diff options
Diffstat (limited to 'src/interfaces/libpq++/examples/testlibpq2.cc')
| -rw-r--r-- | src/interfaces/libpq++/examples/testlibpq2.cc | 100 |
1 files changed, 52 insertions, 48 deletions
diff --git a/src/interfaces/libpq++/examples/testlibpq2.cc b/src/interfaces/libpq++/examples/testlibpq2.cc index 1a602e16b73..9bad37e3cdf 100644 --- a/src/interfaces/libpq++/examples/testlibpq2.cc +++ b/src/interfaces/libpq++/examples/testlibpq2.cc @@ -1,10 +1,10 @@ /* - * testlibpq2.cc - * Test the C++ version of LIBPQ, the POSTGRES frontend library. - * - * queries the template1 database for a list of database names using transaction block - * - */ +* testlibpq2.cc +* Test the C++ version of LIBPQ, the POSTGRES frontend library. +* +* queries the template1 database for a list of database names using transaction block +* +*/ #include <iostream.h> #include <iomanip.h> @@ -12,46 +12,50 @@ int main() { - // Begin, by establishing a connection to the backend. - // When no parameters are given then the system will - // try to use reasonable defaults by looking up environment variables - // or, failing that, using hardwired constants - const char* dbName = "dbname=template1"; - PgTransaction data(dbName); - - // check to see that the backend connection was successfully made - if ( data.ConnectionBad() ) { - cerr << "Connection to database '" << dbName << "' failed." << endl - << "Error returned: " << data.ErrorMessage() << endl; - exit(1); - } - - // submit command to the backend - if ( !data.ExecCommandOk("DECLARE myportal CURSOR FOR select * from pg_database") ) { - cerr << "DECLARE CURSOR command failed" << endl; - exit(1); - } - - // fetch instances from the pg_database, the system catalog of databases - if ( !data.ExecTuplesOk("FETCH ALL in myportal") ) { - cerr << "FETCH ALL command didn't return tuples properly" << endl; - exit(1); - } - - // first, print out the attribute names - int nFields = data.Fields(); - for (int i=0; i < nFields; i++) - cout << setiosflags(ios::right) << setw(15) << data.FieldName(i); - cout << endl << endl; - - // next, print out the instances - for (int i=0; i < data.Tuples(); i++) { - for (int j=0; j < nFields; j++) - cout << setiosflags(ios::right) << setw(15) << data.GetValue(i,j); - cout << endl; - } - - // close the portal - data.Exec("CLOSE myportal"); - return 0; + // Begin, by establishing a connection to the backend. + // When no parameters are given then the system will + // try to use reasonable defaults by looking up environment variables + // or, failing that, using hardwired constants + const char* dbName = "dbname=template1"; + PgTransaction data(dbName); + + // check to see that the backend connection was successfully made + if ( data.ConnectionBad() ) + { + cerr << "Connection to database '" << dbName << "' failed." << endl + << "Error returned: " << data.ErrorMessage() << endl; + exit(1); + } + + // submit command to the backend + if ( !data.ExecCommandOk("DECLARE myportal CURSOR FOR select * from pg_database") ) + { + cerr << "DECLARE CURSOR command failed" << endl; + exit(1); + } + + // fetch instances from the pg_database, the system catalog of databases + if ( !data.ExecTuplesOk("FETCH ALL in myportal") ) + { + cerr << "FETCH ALL command didn't return tuples properly" << endl; + exit(1); + } + + // first, print out the attribute names + int nFields = data.Fields(); + for (int i = 0; i < nFields; i++) + cout << setiosflags(ios::right) << setw(15) << data.FieldName(i); + cout << endl << endl; + + // next, print out the instances + for (int i = 0; i < data.Tuples(); i++) + { + for (int j = 0; j < nFields; j++) + cout << setiosflags(ios::right) << setw(15) << data.GetValue(i, j); + cout << endl; + } + + // close the portal + data.Exec("CLOSE myportal"); + return 0; } |