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Improving the example, showing the column names

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This commit is contained in:
Sébastien Rombauts 2013-03-24 14:13:12 +01:00
parent 7669bcbf90
commit dd9295b1a6
1 changed files with 20 additions and 8 deletions
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28
examples/example1/main.cpp
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@ -46,7 +46,7 @@ public:
// Loop to execute the query step by step, to get one a row of results at a time // Loop to execute the query step by step, to get one a row of results at a time
while (mQuery.executeStep()) while (mQuery.executeStep())
{ {
std::cout << "row : (" << mQuery.getColumn(0) << ", " << mQuery.getColumn(1) << ", " << mQuery.getColumn(2) << ")\n"; std::cout << "row (" << mQuery.getColumn(0) << ", \"" << mQuery.getColumn(1) << "\", " << mQuery.getColumn(2) << ")\n";
} }
// Reset the query to be able to use it again later // Reset the query to be able to use it again later
@ -81,7 +81,7 @@ int main (void)
std::cout << "SQLite statement '" << query.getQuery().c_str() << "' compiled (" << query.getColumnCount () << " columns in the result)\n"; std::cout << "SQLite statement '" << query.getQuery().c_str() << "' compiled (" << query.getColumnCount () << " columns in the result)\n";
// Bind the integer value 2 to the first parameter of the SQL query // Bind the integer value 2 to the first parameter of the SQL query
query.bind(1, 2); query.bind(1, 2);
std::cout << "binded with integer value 2 :\n"; std::cout << "binded with integer value '2' :\n";
// Loop to execute the query step by step, to get one a row of results at a time // Loop to execute the query step by step, to get one a row of results at a time
while (query.executeStep()) while (query.executeStep())
@ -93,9 +93,21 @@ int main (void)
int bytes = query.getColumn(1).getBytes(); int bytes = query.getColumn(1).getBytes();
double weight = query.getColumn(2); // = query.getColumn(2).getInt() double weight = query.getColumn(2); // = query.getColumn(2).getInt()
std::string name(query.getColumn(0).getName()); #ifdef SQLITE_ENABLE_COLUMN_METADATA
static bool bFirst = true;
if (bFirst)
{
// Show how to get the name of a column.
// Requires the SQLITE_ENABLE_COLUMN_METADATA preprocessor macro to be also defined at compile times of the SQLite library.
std::string name0 = query.getColumn(0).getName();
std::string name1 = query.getColumn(1).getName();
std::string name2 = query.getColumn(2).getName();
std::cout << "table 'test' [\"" << name0.c_str() << "\", \"" << name1.c_str() << "\", \"" << name2.c_str() << "\"]\n";
bFirst = false;
}
#endif
std::cout << "row (" << id << ", \"" << value2.c_str() << "\" " << bytes << " bytes, " << weight << ")\n";
std::cout << "row : (" << id << " [" << name.c_str() << "], \"" << value2.c_str() << "\" " << bytes << "B, " << weight << ")\n";
} }
// Reset the query to use it again // Reset the query to use it again
@ -108,7 +120,7 @@ int main (void)
while (query.executeStep()) while (query.executeStep())
{ {
// Demonstrate that inserting column value in a std:ostream is natural // Demonstrate that inserting column value in a std:ostream is natural
std::cout << "row : (" << query.getColumn(0) << ", " << query.getColumn(1) << ", " << query.getColumn(2) << ")\n"; std::cout << "row (" << query.getColumn(0) << ", \"" << query.getColumn(1) << "\", " << query.getColumn(2) << ")\n";
} }
} }
catch (std::exception& e) catch (std::exception& e)
@ -183,7 +195,7 @@ int main (void)
std::cout << "SELECT * FROM test :\n"; std::cout << "SELECT * FROM test :\n";
while (query.executeStep()) while (query.executeStep())
{ {
std::cout << "row : (" << query.getColumn(0) << ", " << query.getColumn(1) << ")\n"; std::cout << "row (" << query.getColumn(0) << ", \"" << query.getColumn(1) << "\")\n";
} }
db.exec("DROP TABLE test"); db.exec("DROP TABLE test");
@ -253,7 +265,7 @@ int main (void)
std::cout << "SELECT * FROM test :\n"; std::cout << "SELECT * FROM test :\n";
while (query.executeStep()) while (query.executeStep())
{ {
std::cout << "row : (" << query.getColumn(0) << ", " << query.getColumn(1) << ")\n"; std::cout << "row (" << query.getColumn(0) << ", \"" << query.getColumn(1) << "\")\n";
} }
} }
catch (std::exception& e) catch (std::exception& e)
@ -313,7 +325,7 @@ int main (void)
SQLite::Column colBlob = query.getColumn(1); SQLite::Column colBlob = query.getColumn(1);
blob = colBlob.getBlob (); blob = colBlob.getBlob ();
size = colBlob.getBytes (); size = colBlob.getBytes ();
std::cout << "row : (" << query.getColumn(0) << ", size=" << size << ")\n"; std::cout << "row (" << query.getColumn(0) << ", size=" << size << ")\n";
size_t sizew = fwrite(blob, 1, size, fp); size_t sizew = fwrite(blob, 1, size, fp);
assert(sizew == size); assert(sizew == size);
fclose (fp); fclose (fp);