mirror of
https://gitee.com/johng/gf.git
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384 lines
11 KiB
Go
384 lines
11 KiB
Go
// Copyright 2017-2018 gf Author(https://github.com/gogf/gf). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://github.com/gogf/gf.
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package gdb
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import (
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"bytes"
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"database/sql"
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"errors"
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"fmt"
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"github.com/gogf/gf/internal/empty"
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"github.com/gogf/gf/os/gtime"
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"reflect"
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"strings"
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"time"
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"github.com/gogf/gf/internal/structs"
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"github.com/gogf/gf/text/gregex"
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"github.com/gogf/gf/text/gstr"
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"github.com/gogf/gf/util/gconv"
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)
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// Type assert api for String.
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type apiString interface {
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String() string
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}
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// Type assert api for Iterator.
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type apiIterator interface {
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Iterator(f func(key, value interface{}) bool)
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}
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// Type assert api for Interfaces.
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type apiInterfaces interface {
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Interfaces() []interface{}
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}
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const (
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ORM_TAG_FOR_STRUCT = "orm"
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ORM_TAG_FOR_UNIQUE = "unique"
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ORM_TAG_FOR_PRIMARY = "primary"
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)
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// 获得struct对象对应的where查询条件
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func GetWhereConditionOfStruct(pointer interface{}) (where string, args []interface{}) {
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array := ([]string)(nil)
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for tag, field := range structs.TagMapField(pointer, []string{ORM_TAG_FOR_STRUCT}, true) {
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array = strings.Split(tag, ",")
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if len(array) > 1 && gstr.InArray([]string{ORM_TAG_FOR_UNIQUE, ORM_TAG_FOR_PRIMARY}, array[1]) {
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return array[0], []interface{}{field.Value()}
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}
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if len(where) > 0 {
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where += " "
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}
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where += tag + "=?"
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args = append(args, field.Value())
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}
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return
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}
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// 获得orm标签与属性的映射关系
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func GetOrmMappingOfStruct(pointer interface{}) map[string]string {
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mapping := make(map[string]string)
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for tag, attr := range structs.TagMapName(pointer, []string{ORM_TAG_FOR_STRUCT}, true) {
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mapping[strings.Split(tag, ",")[0]] = attr
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}
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return mapping
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}
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// 格式化SQL语句.
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func formatQuery(query string, args []interface{}) (newQuery string, newArgs []interface{}) {
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return handlerSliceArguments(query, args)
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}
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// 格式化Where查询条件。
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// TODO []interface{} type support for parameter <where> does not completed yet.
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func formatWhere(db DB, where interface{}, args []interface{}, omitEmpty bool) (newWhere string, newArgs []interface{}) {
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buffer := bytes.NewBuffer(nil)
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rv := reflect.ValueOf(where)
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kind := rv.Kind()
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if kind == reflect.Ptr {
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rv = rv.Elem()
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kind = rv.Kind()
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}
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switch kind {
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case reflect.Array, reflect.Slice:
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newArgs = formatWhereInterfaces(db, gconv.Interfaces(where), buffer, newArgs)
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case reflect.Map:
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for key, value := range varToMapDeep(where) {
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if omitEmpty && empty.IsEmpty(value) {
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continue
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}
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newArgs = formatWhereKeyValue(db, buffer, newArgs, key, value)
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}
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case reflect.Struct:
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// If <where> struct implements apiIterator interface,
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// it then uses its Iterate function to iterates its key-value pairs.
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// For example, ListMap and TreeMap are ordered map,
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// which implement apiIterator interface and are index-friendly for where conditions.
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if iterator, ok := where.(apiIterator); ok {
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iterator.Iterator(func(key, value interface{}) bool {
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if omitEmpty && empty.IsEmpty(value) {
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return true
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}
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newArgs = formatWhereKeyValue(db, buffer, newArgs, gconv.String(key), value)
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return true
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})
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break
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}
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// TODO garray support.
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for key, value := range varToMapDeep(where) {
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if omitEmpty && empty.IsEmpty(value) {
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continue
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}
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newArgs = formatWhereKeyValue(db, buffer, newArgs, key, value)
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}
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default:
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buffer.WriteString(gconv.String(where))
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}
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if buffer.Len() == 0 {
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return "", args
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}
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newArgs = append(newArgs, args...)
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newWhere = buffer.String()
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if len(newArgs) > 0 {
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// It supports formats like: Where/And/Or("uid", 1) , Where/And/Or("uid>=", 1)
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if gstr.Pos(newWhere, "?") == -1 {
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if lastOperatorReg.MatchString(newWhere) {
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newWhere += "?"
