我在使用android上的phonegap 2.9.0写入多个数据库时遇到了一些麻烦。一切似乎在iOS和波纹模拟器上工作正常但是当我使用我的三星galaxy S3（并且它似乎也是其他Android设备的情况）我得到一个错误，“没有这样的表存在”，当试图写行到表。
我正在解析一个json对象以获取列名，数据库名等，然后发送数据以写入数据库。我正在为每个表创建一个单独的数据库，因为可能会有大量数据写入每个数据库。
通常第一个写入的数据库/表成功，但是后来虽然为连续的“create table”sql语句和“insert”语句调用了成功回调，但当我尝试从db读取时，我得到了错误“没有这样的表存在”Table_CategoryClass“”。在创建表和写行时，所有成功回调都会触发。但是，当需要读取数据库时，似乎除了第一个表之外的所有表都没有创建，并且行插入语句没有写入任何连续的表。
我使用延迟类型进程来控制所有异步函数，但我废弃它并将所有内容放入成功/错误回调中，以便我更容易阅读和关注。
我的代码如下：
var mobile_database = {"Category":[{ "id":"494", "CategoryClassID":"26", "Name":"Bathroom", "ParentCategoryID":"0"}, { "id":"500", "CategoryClassID":"25", "Name":"Bathroom Butler", "ParentCategoryID":"0"}, { "id":"487", "CategoryClassID":"25", "Name":"C&A", "ParentCategoryID":"0"}, { "id":"493", "CategoryClassID":"25", "Name":"Cobra", "ParentCategoryID":"0"}, { "id":"490", "CategoryClassID":"27", "Name":"Commercial", "ParentCategoryID":"0"}, { "id":"489", "CategoryClassID":"27", "Name":"Domestic", "ParentCategoryID":"0"}, { "id":"501", "CategoryClassID":"25", "Name":"Dutton", "ParentCategoryID":"0"}, { "id":"498", "CategoryClassID":"26", "Name":"Fire Equipment", "ParentCategoryID":"0"}, { "id":"507", "CategoryClassID":"25", "Name":"Genebre", "ParentCategoryID":"0"}, { "id":"496", "CategoryClassID":"26", "Name":"Geyser", "ParentCategoryID":"0"}, { "id":"509", "CategoryClassID":"25", "Name":"Gv Di Bella", "ParentCategoryID":"0"}, { "id":"491", "CategoryClassID":"27", "Name":"Industrial", "ParentCategoryID":"0"}, { "id":"504", "CategoryClassID":"25", "Name":"Isca", "ParentCategoryID":"0"}, { "id":"503", "CategoryClassID":"26", "Name":"Kitchen", "ParentCategoryID":"0"}, { "id":"495", "CategoryClassID":"25", "Name":"Kwikot", "ParentCategoryID":"0"}, { "id":"499", "CategoryClassID":"25", "Name":"Libra", "ParentCategoryID":"0"}, { "id":"502", "CategoryClassID":"25", "Name":"Plexicor", "ParentCategoryID":"0"}, { "id":"492", "CategoryClassID":"25", "Name":"Rak", "ParentCategoryID":"0"}, { "id":"497", "CategoryClassID":"25", "Name":"Safequip", "ParentCategoryID":"0"}, { "id":"506", "CategoryClassID":"25", "Name":"Salvatore", "ParentCategoryID":"0"}, { "id":"505", "CategoryClassID":"26", "Name":"Shower", "ParentCategoryID":"0"}, { "id":"488", "CategoryClassID":"26", "Name":"Toilet", "ParentCategoryID":"0"}, { "id":"508", "CategoryClassID":"25", "Name":"Vaal", "ParentCategoryID":"0"}], "CategoryClass":[{ "id":"25", "Color":"lightblue", "Name":"Brand"}, { "id":"27", "Color":"lightblue", "Name":"Category"}, { "id":"26", "Color":"lightblue", "Name":"Room/Area"}]};
function get_some_element3(){
$("#loading").html("Setting up database");
var mobile_data = mobile_database;//global variable containing sample data to populate db
var column_names = get_column_names(mobile_data);//returns a json obj with array of column names "tablename": "[columns]"
var sql_columns_obj = create_sql_columns(column_names);// returns a json obj containing {"table_name":{sql_table:"(etc...)", sql_column:"(etc...)"}, "table2":{...}}
var create_table_array = [];
// function sorting out column names to create tables/open databases etc... seems to be working fine.
