1 #pragma once
2 #include <vector>
3 // 加入ADO支持库,
4 #import "C:\Program Files\Common Files\System\ado\msado15.dll" 5 no_namespace 6 rename ("EOF", "adoEOF")
7
8 template<typename stDBDATA>
9 class CADO
10 {
11 public:
12 CADO();
13 virtual ~CADO();
14 public:
15 static void dump_com_error(_com_error &e);
16 bool Init();
17 bool Start();
18 void Uninit();
19 public:
20 void OnWrite(char* name, int age);
21 void OnRead();
22 void OnDelete();
23 void OnModify();
24 void OnExcute();
25
26 private:
27
28 _ConnectionPtr m_pConnection;
29
30 _CommandPtr m_pCommand;
31 _RecordsetPtr m_pRecordset;
32 _RecordsetPtr m_pRecordset1;
33 char* m_strCommand;
34
35 };
36
37 template<class stDBDATA>
38 CADO<stDBDATA>::CADO()
39 {
40 Init();
41 }
42
43 template<class stDBDATA>
44 CADO<stDBDATA>::~CADO()
45 {
46 Uninit();
47 }
48
49 template<class stDBDATA>
50 void CADO<stDBDATA>::dump_com_error(_com_error &e)
51 {
52 char ErrorStr[MAX_PATH];
53
54 _bstr_t bstrSource(e.Source());
55 _bstr_t bstrDescription(e.Description());
56 sprintf_s(ErrorStr, "\n\tADO Error\n\tCode = %08lx\n\tCode meaning = %s\n\tSource = %s\n\tDescription = %s\n\n",
57 e.Error(), e.ErrorMessage(), (LPCTSTR)bstrSource, (LPCTSTR)bstrDescription);
58 printf(ErrorStr);
59 }
60
61 template<class stDBDATA>
62 bool CADO<stDBDATA>::Init()
63 {
64 // 初始化COM,创建ADO连接等操作
65 int S_Result = OleInitialize(NULL);
66 HRESULT hr = m_pConnection.CreateInstance(__uuidof(Connection));
67 /*HRESULT hr = m_pConnection.CreateInstance("ADODB.Connection");*/
68 if(FAILED(hr))
69 {
70 printf("m_pConnection.CreateInstance调用失败\n");
71 return false;
72 }
73 try
74 {
75 // 打开本地Access库Demo.mdb
76 m_pConnection->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Demo.mdb","","",adModeUnknown);
77 }
78 catch(_com_error& e)
79 {
80 dump_com_error(e);
81 return false;
82 }
83
84 return true;
85 }
86
87 template<class stDBDATA>
88 bool CADO<stDBDATA>::Start()
89 {
90 // 使用ADO创建数据库记录集
91 m_pRecordset.CreateInstance(__uuidof(Recordset));
92 try
93 {
94 m_pRecordset->Open("SELECT * FROM USERTABLE", // 查询User表中所有字段
95 m_pConnection.GetInterfacePtr(), // 获取库接库的IDispatch指针
96 adOpenDynamic,
97 adLockOptimistic,
98 adCmdText);
99 }
100 catch(_com_error& e)
101 {
102 dump_com_error(e);
103 return false;
104 }
105
106 return true;
107 }
108
109 template<class stDBDATA>
110 void CADO<stDBDATA>::Uninit()
111 {
112 // 关闭ADO连接状态
113 if(m_pConnection->State)
114 {
115 m_pConnection->Close();
116 m_pConnection= NULL;
117 }
118
119 if(m_pRecordset->State)
120 {
121 m_pRecordset->Close();
122 m_pRecordset.Release();
123 m_pRecordset = NULL;
124 }
125 }
126
127 template<class stDBDATA>
128 void CADO<stDBDATA>::OnWrite(char* name, int age)
129 {
130 long age_l = age;
