func (node *Node) execAnalyzeUpdateExpressions(pkIndex *schema.Index) (updateColumns []Pair, status updateStatus) {
updateColumns = make([]Pair, node.Len())
for i := 0; i < node.Len(); i++ {
columnName := string(node.At(i).At(0).Value)
index := pkIndex.FindColumn(columnName)
if index != -1 {
// update pkvalues not supported
return nil, updatePkValue
}
value := node.At(i).At(1).execAnalyzeValue()
if value == nil {
log.Warn("unsupported update expression", node.At(i).At(0))
return nil, updateUnsupport
}
log.Info(string(value.Value))
updateColumns[i] = Pair{columnName, string(value.Value)}
}
return updateColumns, updateOk
}
func (node *Node) execAnalyzeUpdateExpressions(pkIndex *schema.Index) (pkValues []interface{}, ok bool) {
for i := 0; i < node.Len(); i++ {
columnName := string(node.At(i).At(0).Value)
index := pkIndex.FindColumn(columnName)
if index == -1 {
continue
}
value := node.At(i).At(1).execAnalyzeValue()
if value == nil {
log.Warn("expression is too complex %v", node.At(i).At(0))
return nil, false
}
if pkValues == nil {
pkValues = make([]interface{}, len(pkIndex.Columns))
}
pkValues[index] = asInterface(value)
}
return pkValues, true
}