请注意以下继承体系中各class的constructors写法： 1 class CPoint 2 { 3 public: 4 CPoint(float x=0.0) 5 :_x(x){} 6 7 float x() {return _x;} 8 void x(float xval){_x=xval
1.命令 pgbench --help pgbench is a benchmarking tool for PostgreSQL. Usage: pgbench [OPTION]... [DBNAME] Initialization options: -i, --initialize invoke
