概括ADO.NET數據庫連接的所有形式(基礎）

　可能大家進來會噴筆者，這么基礎的知識還放在首頁。那么筆者就要問問大家了，你可能熟悉其中部分數據庫讀取的形式，但是熟悉全部的估計很少，或者你完全忘記了，因為這些形式被封裝到你自己框架的底層，自己搞過一兩次就在也沒有動手寫過了。但是筆者覺得這部分知識是應該牢固掌握的，這個是基礎。好如果是已經掌握的大俠，看看筆者寫的內容，提出點建議或者補充筆者的內容。

　　好了廢話不多說看

　　第一種

　　通過直接在cs文件中編寫查詢語句調用?dbcom.ExecuteNonQuery();執行插入數據

1 //連接字符串
2 string ConnectionString = ConfigurationManager.ConnectionStrings["db_Test01ConnectionString"].ConnectionString;
3 string ProviderName = ConfigurationManager.ConnectionStrings["db_Test01ConnectionString"].ProviderName;
4 DbProviderFactory dbproviderfactory = DbProviderFactories.GetFactory(ProviderName);
5 DbConnection dbcon = dbproviderfactory.CreateConnection();
6 dbcon.ConnectionString = ConnectionString;
7 DbCommand dbcom = dbproviderfactory.CreateCommand();
8 dbcom.Connection = dbcon;
9 dbcom.CommandText ="Insert into dt_Table01(name,psw) values(@name,@psw)";
10 dbcom.CommandType = CommandType.Text;
11
12 //添加參數
13 DbParameter dbparameter = dbproviderfactory.CreateParameter();
14 dbparameter.ParameterName ="@name";
15 dbparameter.DbType = DbType.String;
16 dbparameter.Value ="xiaolong";
17 dbcom.Parameters.Add(dbparameter);
18 dbparameter = dbproviderfactory.CreateParameter();
19 dbparameter.ParameterName ="@psw";
20 dbparameter.DbType = DbType.String;
21 dbparameter.Value ="123";
22 dbcom.Parameters.Add(dbparameter);
23 dbcon.Open();
24 try
25 {
26 dbcom.ExecuteNonQuery();
27 }
28 catch(Exception ex)
29 {
30 //將錯誤寫入日志里
31 AddLogError(ex.ToString());
32 Response.Redirect("~/ErrorPage.aspx");
33 }
34 finally
35 {
36 dbcon.Close();
37 }

?

?

　　第二種當然是調用存儲過程

1 //存儲過程的
2 string ConnectionString = ConfigurationManager.ConnectionStrings["db_Test01ConnectionString"].ConnectionString;
3 string ProviderName = ConfigurationManager.ConnectionStrings["db_Test01ConnectionString"].ProviderName;
4 DbProviderFactory dbproviderfactory = DbProviderFactories.GetFactory(ProviderName);
5 DbConnection dbcon = dbproviderfactory.CreateConnection();
6 dbcon.ConnectionString = ConnectionString;
7 DbCommand dbcom = dbproviderfactory.CreateCommand();
8 dbcom.Connection = dbcon;
9 dbcom.CommandType = CommandType.StoredProcedure;
10 dbcom.CommandText ="InsertTable01";
11 DbParameter dbparameter = dbproviderfactory.CreateParameter();
12 dbparameter.DbType = DbType.String;
13 dbparameter.ParameterName ="@name";
14 dbparameter.Value ="xiaohe";
15 dbcom.Parameters.Add(dbparameter);
16 dbparameter = dbproviderfactory.CreateParameter();
17 dbparameter.ParameterName ="@psw";
18 dbparameter.DbType = DbType.String;
19 dbparameter.Value ="123";
20 dbcom.Parameters.Add(dbparameter);
21 dbcon.Open();
22 try
23 {
24 dbcom.ExecuteNonQuery();
25 }
26 catch (Exception ex)
27 {
28 AddLogError(ex.ToString());
29 Response.Redirect("~/ErrorPage.aspx");
30 }
31 finally
32 {
33 dbcon.Close();
34 }

?

