WinRT/Metro SQLite 数据库连接方法（DBHelper）

SQLite 数据库连接方法

第一步：





第二步





第三步

namespace DBHelper.Base

{

public
class
DBHelperSQLite :
DBHelperBase

{

const
string FilePath =
@"App_Data\Data.dat";

private
static
async
Task<string>
getFile()

{

var file =
await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync(FilePath);

return file.Path;

}

string Path {
get;
set; }

public
string ConnectionString

{

get

{

if (Path
== null || Path ==
string.Empty)

{

Path = Windows.ApplicationModel.Package.Current.InstalledLocation.Path
+ "\\" + FilePath;

}

return
Path;

}

}

#region Linq SQL

public
override
int Insert<T>(T Data)

{

int result
= -1;

using (var
db = new SQLite.SQLiteConnection(ConnectionString))

{

result = db.Insert(Data);

db.Close();

}

return result;

}

public
override
int Update<T>(T Data)

{

int result
= -1;

using (var
db = new SQLite.SQLiteConnection(ConnectionString))

{

db.Update(Data);

db.Close();

}

return result;

}

public
override
int Delete<T>(object
primaryKey)

{

int result
= -1;

using (var
db = new SQLite.SQLiteConnection(ConnectionString))

{

db.Delete<T>(primaryKey);

db.Close();

}

return result;

}

public
override
List<T> Query<T>(string
query, params
object[] args)

{

List<T> result
= null;

using (var
db = new SQLite.SQLiteConnection(ConnectionString))

{

result = db.Query<T>(query, args);

db.Close();

}

return result;

}

#endregion

#region Linq Table

public
int CreateTable<T>()

{

int result
= -1;

using (var
db = new SQLite.SQLiteConnection(ConnectionString))

{

result = db.CreateTable<T>();

db.Close();

}

return result;

}

public
bool ExistTable<T>()
where T :
new()

{

bool result
= false;

using (var
db = new SQLite.SQLiteConnection(ConnectionString))

{

//result = db.Table<T>().;

db.Close();

}

return result;

}

public
int DropTable<T>()

{

int result
= -1;

using (var
db = new SQLite.SQLiteConnection(ConnectionString))

{

result = db.DropTable<T>();

db.Close();

}

return result;

}

#endregion

}

}