EXEC SQL BEGIN DECLARE SELTION;
char deptname[20];
char HSno[9];
char HSname[20];
char HSsex[2];
int HSage;
int NEWAGE;
EXEC SQL END DECLARE SECTION;
long SQLCODE;
EXEC SQL INCLUDE sqlca;
int main(void)
{int count=0;
 char yn;
 printf("Please choose the department name(CS/MA/IS):");
 scanf("%s",&deptname);
EXEC SQL CONNECT TO TEST@LOCALHOSR:54321 USER "SYSTEM"/"MANAGER";


我真的不懂啦~~很菜的~~能不能帮我解释一下这句
EXEC SQL CONNECT TO TEST@LOCALHOSR:54321 USER "SYSTEM"/"MANAGER";
谢谢了~~