源代码如下：
while(FLAG){
for(j=0;j<3;j++)
{
if(j<2)
continue;
strcpy(query,emailaddress[j]);
EXEC SQL PREPARE S1 FROM :query;
EXEC SQL DECLARE c1 CURSOR FOR S1;
EXEC SQL OPEN c1;
for (;;)
{
EXEC SQL WHENEVER NOT FOUND DO break;
EXEC SQL FETCH c1 INTO : email;
for(myi=0;myi<50;myi++)
{
if(email[myi]==' ')
{
email[myi]='\0';
break;
}
}
printf("\n%s\n",email);
}
EXEC SQL CLOSE c1;
}
free(encodedstring);
strcpy(replacedstring,"");
for(day=0;day<24;day++){sleep(3600);}
}
EXEC SQL FREE :news_txt;
EXEC SQL COMMIT WORK RELEASE;
请问：
1、这个for都干了什么？
2、那几行大写的类似于数据库操作的都是什么意思啊？
