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core.go
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core.go
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package gsql
import (
"fmt"
"reflect"
"strings"
"sync"
)
var cacheMap sync.Map
type sqlType struct {
Names []string
ColumnsMap map[string]*sqlColumn
}
type sqlColumn struct {
Index int // field 序号
Name string // field name
Field string // tag sql_field
Operator string // tag sql_operator
Expr string // tag sql_expr
IsAnonymous bool // field 是否是匿名字段
Kind reflect.Kind // field Kind
}
func parseType(t reflect.Type) (*sqlType, error) {
sqlType := loadTypeFromCache(t)
if sqlType != nil {
return sqlType, nil
}
parsedType, err := parseTypeSlow(t)
if err != nil {
return nil, err
}
cacheMap.Store(t, parsedType)
return parsedType, nil
}
func loadTypeFromCache(t reflect.Type) *sqlType {
v, ok := cacheMap.Load(t)
if ok {
sqlType := v.(*sqlType)
return sqlType
}
return nil
}
func parseTypeSlow(structType reflect.Type) (_ *sqlType, err error) {
result, err := parseTypeRev(structType, nil, false)
if err != nil {
return nil, err
}
for _, name := range result.Names {
column := result.ColumnsMap[name]
if column == nil {
return nil, fmt.Errorf("field(%s) column not found", name)
}
if column.Expr != "" {
if _, ok := updaterMap[column.Expr]; !ok {
return nil, fmt.Errorf("field(%s) operator(%s) invalid", column.Name, column.Operator)
}
}
}
return result, nil
}
func parseTypeRev(structType reflect.Type, sType *sqlType, isField bool) (_ *sqlType, err error) {
if structType.Kind() == reflect.Ptr {
structType = structType.Elem()
}
if isField && (structType.Kind() != reflect.Struct && structType.Kind() != reflect.Slice) {
return nil, fmt.Errorf("opt kind must be struct, but got %s", structType.Kind())
}
if sType == nil {
sType = &sqlType{
ColumnsMap: map[string]*sqlColumn{},
}
}
for i := 0; i < structType.NumField(); i++ {
structField := structType.Field(i)
sqlField := strings.TrimSpace(structField.Tag.Get("sql_field"))
sqlOperator := strings.TrimSpace(structField.Tag.Get("sql_operator"))
sqlExpr := strings.TrimSpace(structField.Tag.Get("sql_expr"))
// 忽略 tag
if sqlField == "-" || (sqlField == "" && sqlExpr == "$or") {
continue
}
if sqlExpr == "$or" {
return nil, fmt.Errorf("struct field(%s) with mix of sql_field(%v) and expr(%s) invalid", structField.Name, sqlField, sqlExpr)
}
if err := checkField(structField, sqlField); err != nil {
return nil, err
}
if structField.Anonymous {
// 内嵌结构体,递归处理
t := structField.Type
if t.Kind() == reflect.Ptr {
t = t.Elem()
}
childSType, err := parseTypeRev(t, sType, true)
if err != nil {
return nil, err
}
for kk, vv := range childSType.ColumnsMap {
if _, ok := sType.ColumnsMap[kk]; !ok {
sType.ColumnsMap[kk] = vv
sType.Names = append(sType.Names, kk)
}
}
} else {
if sqlOperator != "" {
if err := checkOperator(structField, sqlOperator); err != nil {
return nil, err
}
}
if sqlExpr != "" {
if _, ok := updaterMap[sqlExpr]; !ok {
return nil, fmt.Errorf("field(%s) expr(%s) invalid", structField.Name, sqlExpr)
}
}
column := &sqlColumn{
Index: i,
Name: structField.Name,
Field: sqlField,
Operator: sqlOperator,
Expr: sqlExpr,
IsAnonymous: structField.Anonymous,
Kind: structField.Type.Kind(),
}
// 已经有这个 name 的 field 这说明需要覆盖
if _, ok := sType.ColumnsMap[structField.Name]; ok {
reOrderNames(sType, structField.Name)
} else {
sType.Names = append(sType.Names, structField.Name)
}
sType.ColumnsMap[structField.Name] = column
}
}
return sType, nil
}
func reOrderNames(sType *sqlType, name string) {
for idx, n := range sType.Names {
if n == name {
copy(sType.Names[idx:], sType.Names[idx+1:])
sType.Names[len(sType.Names)-1] = name
break
}
}
}
func checkField(structField reflect.StructField, sqlField string) error {
if structField.Anonymous && sqlField != "" {
return fmt.Errorf("field %s is anonymous that can not have sql_field tag", structField.Name)
}
if !structField.Anonymous {
if structField.Type.Kind() != reflect.Ptr && structField.Type.Kind() != reflect.Slice {
return fmt.Errorf("struct field(%s) must be pointer, but got %s", structField.Name, structField.Type.Kind())
}
if sqlField == "" {
return fmt.Errorf("struct field(%s) need sql_field tag", structField.Name)
}
}
return nil
}
func checkOperator(field reflect.StructField, sqlOperator string) error {
if _, ok := whereMap[sqlOperator]; !ok {
return fmt.Errorf("field(%s) operator(%s) invalid", field.Name, sqlOperator)
}
if field.Type.Kind() != reflect.Ptr {
// in 操作,是数组,不是指针
if field.Type.Kind() == reflect.Slice && isOperatorSupportArray(sqlOperator) {
// continue
} else if field.Type.Kind() == reflect.Slice && field.Name == "Select" {
// continue
} else {
return fmt.Errorf("struct field(%s) must be pointer, but got %s", field.Name, field.Type.Kind())
}
}
return nil
}
func isOperatorSupportArray(s string) bool {
return s == "in" || s == "not in" || s == "json_contains" || s == "json_contains any" || s == "json_contains all"
}