$.each(sql_columns_obj, function(k, v){
var element = {};
element["DB_Name"] = "DB_"+k;
element["Other_DB_Name"] = "DB_"+k+"_other";
element["Table_Name"] = "Table_"+k;
element["sql_columns_table"] = v["sql_columns_table"];
element["sql_columns"] = v["sql_columns"];
element["columns"] = column_names[k];
element["data"] = mobile_data[k];
create_table_array.push(element);
});
var table_index = 0;
//create_tables3(create_table_array[table_index]);
create_tables3(create_table_array);
function create_tables3( create_table_array ){
write_to_table_new3( create_table_array );
};
};
var super_index = 0;
//function write_to_table_new( DB_Name, Other_DB_Name, Table_Name, data, Columns, sql_columns, sql_columns_table ){
function write_to_table_new3( create_table_array ){
var DB_Name = create_table_array[super_index]["DB_Name"];
alert("DB_Name: "+DB_Name);
var Other_DB_Name = create_table_array[super_index]["Other_DB_Name"];
var Table_Name = create_table_array[super_index]["Table_Name"];
var data = create_table_array[super_index]["data"];
var Columns = create_table_array[super_index]["columns"];
var sql_columns = create_table_array[super_index]["sql_columns"];
var sql_columns_table = create_table_array[super_index]["sql_columns_table"];
var loading = document.getElementById("loading");
loading.innerHTML="";
//var dfd_write = new jQuery.Deferred();// !!! deferred
var db = null;
var db = window.openDatabase(DB_Name, "1.0", Other_DB_Name, 8000000);// 5MB limit per ?DB?
create_sql_table();
function create_sql_table(){
db.transaction(function(tx){
alert('CREATE TABLE IF NOT EXISTS '+Table_Name+' '+sql_columns_table+'');
tx.executeSql('DROP TABLE IF EXISTS '+Table_Name+'', null, sql_droptable_success, sql_droptable_error);
tx.executeSql( 'CREATE TABLE IF NOT EXISTS '+Table_Name+' '+sql_columns_table+'', null, sql_table_success, sql_table_error );
});
function sql_table_success(){
alert("SQL Table Success");
write_sql_rows();
};
function sql_table_error(tx, err){
alert("SQL Table Error: "+err.message);
};
function sql_droptable_success(){
alert("SQL Table drop Success");
};
function sql_droptable_error(tx, err){
alert("SQL Table drop Error: "+err.message);
};
};
function write_sql_rows(){
var row_index = 0;
write_rows();
function write_rows(){
db.transaction(function(tx){
var VALUES = '(';
var data_value = "";
for ( var j=0; j<Columns.length; j++ ){
var key = Columns[j];
if ( key != 'id' ){
data_value = '"'+data[row_index][key]+'"';
}else {
data_value = data[row_index][key];
};
if ( j == 0 ){
VALUES += data_value;
}else{
VALUES += ', '+data_value;
};
};
VALUES += ')';
tx.executeSql('INSERT OR REPLACE INTO '+Table_Name+' '+sql_columns+' VALUES '+VALUES+'', null, row_success, row_error);
});
function row_success(){
row_index += 1;
if ( row_index < data.length ){
write_rows();
}else{
alert("Done Writing Rows");
//dfd_write.resolve("success-write");
super_index += 1;
if (super_index < create_table_array.length){
write_to_table_new( create_table_array );
}else{
alert("Synced!");
super_index = 0;
$("#loading").hide();
};
};
};
function row_error(tx, err){
alert("SQL Row Error: "+err.message);
//dfd_write.reject("fail-write");
};
};
};
// return dfd_write.promise();
};
function drop_all_tables(){
var db = null;
var db = window.openDatabase("DB_Products", "1.0", "DB_Products_other", 8000000);// 5MB limit per ?DB?
db.transaction(function(tx){
tx.executeSql('DROP TABLE IF EXISTS Table_Products');
});
var db = null;
var db = window.openDatabase("DB_ProductCategory", "1.0", "DB_ProductCategory_other", 8000000);// 5MB limit per ?DB?
db.transaction(function(tx){
tx.executeSql('DROP TABLE IF EXISTS ProductCategory');
});
var db = null;
var db = window.openDatabase("DB_Category", "1.0", "DB_Category_other", 8000000);// 5MB limit per ?DB?
db.transaction(function(tx){
tx.executeSql('DROP TABLE IF EXISTS Table_Category');
});
var db = null;
var db = window.openDatabase("DB_CategoryClass", "1.0", "DB_CategoryClass_other", 8000000);// 5MB limit per ?DB?
db.transaction(function(tx){
tx.executeSql('DROP TABLE IF EXISTS Table_CategoryClass');
});
};
正如我所提到的，这个问题似乎只与android有关。似乎其他一些人也有类似的问题，但那是早期版本的phonegap，而不是2.9.0，例如here。
如果我愿意提供赏金，我将非常感谢任何帮助或建议。
答案 0 :(得分：0)
这个问题真的很老了，但是我喜欢捅它。从单个执行中获取成功回调并将其添加到db.transaction。我有一个类似的问题，在一个事务中有多个执行，其中每个执行都有一个成功的回调，它搞砸了。做出我建议的改变为我解决了问题。我认为它与异步事务有关。
db.transaction(function(tx){
alert('CREATE TABLE IF NOT EXISTS '+Table_Name+' '+sql_columns_table+'');
tx.executeSql('DROP TABLE IF EXISTS '+Table_Name+'', null, null, errorCB);
tx.executeSql( 'CREATE TABLE IF NOT EXISTS '+Table_Name+' '+sql_columns_table+'', null, null, errorCB );
},errorCB,successCB);