PhoneGapBuild - 下载 sqlite db 并连接到它

Question

我的头撞墙有一段时间了，希望蜂巢思维能帮助我。

我正在尝试从远程位置下载并附加一个 sqlite 数据库（'database.db'），虽然我可以很好地下载它，但我正在努力使用 window.sqlitePlugin.openDatabase({ name : databaseName });

有任何想法或有人能够在 phonegapbuild 中下载并附加一个 sqlite 数据库吗？

var _urlContactsSqlite = 'https://www.dropbox.com/s/370lyi2w21pxgrs/database.db?dl=1';



function init() {
        var databaseName = 'database.db';
        window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, 
            function requestFileSystemSuccess(fs) {             //fs = filesystem
                console.log('requestFileSystemSuccess');
                fs.root.getDirectory('databases', { create: true },         //create the directory if it doesnt exist
                    function getDirectorySuccess(dataEntry) {
                        console.log('getDirectorySuccess');
                        fs.root.getFile('dummy.html', {create: true, exclusive: false}, 
                            function getFileSuccess(fileEntry) {
                                console.log('getFileSuccess');
                                var sPath = fileEntry.nativeURL.replace('dummy.html','') + 'databases/';
                                console.log('sPath: ' + sPath);
                                var ft = new FileTransfer();
                                ft.download(
                                    encodeURI(_urlContactsSqlite),
                                    sPath + databaseName, 
                                    function downloadSuccess(entry) {
                                      console.log('downloadSuccess - what now smarty pants');
                                      console.log('now we have the database in a location, we should try and open it.');
                                      $rootScope._db = window.sqlitePlugin.openDatabase({
                                                name : databaseName
                                      });
                                        console.log('attempting to get a count of the contacts table');
                                        var promise = dbQuery.contacts_Count();
                                        promise
                                            .then(function(data) {
                                                console.log(data);
                                                alert(data);    
                                            })
                                            .catch(function(error) {
                                                console.log('error occurred inside promise : ' + error );
                                            });
                                    }, 
                                    function downloadFail(e) {
                                        console.log('downloadFail', e);
                                        console.log('error source ' + e.source);
                                        console.log('error target ' + e.target);
                                        console.log('error code ' + e.code);
                                    }, 
                                  false, null); //end fileTransfer                                  
                            },
                            function getFileFail(e) {
                                console.log('getFileFail',e);
                            }
                        );
                    }, 
                    function getDirectoryFail(e) 
                    {
                        console.log('getDirectoryFail',e);
                    }
                  );        //end requestFileSystem
            },
            function requestFileSystemFail(){
                console.log('requestFileSystemFail');
            }
        );  //end requestFileSystem
    }   // end init()

dbQuery.contacts_Count();

function contacts_Count() {
            var deferred = $q.defer();
            setTimeout(function() {
                    $rootScope._db.transaction(function(tx) {
                            var sql = 'SELECT COUNT(*) AS COUNT FROM contacts;';
                            console.log(sql);
                            tx.executeSql(sql, [], function(tx, results) {
                                    var rowCount = results.rows.item(0).COUNT;
                                    console.log('rowcount: ' + rowCount);
                                    deferred.resolve(rowCount);
                            }, null);
                    });

            },1);
            return deferred.promise;
    }

Answer 1

我猜这是因为 SqlitePlugin 在哪里寻找您的数据库。它显示在您的代码中，您正在将其下载到数据库目录，而插件仅在 www 子目录中查找。根据预填充数据库的documentation：

对于 Android 和 iOS（仅限）：将数据库文件放在 www 目录并打开数据库，如下所示：

var db = window.sqlitePlugin.openDatabase({name: "my.db", createFromLocation: 1});

---- 在下面编辑：

考虑在_db.transaction 函数中添加一些错误检查，如下所示：

$rootScope._db.transaction(function(tx) {
        var sql = 'SELECT COUNT(*) AS COUNT FROM contacts;';
        console.log(sql);
        tx.executeSql(sql, [], function(tx, results) {
                var rowCount = results.rows.item(0).COUNT;
                console.log('rowcount: ' + rowCount);
                deferred.resolve(rowCount);
        }, null);
    },
    function(error) {
        console.log('db error: ' + error.message);
    });