C# SqliteDataAdapter.Dispose方法代码示例

        public static DataTable GetDataTable(string query)
        {
            DataSet tempDataSet = new DataSet();
            SqliteDataAdapter tempAdapter = null;

            try
            {
                __connection.Open();
                tempAdapter = new SqliteDataAdapter(query, __connection);
                tempDataSet.Reset();
                tempAdapter.Fill(tempDataSet);

            }
            catch (Exception ex)
            {
                throw new InvalidOperationException("Error in the DataBase", ex);
            }
            finally
            {
                if (tempAdapter != null)
                    tempAdapter.Dispose();

                __connection.Close();
            }

            return tempDataSet.Tables[0];
        }

		/// <summary>  
		/// 查询数据集  
		/// </summary>  
		/// <param name="cmd">SQLiteCommand对象</param>  
		/// <returns>返回数据集</returns>  
		public static DataSet ExecuteDataSet (SqliteCommand cmd)
		{  
			if (cmd.Connection.State == ConnectionState.Closed)
				cmd.Connection.Open ();  
			DataSet ds = new DataSet ();  
			SqliteDataAdapter da = new SqliteDataAdapter (cmd);  
			da.Fill (ds);  
			da.Dispose ();  
			cmd.Connection.Close ();  
			cmd.Dispose ();  
			return ds;  
		}

//.........这里部分代码省略.........

			dbcmd.CommandText =
				"INSERT INTO MONO_TEST  " +
				"(NID, NDESC, NTIME) " +
				"VALUES(:NID,:NDESC,:NTIME)";
			dbcmd.Parameters.Add( new SqliteParameter("NID", 2) );
			dbcmd.Parameters.Add( new SqliteParameter(":NDESC", "Two (unicode test: \u05D1)") );
			dbcmd.Parameters.Add( new SqliteParameter(":NTIME", DateTime.Now) );
			Console.WriteLine("Insert modified rows with parameters = 1, 2: " + dbcmd.ExecuteNonQuery() + " , " + dbcmd.LastInsertRowID());

			dbcmd.CommandText =
				"INSERT INTO MONO_TEST  " +
				"(NID, NDESC, NTIME) " +
				"VALUES(3,'Three, quoted parameter test, and next is null; :NTIME', NULL)";
			Console.WriteLine("Insert with null modified rows and ID = 1, 3: " + dbcmd.ExecuteNonQuery() + " , " + dbcmd.LastInsertRowID());

			dbcmd.CommandText =
				"INSERT INTO MONO_TEST  " +
				"(NID, NDESC, NTIME) " +
				"VALUES(4,'Four with ANSI char: ü', NULL)";
			Console.WriteLine("Insert with ANSI char ü = 1, 4: " + dbcmd.ExecuteNonQuery() + " , " + dbcmd.LastInsertRowID());

			dbcmd.CommandText =
				"INSERT INTO MONO_TEST  " +
				"(NID, NDESC, NTIME) " +
				"VALUES(?,?,?)";
			dbcmd.Parameters.Clear();
			IDbDataParameter param1 = dbcmd.CreateParameter();
			param1.DbType = DbType.DateTime;
			param1.Value = 5;
			dbcmd.Parameters.Add(param1);			
			IDbDataParameter param2 = dbcmd.CreateParameter();
			param2.Value = "Using unnamed parameters";
			dbcmd.Parameters.Add(param2);
			IDbDataParameter param3 = dbcmd.CreateParameter();
			param3.DbType = DbType.DateTime;
			param3.Value = DateTime.Parse("2006-05-11 11:45:00");
			dbcmd.Parameters.Add(param3);
			Console.WriteLine("Insert with unnamed parameters = 1, 5: " + dbcmd.ExecuteNonQuery() + " , " + dbcmd.LastInsertRowID());

			dbcmd.CommandText =
				"SELECT * FROM MONO_TEST";
			SqliteDataReader reader;
			reader = dbcmd.ExecuteReader();

			Console.WriteLine("read and display data...");
			while(reader.Read())
				for (int i = 0; i < reader.FieldCount; i++)
					Console.WriteLine(" Col {0}: {1} (type: {2}, data type: {3})",
						i, reader[i] == null ? "(null)" : reader[i].ToString(), reader[i] == null ? "(null)" : reader[i].GetType().FullName, reader.GetDataTypeName(i));

			dbcmd.CommandText = "SELECT NDESC FROM MONO_TEST WHERE NID=2";
			Console.WriteLine("read and display a scalar = 'Two': " + dbcmd.ExecuteScalar());

			dbcmd.CommandText = "SELECT count(*) FROM MONO_TEST";
			Console.WriteLine("read and display a non-column scalar = 3: " + dbcmd.ExecuteScalar());

			Console.WriteLine("read and display data using DataAdapter/DataSet...");
			SqliteDataAdapter adapter = new SqliteDataAdapter("SELECT * FROM MONO_TEST", connectionString);
			DataSet dataset = new DataSet();
			adapter.Fill(dataset);
			foreach(DataTable myTable in dataset.Tables){
				foreach(DataRow myRow in myTable.Rows){
					foreach (DataColumn myColumn in myTable.Columns){
						Console.WriteLine(" " + myRow[myColumn]);
					}
				}
			}

			/*Console.WriteLine("read and display data using DataAdapter/DataTable...");
			DataTable dt = new DataTable();
			adapter.Fill(dt);
			DataView dv = new DataView(dt);
			foreach (DataRowView myRow in dv) {
				foreach (DataColumn myColumn in myRow.Row.Table.Columns) {
					Console.WriteLine(" " + myRow[myColumn.ColumnName]);
				}
			}*/
       		       		            
			try {
				dbcmd.CommandText = "SELECT NDESC INVALID SYNTAX FROM MONO_TEST WHERE NID=2";
				dbcmd.ExecuteNonQuery();
				Console.WriteLine("Should not reach here.");
			} catch (Exception e) {
				Console.WriteLine("Testing a syntax error: " + e.GetType().Name + ": " + e.Message);
			}

			/*try {
				dbcmd.CommandText = "SELECT 0/0 FROM MONO_TEST WHERE NID=2";
				Console.WriteLine("Should not reach here: " + dbcmd.ExecuteScalar());
			} catch (Exception e) {
				Console.WriteLine("Testing an execution error: " + e.GetType().Name + ": " + e.Message);
			}*/

			dataset.Dispose();
			adapter.Dispose();
			reader.Close();
			dbcmd.Dispose();
			dbcon.Close();
		}