White started 5 minutes c # database operations (ii) change search based deletions

The previous section, we are ready to a database file, now let's do a variety of packaged Microsoft Entity Framework,

The method they used based on database CRUD.

Preparation:

Engineering a new console, a section on the copy of the database to the project directory, copy local set to true,

The directory structure is substantially a long way:

Then add a nuget package, using various methods c # provided behind aspects:

Substantially common operation, the check data is a class, a class CRUD

Look at how search data:

            // Query data
            using (var connection = new SQLiteConnection("data source=Student.db"))
            {
                connection.Open();
                var command = new SQLiteCommand("select * from StudentInformation", connection);
                var adapter = new SQLiteDataAdapter(command);
                was dataset = new DataSet ();
                adapter.Fill(dataSet);
                var table = dataSet.Tables[0];
            }

Show results:

The remaining additions and deletions to the principles are the same, are written sql statement, and then execute using the command above ExecuteNonQuery method

Increased data

            // Add data
            using (var connection = new SQLiteConnection("data source=Student.db"))
            {
                connection.Open();
                var command = new SQLiteCommand("insert into StudentInformation " +
                    "values(\"王五\",22,\"陕西省西安市长安区\",\"看书,听音乐\",3)", connection);
                var result = command.ExecuteNonQuery();
            }

效果：

执行前：

执行后：

删除数据

            // 删除数据
            using (var connection = new SQLiteConnection("data source=Student.db"))
            {
                connection.Open();
                var command = new SQLiteCommand("delete from StudentInformation where Id = 2", connection);
                var result = command.ExecuteNonQuery();
            }

效果：

执行前：

执行后：

修改数据

            // 修改数据
            using (var connection = new SQLiteConnection("data source=Student.db"))
            {
                connection.Open();
                var command = new SQLiteCommand("update StudentInformation set Name = '张三New' where Id = 2", 
                    connection);
                var result = command.ExecuteNonQuery();
            }

效果：

执行前：

执行后：

到此为止，我们已经能通过c#提供的方法使用sql语句，对数据库文件进行增删改查了。

White started 5 minutes c # database operations (ii) change search based deletions

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