代码拉取完成,页面将自动刷新
// Copyright 2018 Eryx <evorui аt gmail dοt com>, All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package pgsqlgo
import (
"fmt"
"strings"
"github.com/lynkdb/iomix/rdb"
)
const (
filterExprSep = "."
)
var filterOperators = map[string]string{
"eq": "= ?",
"ne": "<> ?",
"gt": "> ?",
"ge": ">= ?",
"lt": "< ?",
"le": "<= ?",
"like": "LIKE ?",
"in": "IN (?)",
}
type filterItem struct {
exprs []string
args []interface{}
filter *Filter
isOr bool
isNot bool
isFilter bool
}
type Filter struct {
params []filterItem
}
func NewFilter() rdb.Filter {
return &Filter{}
}
func (fr *Filter) Reset() rdb.Filter {
fr.params = []filterItem{}
return fr
}
func (fr *Filter) And(expr string, args ...interface{}) rdb.Filter {
if expr == "" || len(args) == 0 {
return nil
}
fr.params = append(fr.params, filterItem{
exprs: strings.Split(expr, filterExprSep),
args: args,
})
return fr
}
func (fr *Filter) Or(expr string, args ...interface{}) rdb.Filter {
if expr == "" || len(args) == 0 {
return nil
}
fr.params = append(fr.params, filterItem{
exprs: strings.Split(expr, filterExprSep),
args: args,
isOr: true,
})
return fr
}
func (fr *Filter) Parse() (where string, params []interface{}) {
if fr == nil || len(fr.params) == 0 {
return
}
for i, p := range fr.params {
if i > 0 {
if p.isOr {
where += "OR "
} else {
where += "AND "
}
}
if p.isNot {
where += "NOT "
}
if p.isFilter {
w, ps := p.filter.Parse()
if w != "" {
w = fmt.Sprintf("( %s) ", w)
}
where += w
params = append(params, ps...)
} else {
operator := ""
if len(p.exprs) == 1 {
p.exprs = append(p.exprs, "eq")
}
if v, ok := filterOperators[p.exprs[1]]; ok {
operator = v
}
if operator == "" {
operator = "= ?"
}
if len(p.exprs) > 1 && p.exprs[1] == "in" && len(p.args) > 1 {
res := []string{}
for i := 0; i < len(p.args); i++ {
res = append(res, "?")
}
where += fmt.Sprintf("%s IN (%s) ", dialectQuoteStr(p.exprs[0]), strings.Join(res, ","))
params = append(params, p.args...)
} else {
where += fmt.Sprintf("%s %s ", dialectQuoteStr(p.exprs[0]), operator)
params = append(params, p.args[0])
}
}
}
return
}
此处可能存在不合适展示的内容,页面不予展示。您可通过相关编辑功能自查并修改。
如您确认内容无涉及 不当用语 / 纯广告导流 / 暴力 / 低俗色情 / 侵权 / 盗版 / 虚假 / 无价值内容或违法国家有关法律法规的内容,可点击提交进行申诉,我们将尽快为您处理。