?第三種就是可能同時插入兩張表或者三張表或者更多。必須是同時，運用到了事務回滾機制。存儲過程寫法就不給出來了和上面一樣。只是在存儲過程編寫事務。

1 //同時插入兩張的表
2 string ConnectionString = ConfigurationManager.ConnectionStrings["db_Test01ConnectionString"].ConnectionString;
3 string ProviderName = ConfigurationManager.ConnectionStrings["db_Test01ConnectionString"].ProviderName;
4 DbProviderFactory dbproviderfactory = DbProviderFactories.GetFactory(ProviderName);
5 DbConnection dbcon = dbproviderfactory.CreateConnection();
6 dbcon.ConnectionString = ConnectionString;
7 DbCommand dbcom = dbproviderfactory.CreateCommand();
8 dbcom.Connection = dbcon;
9 dbcom.CommandType = CommandType.Text;
10
11 DbParameter dbparameter = dbproviderfactory.CreateParameter();
12 dbparameter.DbType = DbType.String;
13 dbparameter.ParameterName ="@name";
14 dbparameter.Value ="xiaohei";
15 dbcom.Parameters.Add(dbparameter);
16 dbparameter = dbproviderfactory.CreateParameter();
17 dbparameter.ParameterName ="@psw";
18 dbparameter.DbType = DbType.String;
19 dbparameter.Value ="123";
20 dbcom.Parameters.Add(dbparameter);
21 dbparameter = dbproviderfactory.CreateParameter();
22 dbparameter.DbType = DbType.String;
23 dbparameter.ParameterName ="@teacher";
24 dbparameter.Value ="heihei";
25 dbcom.Parameters.Add(dbparameter);
26
27 dbcon.Open();
28 //事務開始
29 DbTransaction dbtran = dbcon.BeginTransaction();
30 dbcom.Transaction = dbtran;
31
32 try
33 {
34 dbcom.CommandText ="insert into dt_table01(name,psw) values(@name,@psw)";
35 dbcom.ExecuteNonQuery();
36 dbcom.CommandText ="insert into dt_table03(teacher,psw) values(@teacher,@psw)";
37 dbcom.ExecuteNonQuery();
38 //成功就提交
39 dbtran.Commit();
40 }
41 catch (Exception ex)
42 {
43 //出錯就回滾
44 dbtran.Rollback();
45 AddLogError(ex.ToString());
46 Response.Redirect("~/ErrorPage.aspx");
47 }
48 finally
49 {
50 dbcon.Close();
51 dbtran.Dispose();
52 }

第四種

通過使用DbDataAdapter來獲得查詢的結果

1 //查詢數據庫
2 string ConnectionString = ConfigurationManager.ConnectionStrings["db_Test01ConnectionString"].ConnectionString;
3 string ProviderName = ConfigurationManager.ConnectionStrings["db_Test01ConnectionString"].ProviderName;
4 DbProviderFactory dbproviderfactory = DbProviderFactories.GetFactory(ProviderName);
5 DbConnection dbcon = dbproviderfactory.CreateConnection();
6 dbcon.ConnectionString = ConnectionString;
7 DbCommand dbcom = dbproviderfactory.CreateCommand();
8 dbcom.Connection = dbcon;
9 dbcom.CommandText ="Select * from dt_Table01 where name=@name";
10 dbcom.CommandType = CommandType.Text;
11 DbParameter dbparameter = dbproviderfactory.CreateParameter();
12 dbparameter.ParameterName ="@name";
13 dbparameter.DbType = DbType.String;
14 dbparameter.Value ="xiaolong";
15 dbcom.Parameters.Add(dbparameter);
16 DataSet ds =new DataSet();
17 DbDataAdapter dbDataAdapeter = dbproviderfactory.CreateDataAdapter();
18 dbDataAdapeter.SelectCommand = dbcom;
19 try
20 {
21 dbDataAdapeter.Fill(ds, "data");
22 }
23 catch (Exception ex)
24 {
25 AddLogError(ex.ToString());
26 Response.Redirect("~/ErrorPage.aspx");
27 }
28 finally
29 {
30 dbDataAdapeter.Dispose();
31 }

第5種

使用DbDataReader或者查詢結果，這里給出查詢第一行第一列值，當然也可以直接調用Command.ExecuteScalar();函數

1 string ConnectionString = ConfigurationManager.ConnectionStrings["db_Test01ConnectionString"].ConnectionString;
2 string ProviderName = ConfigurationManager.ConnectionStrings["db_Test01ConnectionString"].ProviderName;
3 DbProviderFactory dbproviderfactory = DbProviderFactories.GetFactory(ProviderName);
4 DbConnection dbcon = dbproviderfactory.CreateConnection();
5 dbcon.ConnectionString = ConnectionString;
6 DbCommand dbcom = dbproviderfactory.CreateCommand();
7 dbcom.Connection = dbcon;
8 dbcom.CommandText ="Select * from dt_Table01 where name=@name";
9 dbcom.CommandType = CommandType.Text;
10 DbParameter dbparameter = dbproviderfactory.CreateParameter();
11 dbparameter.ParameterName ="@name";
12 dbparameter.DbType = DbType.String;
13 dbparameter.Value ="xiaolong";
14 dbcom.Parameters.Add(dbparameter);
15 dbcon.Open();
16 DbDataReader dbDataReader=null;
17 string re =string.Empty;
18 try
19 {
20 dbDataReader= dbcom.ExecuteReader(CommandBehavior.SingleRow);
21 }
22 catch (Exception ex)
23 {
24 AddLogError(ex.ToString());
25 Response.Redirect("~/ErrorPage.aspx");
26 }
27 finally
28 {
29 dbcon.Close();
30 dbDataReader.Close();
31 }
32 //讀入值
33 if (dbDataReader.Read())
34 {
35 //得到第一列值
36 re = dbDataReader.GetValue(0).ToString();
37 }
38 re = re +"hah";

當然還可以自己編寫一些常用的調用例如：或者查詢結果第一列的值等等。

大致上就是以上這幾種形式了。

存儲過程，Command直接執行，DataReader,DataAdapter,事務

由于筆者知識有限，如果還有其他形式請您補充上來

轉載于:https://www.cnblogs.com/blogbai/archive/2012/09/26/2703881.html

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