: Camera.DestinationType.DATA_URL });
}
以下是我尝试输入BLOB时出现的错误:
02-05 16:10:19.702: W/System.err(12028):
android.database.sqlite.SQLiteException:
no such column: undefined (code 1): , while compiling:
INSERT INTO OrderPhotos(PhotoID, PictureFile, Longitude, Latitude, Timestamp )
VALUES( 1904010821 , "/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDABsS..(3825 characters)
但是我没有看到其余的领域。有什么东西可以打破双引号吗?或者是其他事情发生在这里?
如果我在smallImage中输入“1”,我的输出就可以了:
INSERT INTO OrderPhotos(PhotoID, PictureFile, Longitude, Latitude, Timestamp )
VALUES( 1904010821 , "1", 39.10, -84.50, 190401082)
答案 0 :(得分:3)
您尝试使用运算符?
:
db.transaction(function(tx) {
tx.executeSql("INSERT INTO OrderPhotos(PhotoID, PictureFile, Longitude,
Latitude, Timestamp ) VALUES
( 1904010821 , ? , 39.10, -84.50, 190401082)",
[PictureFile],
function(tx, res) {
....
});
});
运算符?
,优于使用字符串连接。
用你的例子:
db.transaction(function (tx)
{tx.executeSql('INSERT INTO Photos(PhotoID, PictureFile, Longitude, Latitude, Timestamp )
VALUES( ?,?,?,?,?)')},[photoid, small photo, longitud, latitude, timestamp])}
每个?
对应于相同顺序的每个var。