做上位机开发,离不开数据库。我曾经做过几个数据库相关的小项目,下面就总结三种常用的数据库操作的方法。
以下是我在VS2008上写的一个类,里边有三种方法比较典型。
源代码如下:
- using System;
- using System.Collections.Generic;
- using System.Text;
- using System.Data;
- using System.Data.SqlClient;
- namespace DatabaseOperate
- {
- class SqlOperateInfo
- {
- //Suppose your ServerName is "aa",DatabaseName is "bb",UserName is "cc", Password is "dd"
- private string sqlConnectionCommand = "Data Source=aa;Initial Catalog=bb;User ID=cc;Pwd=dd";
- //This table contains two columns:KeywordID int not null,KeywordName varchar(100) not null
- private string dataTableName = "Basic_Keyword_Test";
- private string storedProcedureName = "Sp_InertToBasic_Keyword_Test";
- private string sqlSelectCommand = "Select KeywordID, KeywordName From Basic_Keyword_Test";
- //sqlUpdateCommand could contain "insert" , "delete" , "update" operate
- private string sqlUpdateCommand = "Delete From Basic_Keyword_Test Where KeywordID = 1";
- public void UseSqlReader()
- {
- SqlConnection sqlConnection = new SqlConnection(sqlConnectionCommand);
- SqlCommand sqlCommand = new SqlCommand();
- sqlCommand.CommandType = System.Data.CommandType.Text;
- sqlCommand.Connection = sqlConnection;
- sqlCommand.CommandText = sqlSelectCommand;
- sqlConnection.Open();
- SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();
- while(sqlDataReader.Read())
- {
- //Get KeywordID and KeywordName , You can do anything you like. Here I just output them.
- int keywordid = (int)sqlDataReader[0];
- //the same as: int keywordid = (int)sqlDataReader["KeywordID"]
- string keywordName = (string)sqlDataReader[1];
- //the same as: string keywordName = (int)sqlDataReader["KeywordName"]
- Console.WriteLine("KeywordID = " + keywordid + " , KeywordName = " + keywordName);
- }
- sqlDataReader.Close();
- sqlCommand.Dispose();
- sqlConnection.Close();
- }
- public void UseSqlStoredProcedure()
- {
- SqlConnection sqlConnection = new SqlConnection(sqlConnectionCommand);
- SqlCommand sqlCommand = new SqlCommand();
- sqlCommand.CommandType = CommandType.StoredProcedure;
- sqlCommand.Connection = sqlConnection;
- sqlCommand.CommandText = storedProcedureName;
- sqlConnection.Open();
- sqlCommand.ExecuteNonQuery();
- //you can use reader here,too.as long as you modify the sp and let it like select * from ....
- sqlCommand.Dispose();
- sqlConnection.Close();
- }
- public void UseSqlDataSet()
- {
- SqlConnection sqlConnection = new SqlConnection(sqlConnectionCommand);
- SqlCommand sqlCommand = new SqlCommand();
- sqlCommand.CommandType = System.Data.CommandType.Text;
- sqlCommand.Connection = sqlConnection;
- sqlCommand.CommandText = sqlSelectCommand;
- sqlConnection.Open();
- SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();
- sqlDataAdapter.SelectCommand = sqlCommand;
- DataSet dataSet = new DataSet();
- //sqlCommandBuilder is for update the dataset to database
- SqlCommandBuilder sqlCommandBuilder = new SqlCommandBuilder(sqlDataAdapter);
- sqlDataAdapter.Fill(dataSet, dataTableName);
- //Do something to dataset then you can update it to Database.Here I just add a row
- DataRow row = dataSet.Tables[0].NewRow();
- row[0] = 10000;
- row[1] = "new row";
- dataSet.Tables[0].Rows.Add(row);
- sqlDataAdapter.Update(dataSet, dataTableName);
- sqlCommand.Dispose();
- sqlDataAdapter.Dispose();
- sqlConnection.Close();
- }
- }
- }
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