数据库操作之简单带参操作

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1. using System;
2. using System.Collections.Generic;
3. using System.ComponentModel;
4. using System.Data;
5. using System.Drawing;
6. using System.Linq;
7. using System.Text;
8. using System.Windows.Forms;
9. using System.Data.SqlClient;
10. using System.IO;
11. namespace xmlTojson
12. {
13. public partial class DBForm : Form
14. {
15. public DBForm()
16. {
17. InitializeComponent();
18. }
19. #region 数据库操作
20. //查询
21. //SELECT [DLLID],[DLLCONTENT],[DLLVERTION],[DLLBACKUPS] FROM [TestDB].[dbo].[My_Table]
22. //更新
23. //go
24. //UPDATE [TestDB].[dbo].[My_Table] SET [DLLBACKUPS]=[DLLCONTENT],[DLLCONTENT]=‘789‘ WHERE [DLLID]=‘20160602‘
25. //插入
26. //go
27. //INSERT INTO [TestDB].[dbo].[My_Table] VALUES(‘20180602‘,‘qqq‘,‘222‘,‘444‘)
28. //删除
29. //go
30. //DELETE FROM [TestDB].[dbo].[My_Table] WHERE [DLLID]=‘20170602‘
31. #endregion
32. private void btnSave_Click(object sender, EventArgs e)
33. {
34. byte[] byteBinary = File.ReadAllBytes(@"E:\Programme\MyWork\WLJTools\xmlTojson\xmlTojson\Lib\3w.dll");
36. //string saveString = Encoding.UTF8.GetString(byteBinary);
37. #region DataBase UPdate
38. //"Data Source=LocalHost;Integrated Security=SSPI;Initial Catalog=Northwind;");
39. string connectstring = "Data Source=PC-20151213LNGQ;Integrated Security=True;Initial Catalog=TestDB";
40. string sqlCommandText = "UPDATE My_Table SET [DLLBACKUPS]=[DLLCONTENT],[DLLCONTENT]=" + "@DLLCONTENT" + " WHERE [DLLID]=‘100310125‘";
41. SqlConnection sqlConn = new SqlConnection(connectstring);
42. sqlConn.Open();
43. SqlCommand sqlCommand = sqlConn.CreateCommand();
44. SqlTransaction transact = sqlConn.BeginTransaction();
45. //创建参数
46. SqlParameter para = new SqlParameter("@DLLCONTENT", SqlDbType.VarBinary, byteBinary.Length, ParameterDirection.Input, true, 0, 0, "DLLCONTENT", DataRowVersion.Default, byteBinary);
47. sqlCommand.Parameters.Add(para);
48. //sqlCommand.Parameters["@DLLCONTENT"] = byteBinary;
49. //sqlCommand.Parameters.Add(
50. sqlCommand.Connection = sqlConn;
51. sqlCommand.CommandText = sqlCommandText;
52. sqlCommand.Transaction = transact;
53. try
54. {
55. int xx = (int)sqlCommand.ExecuteNonQuery();
56. if (xx > 0)
57. {
58. MessageBox.Show("Commit Sucess!", "提示信息：");
59. }
60. //return;
61. //SqlDataReader reader = sqlCommand.ExecuteReader(CommandBehavior.CloseConnection);
62. //if (reader.Read())
63. //{
64. // byte[] result = (byte[])reader.GetValue(1);
65. //}
66. transact.Commit();
67. MessageBox.Show("Commit Sucess!", "提示信息：");
68. }
69. catch (Exception ex)
70. {
71. MessageBox.Show("Commit Exception Type: {0}" + ex.GetType(), "提示信息：");
72. try
73. {
74. transact.Rollback();
75. }
76. catch (Exception ex2)
77. {
78. MessageBox.Show("Rollback Exception Type: {0}" + ex2.GetType(), "提示信息：");
79. }
80. }
81. #endregion
82. }
83. private void btnRead_Click(object sender, EventArgs e)
84. {
85. //"Data Source=LocalHost;Integrated Security=SSPI;Initial Catalog=Northwind;");
86. string connectstring = "Data Source=LocalHost;Integrated Security=SSPI;Initial Catalog=TestDB";
87. string sqlCommandText = "SELECT [DLLID],[DLLCONTENT],[DLLVERTION],[DLLBACKUPS] FROM [TestDB].[dbo].[My_Table] WHERE [DLLID]=‘100310125‘";
88. SqlConnection sqlConn = new SqlConnection(connectstring);
89. sqlConn.Open();
90. SqlCommand sqlCommand = sqlConn.CreateCommand();
91. SqlTransaction transact = sqlConn.BeginTransaction();
92. sqlCommand.CommandText = sqlCommandText;
93. sqlCommand.Transaction = transact;
94. try
95. {
96. SqlDataReader reader = sqlCommand.ExecuteReader(CommandBehavior.CloseConnection);
97. if (reader.Read())
98. {
99. byte[] result = (byte[])reader.GetValue(1);
100. File.WriteAllBytes(@"E:\Programme\MyWork\WLJTools\xmlTojson\xmlTojson\Lib\www.dll", result);
101. }
102. reader.Close();
103. MessageBox.Show("Commit Sucess!", "提示信息：");
104. }
105. catch (Exception ex)
106. {
107. MessageBox.Show("Commit Exception Type: {0}" + ex.GetType(), "提示信息：");
108. }
109. }
111. }
112. }

数据库操作之简单带参操作

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原文地址：http://www.cnblogs.com/1175429393wljblog/p/5558302.html