使用OTL操作Oracle数据库

使用OTL操作Oracle数据库

一、编写代码

注：以下代码来自OTL示例

/* 
 * otl_test.cpp 
 * 
 */ 

#include <iostream>
using namespace std;

#include <cstdio>

#define OTL_ORA10G_R2 // Compile OTL 4.0/OCI10gR2
#include <otlv4.h> // include the OTL 4.0 header file
otl_connect db; // connect object

void insert()
// insert rows into table
{
    otl_stream o(50, // buffer size
            "insert into test_tab values(:f1<int>,:f2<char[31]>)",
            // SQL statement
            db // connect object
            );
    o.set_commit(0); // turn off stream's "auto-commit"

    char tmp[32];

    for (int i = 1; i <= 123; ++i) {
        sprintf(tmp, "Name%d", i);
        o << i << tmp;
    }
    o.flush(); // flush the stream's dirty buffer: 
    // execute the INSERT for the rows 
    // that are still in the stream buffer

    db.commit_nowait(); // commit with no wait (new feature of Oracle 10.2)
}

void select() {
    otl_stream i(50, // buffer size
            "select * from test_tab where f1>=:f<int> and f1<=:f*2",
            // SELECT statement
            db // connect object
            );
    // create select stream

    float f1;
    char f2[31];

    i << 8; // assigning :f = 8
    // SELECT automatically executes when all input variables are
    // assigned. First portion of output rows is fetched to the buffer

    while (!i.eof()) { // while not end-of-data
        i >> f1 >> f2;
        cout << "f1=" << f1 << ", f2=" << f2 << endl;
    }

    i << 4; // assigning :f = 4
    // SELECT automatically executes when all input variables are
    // assigned. First portion of output rows is fetched to the buffer

    while (!i.eof()) { // while not end-of-data
        i >> f1 >> f2;
        cout << "f1=" << f1 << ", f2=" << f2 << endl;
    }

}

int main() {
    otl_connect::otl_initialize(); // initialize OCI environment
    try {

        db.rlogon("xuanyuan/xuanyuan"); // connect to Oracle

        otl_cursor::direct_exec(db, "drop table test_tab",
                otl_exception::disabled // disable OTL exceptions
        ); // drop table

        otl_cursor::direct_exec(db,
                "create table test_tab(f1 number, f2 varchar2(30))"); // create table

        insert(); // insert records into table
        select(); // select records from table

    }

    catch (otl_exception& p) { // intercept OTL exceptions
        cerr << p.msg << endl; // print out error message
        cerr << p.stm_text << endl; // print out SQL that caused the error
        cerr << p.var_info << endl; // print out the variable that caused the error
    }

    db.logoff(); // disconnect from Oracle

    return 0;

}

二、编译代码

g++ -o"otl_test" otl_test.cpp -lclntsh -I"$ORACLE_HOME/rdbms/public"

三、运行程序 otl_test

$ ./otl_test

结果如下：

f1=8, f2=Name8
f1=9, f2=Name9
f1=10, f2=Name10
f1=11, f2=Name11
f1=12, f2=Name12
f1=13, f2=Name13
f1=14, f2=Name14
f1=15, f2=Name15
f1=16, f2=Name16
f1=4, f2=Name4
f1=5, f2=Name5
f1=6, f2=Name6
f1=7, f2=Name7
f1=8, f2=Name8

四、关于OTL更多的信息

请访问OTL的主页：http://otl.sourceforge.net/

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