Database proc Programming Two

#define_crt_secure_no_warnings#include<stdio.h>#include<stdlib.h>#include<string.h>#include"sqlca.h"//connecting to a database/*EXEC SQL CONNECT {: User identified by:oldpswd |: USR_PSW} [[at {dbname |: host_variable}] Using:connect_strin G] [{ALTER authorization:newpswd | in {SYSDBA |        Sysoper} MODE}]; */EXEC SQL BEGIN DECLARE section; Char* serverid="Scott/[email protected]"; Charuser[ +]; Charpasswd[ +]; Charsid[ +]; EXEC SQL END DECLARE section;//User username//passwd Password//SID Database IDvoidMain () {intret=0; //using host variables in the C language//printf ("serverid=%s\r\n", ServerID);printf ("User:"); scanf ("%s", user); printf ("passwd:"); scanf ("%s", passwd); printf ("SID:"); scanf ("%s", sid); //How to connect to a database-- using variables in Embedded SQL programming is added: EXEC SQL Connect:user identified by:p asswd Using:sid; //Connect database Mode two//EXEC SQL Connect:serverid;    if(sqlca.sqlcode!=0) {ret=Sqlca.sqlcode; printf ("Connect err:%d", ret); System ("Pause"); }Else{printf ("Connect ok!\r\n"); //COMMIT Transaction DisconnectEXEC SQL commit release; printf ("Oracle closed!\r\n"); System ("Pause"); }}

#define_crt_secure_no_warnings#include<stdio.h>#include<stdlib.h>#include<string.h>#include"sqlca.h"EXEC SQL BEGIN DECLARE section; Char*user="Scott"; Char*passwd="123456"; Char*sid="ORCL"; Char*linkf="Link1";//assigning names by host variables    Char*linkt="Link2"; EXEC SQL END DECLARE section;//User username//passwd Password//SID Database IDvoidMain () {intret=0; //Connect Database mode three-multiple users connect to multiple databasesEXEC SQL Connect:user identified by:p asswd AT:LINKF Using:sid; if(sqlca.sqlcode!=0) {ret=Sqlca.sqlcode; printf ("Connect1 err:%d", ret); System ("Pause"); }Else{printf ("Connect1 ok!\r\n"); //COMMIT Transaction DisconnectEXEC SQL commit release; printf ("Oracle closed!\r\n"); //System ("pause");} EXEC SQL Connect:user identified by:p asswd At:linkt Using:sid; if(sqlca.sqlcode!=0) {ret=Sqlca.sqlcode; printf ("connect2 err:%d", ret); System ("Pause"); }Else{printf ("Connect2 ok!\r\n"); //COMMIT Transaction DisconnectEXEC SQL commit release; printf ("Oracle closed!\r\n"); //System ("pause");} system ("Pause");}

#define_crt_secure_no_warnings#include<stdio.h>#include<stdlib.h>#include<string.h>#include"sqlca.h"//Here I use a user, in fact, can also be a number of usersEXEC SQL BEGIN DECLARE section; Char*user="Scott"; Char*passwd="123456"; Char*sid="ORCL"; EXEC SQL END DECLARE section;voidMain () {intret=0; //different from the third way, automatically assigned by OracleEXEC SQL DECLARE LINKF DATABASE;    EXEC SQL DECLARE Linkt DATABASE; //Connect to database mode four-- note that LINKF is no longer a host variable and therefore does not need to be added: EXEC SQL Connect:user identified by:p asswd at LINKF Using:sid; if(sqlca.sqlcode!=0) {ret=Sqlca.sqlcode; printf ("Connect1 err:%d", ret); System ("Pause"); }Else{printf ("Connect1 ok!\r\n"); //COMMIT Transaction DisconnectEXEC SQL commit release; printf ("Oracle closed!\r\n"); //System ("pause");} EXEC SQL Connect:user identified by:p asswd at Linkt Using:sid; if(sqlca.sqlcode!=0) {ret=Sqlca.sqlcode; printf ("connect2 err:%d", ret); System ("Pause"); }Else{printf ("Connect2 ok!\r\n"); //COMMIT Transaction DisconnectEXEC SQL commit release; printf ("Oracle closed!\r\n"); //System ("pause");} system ("Pause");}

Database proc Programming Two