131 try
132 {
133 // 写入各字段值
134 m_pRecordset->AddNew();
135 m_pRecordset->PutCollect("Name", LPSTR(name));
136 m_pRecordset->PutCollect("Age", age_l);
137 m_pRecordset->Update();
138 }
139 catch(_com_error& e)
140 {
141 dump_com_error(e);
142 }
143 }
144
145 template<class stDBDATA>
146 void CADO<stDBDATA>::OnRead()
147 {
148 _variant_t var;
149
150 char strName[MAX_PATH];
151 int age;
152
153 try
154 {
155 if(!m_pRecordset->BOF)
156 {
157 m_pRecordset->MoveFirst();
158 }
159 else
160 {
161 printf("表内数据为空\n");
162 return;
163 }
164
165 while(!m_pRecordset->adoEOF)
166 {
167 var = m_pRecordset->GetCollect("Name");
168 if(var.vt != VT_NULL)
169 {
170 strcpy_s(strName, _bstr_t(var));
171 }
172 var = m_pRecordset->GetCollect("Age");
173 if(var.vt != VT_NULL)
174 {
175 age = atol(_bstr_t(var));
176 }
177
178 stDBDATA data(strName, age);
179 data.print();
180
181 m_pRecordset->MoveNext();
182 }
183 }
184 catch(_com_error& e)
185 {
186 dump_com_error(e);
187 }
188 }
189
190 template<class stDBDATA>
191 void CADO<stDBDATA>::OnDelete()
192 {
193 try
194 {
195 m_pRecordset->MovePrevious();
196 // 删除当前行记录
197 m_pRecordset->Delete(adAffectCurrent);
198 m_pRecordset->Update();
199
200 }
201 catch(_com_error& e)
202 {
203 dump_com_error(e);
204 }
205 }
206
207 template<class stDBDATA>
208 void CADO<stDBDATA>::OnModify()
209 {
210 char m_Name[MAX_PATH] = "fffff";
211 long m_Age = 25;
212
213 // 修改当前记录的字段值
214 try
215 {
216 m_pRecordset->PutCollect("Name", _variant_t(m_Name));
217 m_pRecordset->PutCollect("Age", m_Age);
218 m_pRecordset->Update();
219 }
220 catch(_com_error& e)
221 {
222 dump_com_error(e);
223 }
224 }
225
226 template<class stDBDATA>
227 void CADO<stDBDATA>::OnExcute()
228 {
229 _CommandPtr m_pCommand;
230 m_strCommand = "delete from USERTABLE where Name = ‘fffff‘";
231
232 m_pCommand.CreateInstance(__uuidof(Command));
233 m_pCommand->ActiveConnection = m_pConnection; // 将库连接赋于它
234 m_pCommand->CommandText = _bstr_t((LPCTSTR)m_strCommand); // SQL语句
235 try
236 {
237 // 执行SQL语句，返回记录集,此记录不能做插入操作
238 // 故为了不和m_pRecordset相冲突, 放入新定义的m_pRecordset1
239 m_pRecordset1 = m_pCommand->Execute( NULL, NULL, adCmdText);
240 }
241 catch(_com_error& e)
242 {
243 dump_com_error(e);
244 }
245 }
1 #include "ado.h"
2
3 struct stDB
4 {
5 char name[MAX_PATH];
6 int age;
7
8 stDB()
9 {
10
11 }
12
13 stDB(char* _name, int _age)
14 {
15 strcpy_s(name,MAX_PATH, _name);
16 age = _age;
17 }
18
19 void print()
20 {
21 printf("Name:%s------Age:%d\n", name, age);
22 }
23 };
24
25 int main()
26 {
27 CADO<stDB> ado;
28 ado.Start();
29 ado.OnRead();
30 ado.OnWrite("q1", 10);
31 ado.OnModify();
32 ado.OnDelete();
33 ado.OnExcute();
34 ado.OnRead();
35 system("pause");
36 return 0;
37 }
时间： 2024-11-05 22:58:35