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package search
import (
"fmt"
"reflect"
"strings"
)
const (
// FromQueryTag tag标记
FromQueryTag = "search"
// Mysql 数据库标识
Mysql = "mysql"
// Postgres 数据库标识
Postgres = "postgres"
)
// ResolveSearchQuery 解析
/**
* exact / iexact 等于
* contains / icontains 包含
* gt / gte 大于 / 大于等于
* lt / lte 小于 / 小于等于
* startswith / istartswith 以…起始
* endswith / iendswith 以…结束
* in
* isnull
* order 排序 e.g. order[key]=desc order[key]=asc
*/
func ResolveSearchQuery(driver string, q interface{}, condition Condition) {
qType := reflect.TypeOf(q)
qValue := reflect.ValueOf(q)
var tag string
var ok bool
var t *resolveSearchTag
for i := 0; i < qType.NumField(); i++ {
tag, ok = "", false
tag, ok = qType.Field(i).Tag.Lookup(FromQueryTag)
if !ok {
//递归调用
ResolveSearchQuery(driver, qValue.Field(i).Interface(), condition)
continue
}
switch tag {
case "-":
continue
}
t = makeTag(tag)
if qValue.Field(i).IsZero() {
continue
}
//解析
switch t.Type {
case "left":
//左关联
join := condition.SetJoinOn(t.Type, fmt.Sprintf(
"left join `%s` on `%s`.`%s` = `%s`.`%s`",
t.Join,
t.Join,
t.On[0],
t.Table,
t.On[1],
))
ResolveSearchQuery(driver, qValue.Field(i).Interface(), join)
case "exact", "iexact":
condition.SetWhere(fmt.Sprintf("`%s`.`%s` = ?", t.Table, t.Column), []interface{}{qValue.Field(i).Interface()})
case "contains", "icontains":
//fixme mysql不支持ilike
if driver == Postgres && t.Type == "icontains" {
condition.SetWhere(fmt.Sprintf("`%s`.`%s` ilike ?", t.Table, t.Column), []interface{}{"%" + qValue.Field(i).String() + "%"})
} else {
condition.SetWhere(fmt.Sprintf("`%s`.`%s` like ?", t.Table, t.Column), []interface{}{"%" + qValue.Field(i).String() + "%"})
}
case "gt":
condition.SetWhere(fmt.Sprintf("`%s`.`%s` > ?", t.Table, t.Column), []interface{}{qValue.Field(i).Interface()})
case "gte":
condition.SetWhere(fmt.Sprintf("`%s`.`%s` >= ?", t.Table, t.Column), []interface{}{qValue.Field(i).Interface()})
case "lt":
condition.SetWhere(fmt.Sprintf("`%s`.`%s` < ?", t.Table, t.Column), []interface{}{qValue.Field(i).Interface()})
case "lte":
condition.SetWhere(fmt.Sprintf("`%s`.`%s` <= ?", t.Table, t.Column), []interface{}{qValue.Field(i).Interface()})
case "startswith", "istartswith":
if driver == Postgres && t.Type == "istartswith" {
condition.SetWhere(fmt.Sprintf("`%s`.`%s` ilike ?", t.Table, t.Column), []interface{}{qValue.Field(i).String() + "%"})
} else {
condition.SetWhere(fmt.Sprintf("`%s`.`%s` like ?", t.Table, t.Column), []interface{}{qValue.Field(i).String() + "%"})
}
case "endswith", "iendswith":
if driver == Postgres && t.Type == "iendswith" {
condition.SetWhere(fmt.Sprintf("`%s`.`%s` ilike ?", t.Table, t.Column), []interface{}{"%" + qValue.Field(i).String()})
} else {
condition.SetWhere(fmt.Sprintf("`%s`.`%s` like ?", t.Table, t.Column), []interface{}{"%" + qValue.Field(i).String()})
}
case "in":
condition.SetWhere(fmt.Sprintf("`%s`.`%s` in (?)", t.Table, t.Column), []interface{}{qValue.Field(i).Interface()})
case "isnull":
if !(qValue.Field(i).IsZero() && qValue.Field(i).IsNil()) {
condition.SetWhere(fmt.Sprintf("`%s`.`%s` isnull", t.Table, t.Column), make([]interface{}, 0))
}
case "order":
switch strings.ToLower(qValue.Field(i).String()) {
case "desc", "asc":
condition.SetOrder(fmt.Sprintf("`%s`.`%s` %s", t.Table, t.Column, qValue.Field(i).String()))
}
}
}
}
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