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condition.go
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condition.go
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package gormutils
import (
"fmt"
"reflect"
"strconv"
"strings"
"github.com/xiaotushaoxia/kvtag"
"gorm.io/gorm"
)
const (
queryConditionTagName = "cond"
queryConditionTagSep = ";"
//"colum:user;opr:in;split:sting;sep:,"`
queryConditionColum = "colum"
queryConditionOpr = "op"
queryConditionSplit = "split"
queryConditionSep = "sep"
queryConditionPattern = "patten"
// pattern: 会把结构体的值替换pattern字符串中的?
// pattern:?%
// 如 a := Query{Name: "xx"} -> where name like 'xx%'
// split 支持的字符串
_queryConditionString = "string"
_queryConditionInt = "int"
)
// LIKE Operator Description
// WHERE CustomerName LIKE 'a%' Finds any values that start with "a"
// WHERE CustomerName LIKE '%a' Finds any values that end with "a"
// WHERE CustomerName LIKE '%or%' Finds any values that have "or" in any position
// WHERE CustomerName LIKE '_r%' Finds any values that have "r" in the second position
// WHERE CustomerName LIKE 'a_%' Finds any values that start with "a" and are at least 2 characters in length
// WHERE CustomerName LIKE 'a__%' Finds any values that start with "a" and are at least 3 characters in length
// WHERE ContactName LIKE 'a%o' Finds any values that start with "a" and ends with "o" 不支持!!
func WithCondition(cond any) func(*gorm.DB) *gorm.DB {
return func(db *gorm.DB) *gorm.DB {
tagInfo := kvtag.ParserTag(cond, queryConditionTagName, queryConditionTagSep)
v := reflect.Indirect(reflect.ValueOf(cond))
for _, tag := range tagInfo.FieldTags() {
field := v.FieldByName(tag.FieldName)
if !field.IsValid() || field.IsZero() {
continue
}
arg := field.Interface()
st := tag.TagSetting
if isInOpr(st[queryConditionOpr]) {
if argS, isStr := arg.(string); isStr {
arg = trySplitInString(argS, st[queryConditionSplit], st[queryConditionSep])
}
// 太长,拆开
//if !((field.Kind() == reflect.Slice || field.Kind() == reflect.Array) && field.Len() > 0) {
// continue
//}
if !(field.Kind() == reflect.Slice || field.Kind() == reflect.Array) {
continue
}
if field.Len() == 0 {
continue
}
} else if isLikeOpr(st[queryConditionOpr]) {
pattern_ := st[queryConditionPattern]
if pattern_ == "" {
continue
}
arg = strings.ReplaceAll(pattern_, "?", fmt.Sprintf("%v", arg))
}
db = db.Where(fmt.Sprintf("`%s` %s ?", st[queryConditionColum], st[queryConditionOpr]), arg)
}
return db
}
}
// trySplitInString 尝试把 1,2,3 分割成 [1,2,3], 看情况返回[]string或者[]int
// 默认分割成字符串,默认用,分割
func trySplitInString(v string, to string, sep string) any {
if to == "" {
to = _queryConditionString
}
if sep == "" {
sep = ","
}
ss := strings.Split(v, sep)
if to == _queryConditionString {
return ss
}
if to == _queryConditionInt {
var s []int
for _, i2 := range ss {
i, err := strconv.Atoi(i2)
if err != nil {
continue
}
s = append(s, i)
}
if len(s) == 0 {
return nil
}
return s
}
return nil
}
func isLikeOpr(s string) bool {
return strings.ToUpper(s) == "LIKE"
}
func isInOpr(s string) bool {
upper := strings.ToUpper(s)
return upper == "IN" || upper == "NOT IN"
}