step4.cpp

通用的数据库中间库

#include <stdio.h>  // for printf
#include <SQLAPI.h> // main SQLAPI++ header

int main(int argc, char* argv[])
{
    SAConnection con; // connection object
    SACommand cmd(
        &con,
        "Select fid, fvarchar20 from test_tbl");    // command object
    
    try
    {
        // connect to database (Oracle in our example)
        con.Connect("test", "tester", "tester", SA_Oracle_Client);

        // Select from our test table
        cmd.Execute();
        // fetch results row by row and print results
        while(cmd.FetchNext())
        {
            printf("Row fetched: fid = %ld, fvarchar20 = '%s'\n", 
                cmd.Field("fid").asLong(),
                (const char*)cmd.Field("fvarchar20").asString());
        }

        // commit changes on success
        con.Commit();

        printf("Rows selected!\n");
    }
    catch(SAException &x)
    {
        // SAConnection::Rollback()
        // can also throw an exception
        // (if a network error for example),
        // we will be ready
        try
        {
            // on error rollback changes
            con.Rollback();
        }
        catch(SAException &)
        {
        }
        // print error message
        printf("%s\n", (const char*)x.ErrText());
    }
    
    return 0;
}