/*
** Name: loadDbCaps
**
** Description:
** Requests DBMS capabilities from the server and
** initialize dbmsinfo() access.
**
** Input:
** None.
**
** Output:
** None.
**
** Returns:
** void
**
** History:
** 12-Nov-99 (gordy)
** If OPEN_SQL_DATES, use local time rather than gmt.
** 3-Nov-00 (gordy)
** Timezone stuff removed from DbConn. Replaced with a public
** boolean indicating which timezone to use for the connection.
** 7-Mar-01 (gordy)
** Use new class to read DBMS capabilities.
** 10-May-01 (gordy)
** Check DBMS capabilities relevant to driver configuration.
** 20-Feb-02 (gordy)
** Added dbmsInfo checks for DBMS type and protocol level.
** 31-Oct-02 (gordy)
** Adapted for generic GCF driver.
** 23-Dec-02 (gordy)
** Connection level ID changed at protocol level 3.
*/
public void loadDbCaps()
{
String value;
int ivalue;
/*
** Initialize helper classes and load DB capabilities.
*/
dbInfo = new DbInfo( this );
dbCaps = new DbCaps( this );
dbCaps.loadDbCaps();
/*
** Check DB capabilties.
*/
;
if ( (value = dbCaps.getDbCap( (msg_protocol_level < MSG_PROTO_3)
? DrvConst.DRV_DBCAP_CONNECT_LVL0
: DrvConst.DRV_DBCAP_CONNECT_LVL1 )) != null )
try { db_protocol_level = Byte.Parse( value ); }
catch( Exception ) {}
if ( (value = dbCaps.getDbCap( DBMS_DBCAP_DBMS_TYPE )) != null )
is_ingres = ToInvariantUpper(value).Equals( DBMS_TYPE_INGRES );
if ((value = dbCaps.getDbCap(DBMS_DBCAP_ING_SQL_LVL)) != null)
try { sqlLevel = Int32.Parse(value); }
catch (Exception) { }
// How the native timestamp type reacts to timezones,
// lack of it indicates an Ingres DBMS
if ((value = dbCaps.getDbCap(DBMS_DBCAP_OSQL_DATES)) != null)
osql_dates = true; // TODO: check for 'LEVEL 1'
if ( (value = dbCaps.getDbCap( DBMS_DBCAP_UCS2_TYPES )) != null &&
value.Length >= 1 )
ucs2_supported = (value[0] == 'Y' || value[0] == 'y');
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_CHR_COL)) != null)
try { max_char_len = Int32.Parse(value); }
catch (Exception) { }
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_VCH_COL)) != null)
try { max_vchr_len = Int32.Parse(value); }
catch (Exception) { }
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_BYT_COL)) != null)
try { max_byte_len = Int32.Parse(value); }
catch (Exception) { }
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_VBY_COL)) != null)
try { max_vbyt_len = Int32.Parse(value); }
catch (Exception) { }
/*
** The NCS max column lengths default to half (two bytes per char)
** the max for regular columns to match prior behaviour.
*/
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_NCHR_COL)) == null)
max_nchr_len = max_char_len / 2;
else
try { max_nchr_len = Int32.Parse(value); }
catch (Exception) { }
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_NVCH_COL)) == null)
max_nvch_len = max_vchr_len / 2;
else
try { max_nvch_len = Int32.Parse(value); }
catch (Exception) { }
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_DEC_PREC)) != null)
if (Int32.TryParse(value, out ivalue)) // convert value to int ivalue
max_dec_prec = ivalue;
return;
}
loadDbCaps()
{
String value;
int ivalue;
/*
** Initialize helper classes and load DB capabilities.
*/
dbInfo = new DbInfo(this);
dbCaps = new DbCaps(this);
dbCaps.loadDbCaps();
/*
** Check DB capabilties.
*/
;
if ((value = dbCaps.getDbCap((msg_protocol_level < MSG_PROTO_3)
? DrvConst.DRV_DBCAP_CONNECT_LVL0
: DrvConst.DRV_DBCAP_CONNECT_LVL1)) != null)
{
try { db_protocol_level = Byte.Parse(value); }
catch (Exception) {}
}
if ((value = dbCaps.getDbCap(DBMS_DBCAP_DBMS_TYPE)) != null)
{
is_ingres = ToInvariantUpper(value).Equals(DBMS_TYPE_INGRES);
}
if ((value = dbCaps.getDbCap(DBMS_DBCAP_ING_SQL_LVL)) != null)
{
try { sqlLevel = Int32.Parse(value); }
catch (Exception) { }
}
// How the native timestamp type reacts to timezones,
// lack of it indicates an Ingres DBMS
if ((value = dbCaps.getDbCap(DBMS_DBCAP_OSQL_DATES)) != null)
{
osql_dates = true; // TODO: check for 'LEVEL 1'
}
if ((value = dbCaps.getDbCap(DBMS_DBCAP_UCS2_TYPES)) != null &&
value.Length >= 1)
{
ucs2_supported = (value[0] == 'Y' || value[0] == 'y');
}
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_CHR_COL)) != null)
{
try { max_char_len = Int32.Parse(value); }
catch (Exception) { }
}
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_VCH_COL)) != null)
{
try { max_vchr_len = Int32.Parse(value); }
catch (Exception) { }
}
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_BYT_COL)) != null)
{
try { max_byte_len = Int32.Parse(value); }
catch (Exception) { }
}
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_VBY_COL)) != null)
{
try { max_vbyt_len = Int32.Parse(value); }
catch (Exception) { }
}
/*
** The NCS max column lengths default to half (two bytes per char)
** the max for regular columns to match prior behaviour.
*/
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_NCHR_COL)) == null)
{
max_nchr_len = max_char_len / 2;
}
else
{
try { max_nchr_len = Int32.Parse(value); }
catch (Exception) { }
}
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_NVCH_COL)) == null)
{
max_nvch_len = max_vchr_len / 2;
}
else
{
try { max_nvch_len = Int32.Parse(value); }
catch (Exception) { }
}
if ((value = dbCaps.getDbCap(DBMS_DBCAP_MAX_DEC_PREC)) != null)
{
if (Int32.TryParse(value, out ivalue)) // convert value to int ivalue
{
max_dec_prec = ivalue;
}
}
return;
} // loadDbCaps()
