oracle 什么是专业*c？
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What is pro *c?
提问by suvitha
How is that useful? How can we access data from the database?
这有什么用？我们如何从数据库中访问数据？
回答by paxdiablo
Pro*C is actually a pre-compiler for Oracle database access within C code.
Pro*C 实际上是一个用于在 C 代码中访问 Oracle 数据库的预编译器。
You write your code with statements like:
您使用以下语句编写代码：
int sal;
EXEC SQL SELECT salary INTO :sal FROM employees WHERE name = 'Diablo, Pax';
if (sal < 100000)
printf ("I'm not being paid enough!\n");
intermixing regular C with Pro*C statements (as you can see) and then you run it through the Pro*C compiler.
将常规 C 与 Pro*C 语句混合（如您所见），然后通过 Pro*C 编译器运行它。
What comes out of that is a C program which has the Pro*C statements replaced with the equivalent function calls which will do the same thing.
结果是一个 C 程序，其中 Pro*C 语句被替换为等效的函数调用，这些函数调用将执行相同的操作。
You then run this through a real C compiler and it gives you the executables to be run to perform whatever tasks you want.
然后您通过一个真正的 C 编译器运行它，它为您提供要运行的可执行文件以执行您想要的任何任务。
回答by Raj More
Pro C is Oracle's embedded SQL environment for use within C and C++
Pro C 是 Oracle 的嵌入式 SQL 环境，可在 C 和 C++ 中使用
http://infolab.stanford.edu/~ullman/fcdb/oracle/or-proc.html
http://infolab.stanford.edu/~ullman/fcdb/oracle/or-proc.html
回答by unwind
This web pageintroduces the Proc *C language. It seems to be a dialect of C that makes SQL database access easier. Here's a snippet:
本网页介绍了 Proc *C 语言。它似乎是 C 的一种方言，使 SQL 数据库访问更容易。这是一个片段：
int main() {
int x; char *y; int z;
/* ... */
EXEC SQL INSERT INTO emp(empno, ename, deptno)
VALUES(:x, :y, :z);
