/**
* escape a column's value, or return the default value if none specified
*
* @NOTE: it is critical to note that colmn values should always be escaped with this function
* as it also converts MSSQL specific values from postgresql ones
*
* @return string
*/
public static function column_value_default($node_schema, $node_table, $data_column_name, $node_col)
{
// if marked, make it null or default, depending on column options
if (isset($node_col['null']) && strcasecmp('true', $node_col['null']) == 0) {
return 'NULL';
}
// columns that specify empty attribute are made empty strings
if (isset($node_col['empty']) && strcasecmp('true', $node_col['empty']) == 0) {
return "''";
}
// don't esacape columns marked literal sql values
if (isset($node_col['sql']) && strcasecmp($node_col['sql'], 'true') == 0) {
return '(' . $node_col . ')';
}
$node_column = dbx::get_table_column($node_table, $data_column_name);
if ($node_column === NULL) {
throw new exception("Failed to find table " . $node_table['name'] . " column " . $data_column_name . " for default value check");
}
$value_type = mysql5_column::column_type(dbsteward::$new_database, $node_schema, $node_table, $node_column);
// else if col is zero length, make it default, or DB NULL
if (strlen($node_col) == 0) {
// is there a default defined for the column?
$dummy_data_column = new stdClass();
$column_default_value = xml_parser::column_default_value($node_table, $data_column_name, $dummy_data_column);
if ($column_default_value != NULL) {
// run default value through value_escape to allow data value conversions to happen
$value = mysql5::value_escape($value_type, $column_default_value);
} else {
$value = 'NULL';
}
} else {
$value = mysql5::value_escape($value_type, dbsteward::string_cast($node_col));
}
return $value;
}