func Truncate(session *gocql.Session, table cqlc.Table) {
stmt := fmt.Sprintf("truncate %s", table.TableName())
err := session.Query(stmt).Exec()
if err != nil {
log.Fatalf("Could not %s: %v", stmt, err)
os.Exit(1)
}
}
func (c *Context) Exec(s *gocql.Session) error {
stmt, placeHolders, err := BuildStatement(c)
if err != nil {
return err
}
if c.Debug {
fmt.Printf("%+v bound to stmt: %s\n", placeHolders, stmt)
}
return s.Query(stmt, placeHolders...).Exec()
}
// Returns true if the CAS operation was applied, false otherwise.
// If the operation was applied, then the result bindings will not be popluated.
func (c *Context) Swap(s *gocql.Session) (bool, error) {
if len(c.CASBindings) == 0 {
return false, ErrCASBindings
}
casPlaceHolders := make([]interface{}, len(c.CASBindings))
for i, binding := range c.CASBindings {
casPlaceHolders[i] = binding.Value
}
stmt, queryPlaceholders, err := BuildStatement(c)
if err != nil {
return false, err
}
return s.Query(stmt, queryPlaceholders...).ScanCAS(casPlaceHolders...)
}
func (c *Context) Fetch(s *gocql.Session) (*gocql.Iter, error) {
stmt, err := c.RenderCQL()
if err != nil {
return nil, err
}
// The reason why this is so dynamic is because of WHERE foo IN (?,?,?) clauses
// The factoring for an IN clause is bad, since we are storing an array into the value
// and using reflection to dig it out again
// This should be more strongly typed
placeHolders := make([]interface{}, 0)
for _, cond := range c.Conditions {
v := cond.Binding.Value
switch reflect.TypeOf(v).Kind() {
case reflect.Slice:
{
s := reflect.ValueOf(v)
for i := 0; i < s.Len(); i++ {
placeHolders = append(placeHolders, s.Index(i).Interface())
}
}
case reflect.Array:
{
// Not really happy about having to special case UUIDs
// but this works for now
if val, ok := v.(gocql.UUID); ok {
placeHolders = append(placeHolders, val.Bytes())
} else {
return nil, bindingErrorf("Cannot bind component: %+v (type: %s)", v, reflect.TypeOf(v))
}
}
default:
{
placeHolders = append(placeHolders, &v)
}
}
}
c.Dispose()
if c.Debug {
fmt.Printf("%+v bound to stmt: %s\n", placeHolders, stmt)
}
iter := s.Query(stmt, placeHolders...).Iter()
return iter, nil
}