Pro*C动态SQL使用小例

环境：

WinXPSP2+VC6+Oracle10g

代码：

// 定义符号常数 #define USERNAME "SCOTT" #define PASSWORD "x" #include <stdio.h> // 说明SQLCA和ORACA EXEC SQL INCLUDE SQLCA; EXEC SQL INCLUDE ORACA; // 启用ORACLE通讯区：ORACA=YES，使它能被使用 EXEC ORACLE OPTION (ORACA=YES); // 说明SQL变量 EXEC SQL BEGIN DECLARE SECTION; char* username=USERNAME; char* password=PASSWORD; VARCHAR sqlstmt[80]; int emp_number; VARCHAR emp_name[15]; VARCHAR job[50],job1[50],job2[50]; float salary; EXEC SQL END DECLARE SECTION; main() { EXEC SQL WHENEVER SQLERROR GOTO sqlerror; // 发生错误时，保存SQL语句至ORACA oraca.orastxtf=ORASTFERR; // 登录到ORACLE EXEC SQL CONNECT :username IDENTIFIED BY :password; printf("/nConnect to ORACLE./n"); // 构造动态SQL语句 sqlstmt.len=sprintf(sqlstmt.arr,"INSERT INTO EMP(EMPNO,ENAME,JOB,SAL)VALUES(:V1,:V2,:V3,:V4)"); // 显示SQL语句 puts(sqlstmt.arr); // 用PREPARE语句分析当前的动态INSERT语句，语句名是S EXEC SQL PREPARE S FROM :sqlstmt; // 循环插表 for(;;) { printf("/nEnter employee number:"); scanf("%d",&emp_number); if(emp_number==0)break; printf("/nEnter employee name:"); scanf("%s",&emp_name.arr); emp_name.len=strlen(emp_name.arr); printf("/nEnter employee job:"); scanf("%s",&job.arr); job.len=strlen(job.arr); salary = 0; // With VC6, Missing this line will cause C Run-Time Error R6002. printf("/nEnter salary:"); scanf("%f",&salary); EXEC SQL EXECUTE S USING :emp_number,:emp_name,:job,:salary; } // 提交事务，退出ORACLE EXEC SQL COMMIT RELEASE; printf("/nHave a good day!/n"); exit(0); sqlerror: // 打印错误信息 printf("/n%.*s/n",sqlca.sqlerrm.sqlerrml,sqlca.sqlerrm.sqlerrmc); // 打印出错SQL语句 printf("/n/"%.*s.../"/n",oraca.orastxt.orastxtl,oraca.orastxt.orastxtc); // 打印出错SQL语句所在行号及所在文件名 printf("on line %d of %.*s/n/n",oraca.oraslnr, oraca.orasfnm.orasfnml,oraca.orasfnm.orasfnmc); // 回滚事务，退出ORACLE EXEC SQL WHENEVER SQLERROR CONTINUE; EXEC SQL ROLLBACK RELEASE; exit(1); }