sqlselect.C: localhost/test","nobody", "");
#ifndef __CINT__
#include <TSQLServer.h>
#include <TSQLResult.h>
#include <TSQLRow.h>
#endif
void sqlselect()
{
TSQLServer *db = TSQLServer::Connect("mysql://localhost/test","nobody", "");
printf("Server info: %s\n", db->ServerInfo());
TSQLRow *row;
TSQLResult *res;
// list databases available on server
printf("\nList all databases on server %s\n", db->GetHost());
res = db->GetDataBases();
while ((row = res->Next())) {
printf("%s\n", row->GetField(0));
delete row;
}
delete res;
// list tables in database "test" (the permission tables)
printf("\nList all tables in database \"test\" on server %s\n",
db->GetHost());
res = db->GetTables("test");
while ((row = res->Next())) {
printf("%s\n", row->GetField(0));
delete row;
}
delete res;
// list columns in table "runcatalog" in database "mysql"
printf("\nList all columns in table \"runcatalog\" in database \"test\" on server %s\n",
db->GetHost());
res = db->GetColumns("test", "runcatalog");
while ((row = res->Next())) {
printf("%s\n", row->GetField(0));
delete row;
}
delete res;
// start timer
TStopwatch timer;
timer.Start();
// query database and print results
const char *sql = "select dataset,rawfilepath from test.runcatalog "
"WHERE tag&(1<<2) AND (run=490001 OR run=300122)";
// const char *sql = "select count(*) from test.runcatalog "
// "WHERE tag&(1<<2)";
res = db->Query(sql);
int nrows = res->GetRowCount();
printf("\nGot %d rows in result\n", nrows);
int nfields = res->GetFieldCount();
for (int i = 0; i < nfields; i++)
printf("%40s", res->GetFieldName(i));
printf("\n");
for (int i = 0; i < nfields*40; i++)
printf("=");
printf("\n");
for (int i = 0; i < nrows; i++) {
row = res->Next();
for (int j = 0; j < nfields; j++) {
printf("%40s", row->GetField(j));
}
printf("\n");
delete row;
}
delete res;
delete db;
// stop timer and print results
timer.Stop();
Double_t rtime = timer.RealTime();
Double_t ctime = timer.CpuTime();
printf("\nRealTime=%f seconds, CpuTime=%f seconds\n", rtime, ctime);
}
Last change: Wed Dec 17 10:56:42 2008
Last generated: 2008-12-17 10:56
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