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update.go
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package sqb
type SetArg struct {
Key Column
Value Col
}
func (sa SetArg) WriteSQLTo(w SQLWriter) error {
err := sa.Key.WriteSQLTo(w)
if err != nil {
return err
}
_, err = w.WriteString(` = `)
if err != nil {
return err
}
return sa.Value.WriteSQLTo(w)
}
type SetStmt []SetArg
func (ss SetStmt) WriteSQLTo(w SQLWriter) error {
if len(ss) == 0 {
return nil
}
_, err := w.WriteString(`SET `)
if err != nil {
return err
}
err = ss[0].WriteSQLTo(w)
if err != nil {
return err
}
if len(ss) == 1 {
return nil
}
for _, s := range ss[1:] {
_, err = w.WriteString(", ")
if err != nil {
return err
}
err = s.WriteSQLTo(w)
if err != nil {
return err
}
}
return nil
}
type UpdateStmt struct {
Table TableIdentifier
Set SetStmt
WhereStmt WhereStmt
ReturningStmt ReturningStmt
}
func (us UpdateStmt) WriteSQLTo(w SQLWriter) error {
_, err := w.WriteString(`UPDATE `)
if err != nil {
return err
}
err = us.Table.WriteSQLTo(w)
if err != nil {
return err
}
_, err = w.WriteString(` `)
if err != nil {
return err
}
err = us.Set.WriteSQLTo(w)
if err != nil {
return err
}
if !us.WhereStmt.Empty() {
_, err = w.WriteString(` `)
if err != nil {
return err
}
err = us.WhereStmt.WriteSQLTo(w)
if err != nil {
return err
}
}
// must be last statement
if us.ReturningStmt.Cols != nil {
err = us.ReturningStmt.WriteSQLTo(w)
if err != nil {
return err
}
}
return nil
}
func (us UpdateStmt) Returning(cc ...Col) UpdateStmt {
us.ReturningStmt.Cols = NewColumnList(cc...)
return us
}