init commit

archive/design pattern/bridge.cpp

@@ -0,0 +1,66 @@
+#include <iostream>
+using namespace std;
+
+class DB
+{
+public:
+    virtual string data() = 0;
+};
+
+class File
+{
+protected:
+    DB *db;
+
+public:
+    void setDb(DB *db)
+    {
+        this->db = db;
+    }
+    virtual void print() = 0;
+};
+
+class Mysql : public DB
+{
+public:
+    string data()
+    {
+        return "mysql";
+    };
+};
+
+class Oracle:public DB{
+    public:
+    string data(){
+        return "oracle";
+    }
+};
+
+class Txt : public File
+{
+public:
+    void print()
+    {
+        cout << "从" << this->db->data() << "提取数据转换为TXT格式\n";
+    }
+};
+class Pdf:public File{
+    public:
+    void print()
+    {
+        cout << "从" << this->db->data() << "提取数据转换为PDF格式\n";
+    }
+};
+int main()
+{
+    DB *db = new Mysql();//选择数据库
+    File *file=new Txt();//选择输出格式
+    file->setDb(db);
+    file->print();
+    
+    file=new Pdf();
+    db=new Oracle();
+    file->setDb(db);
+    file->print();
+    return 0;
+}