Sqlite-无法返回所选数据angularjs服务

在我的爱奥尼亚应用程序中。我创建了一个名为webservice的服务，使用angularjs从sqlite数据库检索数据。它正确选择数据并在控制台中获得结果，工作正常，但总是返回未定义的

这是我的示例代码：

app.factory('webservice',function($http,$cordovaSQLite,$q){

    var obj = {};

    obj.getNote =  function(){
        var query = "SELECT subject, note FROM notes";
        var q = $q.defer();
        $cordovaSQLite.execute(db, query).then(function(res) {
            if(res.rows.length > 0) {               
                var data = res.rows;
                console.log(data); //Result - Working..
                q.resolve(res.rows); //Result - Undefined..
                return data; //Result - Undefined..
            } else {
                console.log("No results found");
                return false;
            }
        }, function (err) {
            console.error(err);
        });
    }

    return obj;

});

app.controller('noteCtrl', function($scope,$state,webservice){

    $scope.getNote =  function(){
        console.log(webservice.getNote()); // Undefined.
    }

});

这是我的控制器：

app.factory('webservice',function($http,$cordovaSQLite,$q){

    var obj = {};

    obj.getNote =  function(){
        var query = "SELECT subject, note FROM notes";
        var q = $q.defer();
        $cordovaSQLite.execute(db, query).then(function(res) {
            if(res.rows.length > 0) {               
                var data = res.rows;
                console.log(data); //Result - Working..
                q.resolve(res.rows); //Result - Undefined..
                return data; //Result - Undefined..
            } else {
                console.log("No results found");
                return false;
            }
        }, function (err) {
            console.error(err);
        });
    }

    return obj;

});

app.controller('noteCtrl', function($scope,$state,webservice){

    $scope.getNote =  function(){
        console.log(webservice.getNote()); // Undefined.
    }

});

所以请尝试为我找到好的解决方案

---

谢谢大家!

两件事。首先，您没有从服务返回承诺对象，其次，您没有在控制器中调用then函数。请尝试以下代码：

app.factory('webservice',function($http,$cordovaSQLite,$q){

    var obj = {};

    obj.getNote =  function(){
        var query = "SELECT subject, note FROM notes";
        var q = $q.defer(); //this is your deferred object
        $cordovaSQLite.execute(db, query).then(function(res) {
            if(res.rows.length > 0) {               
                var data = res.rows;
                console.log(data); //Result - Working..
                q.resolve(res.rows); //Result - Undefined..
                return data; //Result - Undefined..
            } else {
                console.log("No results found");
                q.reject("No results found"); 
                return false;
            }
        }, function (err) {
            q.reject(err);
            console.error(err);
        });

        return q.promise;       //This line was missing

    }

    return obj;

});

在控制器中，执行以下操作：

 app.controller('noteCtrl', function($scope,$state,webservice){

    $scope.getNote =  function(){
        webservice.getNote().then(
            function(res){   //success callback
             console.log(res);  //this should be the resolved object
            },
            function(err){   //error callback
             console.log(err);  //this should be the rejected object
            });
    }

});

---

两件事。首先，您没有从服务返回承诺对象，其次，您没有在控制器中调用then函数。请尝试以下代码：

app.factory('webservice',function($http,$cordovaSQLite,$q){

    var obj = {};

    obj.getNote =  function(){
        var query = "SELECT subject, note FROM notes";
        var q = $q.defer(); //this is your deferred object
        $cordovaSQLite.execute(db, query).then(function(res) {
            if(res.rows.length > 0) {               
                var data = res.rows;
                console.log(data); //Result - Working..
                q.resolve(res.rows); //Result - Undefined..
                return data; //Result - Undefined..
            } else {
                console.log("No results found");
                q.reject("No results found"); 
                return false;
            }
        }, function (err) {
            q.reject(err);
            console.error(err);
        });

        return q.promise;       //This line was missing

    }

    return obj;

});

在控制器中，执行以下操作：

 app.controller('noteCtrl', function($scope,$state,webservice){

    $scope.getNote =  function(){
        webservice.getNote().then(
            function(res){   //success callback
             console.log(res);  //this should be the resolved object
            },
            function(err){   //error callback
             console.log(err);  //this should be the rejected object
            });
    }

});

---

谢谢，它很有效。但是当我在视图中使用ng repeat时，我得到了以下错误

[$rootScope:infdig]10$digest（）迭代。流产您能告诉我如何修复此问题吗？谢谢，它可以正常工作。但是当我在视图中使用ng repeat时，我得到了以下错误
[$rootScope:infdig]10$digest（）迭代。流产