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