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NodeForEach.go
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NodeForEach.go
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package ast
import (
"bytes"
"errors"
"github.com/zhuxiujia/GoMybatis/stmt"
"reflect"
)
//foreach 节点
type NodeForEach struct {
childs []Node
t NodeType
collection string
index string
item string
open string
close string
separator string
holder *NodeConfigHolder
}
func (it *NodeForEach) Type() NodeType {
return NForEach
}
func (it *NodeForEach) Eval(env map[string]interface{}, arg_array *[]interface{}, stmtConvert stmt.StmtIndexConvert) ([]byte, error) {
if it.collection == "" {
panic(`[GoMybatis] collection value can not be "" in <foreach collection=""> !`)
}
var tempSql bytes.Buffer
//exec lexer
var err error
evalData, err := it.holder.GetExpressionEngineProxy().LexerAndEval(it.collection, env)
if err != nil {
return nil, errors.New(it.holder.GetExpressionEngineProxy().Name() + ":" + err.Error())
}
var collectionValue = reflect.ValueOf(evalData)
var kind = collectionValue.Kind()
if kind == reflect.Invalid {
return nil, errors.New(it.holder.GetExpressionEngineProxy().Name() + ": collection value is invalid value!")
}
if kind != reflect.Slice && kind != reflect.Array && kind != reflect.Map {
panic(`[GoMybatis] collection value must be a slice or map !`)
}
var collectionValueLen = collectionValue.Len()
if collectionValueLen == 0 {
return nil, nil
}
if it.index == "" {
it.index = "index"
}
if it.item == "" {
it.item = "item"
}
switch collectionValue.Kind() {
case reflect.Map:
var mapKeys = collectionValue.MapKeys()
var collectionKeyLen = len(mapKeys)
if collectionKeyLen == 0 {
return nil, nil
}
var tempArgMap = env
for _, keyValue := range mapKeys {
var key = keyValue.Interface()
var collectionItem = collectionValue.MapIndex(keyValue)
if it.item != "" {
tempArgMap[it.item] = collectionItem.Interface()
}
tempArgMap[it.index] = key
var r, err = DoChildNodes(it.childs, tempArgMap, arg_array, stmtConvert)
if err != nil {
return nil, err
}
if r != nil {
tempSql.Write(r)
}
tempSql.WriteString(it.separator)
delete(tempArgMap, it.item)
}
break
case reflect.Slice:
var tempArgMap = env
for i := 0; i < collectionValueLen; i++ {
var collectionItem = collectionValue.Index(i)
if it.item != "" {
tempArgMap[it.item] = collectionItem.Interface()
}
if it.index != "" {
tempArgMap[it.index] = i
}
var r, err = DoChildNodes(it.childs, tempArgMap, arg_array, stmtConvert)
if err != nil {
return nil, err
}
if r != nil {
tempSql.Write(r)
}
tempSql.WriteString(it.separator)
delete(tempArgMap, it.item)
}
break
}
var newTempSql bytes.Buffer
var tempSqlString = bytes.Trim(tempSql.Bytes(), it.separator)
tempSql.Reset()
newTempSql.WriteString(it.open)
newTempSql.Write(tempSqlString)
newTempSql.WriteString(it.close)
var newTempSqlBytes = newTempSql.Bytes()
newTempSql.Reset()
return newTempSqlBytes, nil
}