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} else if wordReg.MatchString(newWhere) {
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newWhere += "=?"
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}
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}
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}
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return handlerSliceArguments(newWhere, newArgs)
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}
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// formatWhereInterfaces formats <where> as []interface{}.
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// TODO []interface{} type support for parameter <where> does not completed yet.
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func formatWhereInterfaces(db DB, where []interface{}, buffer *bytes.Buffer, newArgs []interface{}) []interface{} {
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var str string
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var array []interface{}
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var holderCount int
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for i := 0; i < len(where); {
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if holderCount > 0 {
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array = gconv.Interfaces(where[i])
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newArgs = append(newArgs, array...)
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holderCount -= len(array)
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} else {
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str = gconv.String(where[i])
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holderCount = gstr.Count(str, "?")
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buffer.WriteString(str)
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}
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}
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return newArgs
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}
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// formatWhereKeyValue handles each key-value pair of the parameter map.
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func formatWhereKeyValue(db DB, buffer *bytes.Buffer, newArgs []interface{}, key string, value interface{}) []interface{} {
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key = db.quoteWord(key)
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if buffer.Len() > 0 {
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buffer.WriteString(" AND ")
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}
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// 支持slice键值/属性，如果只有一个?占位符号，那么作为IN查询，否则打散作为多个查询参数
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rv := reflect.ValueOf(value)
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switch rv.Kind() {
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case reflect.Slice, reflect.Array:
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count := gstr.Count(key, "?")
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if count == 0 {
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buffer.WriteString(key + " IN(?)")
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newArgs = append(newArgs, value)
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} else if count != rv.Len() {
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buffer.WriteString(key)
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newArgs = append(newArgs, value)
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} else {
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buffer.WriteString(key)
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// 如果键名/属性名称中带有多个?占位符号，那么将参数打散
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newArgs = append(newArgs, gconv.Interfaces(value)...)
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}
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default:
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if value == nil {
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buffer.WriteString(key)
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} else {
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// 支持key带操作符号，注意like也算是操作符号
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key = gstr.Trim(key)
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if gstr.Pos(key, "?") == -1 {
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like := " like"
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if len(key) > len(like) && gstr.Equal(key[len(key)-len(like):], like) {
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buffer.WriteString(key + " ?")
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} else if lastOperatorReg.MatchString(key) {
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buffer.WriteString(key + " ?")
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} else {
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buffer.WriteString(key + "=?")
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}
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} else {
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buffer.WriteString(key)
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}
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newArgs = append(newArgs, value)
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}
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}
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return newArgs
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}
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// 将对象转换为map，如果对象带有继承对象，那么执行递归转换。
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// 该方法用于将变量传递给数据库执行之前。
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func varToMapDeep(obj interface{}) map[string]interface{} {
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data := gconv.Map(obj, ORM_TAG_FOR_STRUCT)
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for key, value := range data {
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rv := reflect.ValueOf(value)
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kind := rv.Kind()
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if kind == reflect.Ptr {
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rv = rv.Elem()
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kind = rv.Kind()
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}
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switch kind {
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case reflect.Struct:
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// 底层数据库引擎支持 time.Time/*time.Time 类型
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if _, ok := value.(time.Time); ok {
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continue
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}
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if _, ok := value.(*time.Time); ok {
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continue
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}
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// 如果执行String方法，那么执行字符串转换
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if s, ok := value.(apiString); ok {
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data[key] = s.String()
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continue
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}
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delete(data, key)
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for k, v := range varToMapDeep(value) {
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data[k] = v
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}
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}
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}
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return data
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}
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// 处理预处理占位符与slice类型的参数。
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// 需要注意的是，
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// 如果是链式操作，在条件参数中也会调用该方法处理查询参数，
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// 如果是方法参数，在sql提交执行之前也会再次调用该方法处理查询语句和参数。
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func handlerSliceArguments(query string, args []interface{}) (newQuery string, newArgs []interface{}) {
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newQuery = query
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// 查询条件参数处理，主要处理slice参数类型
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if len(args) > 0 {
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for index, arg := range args {
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rv := reflect.ValueOf(arg)
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kind := rv.Kind()
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if kind == reflect.Ptr {
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rv = rv.Elem()
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kind = rv.Kind()
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}
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switch kind {
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// '?'占位符支持slice类型, 这里会将slice参数拆散，并更新原有占位符'?'为多个'?'，使用','符号连接。
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case reflect.Slice, reflect.Array:
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// 不拆分[]byte类型(当做字符串处理)
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// Eg: table.Where("name = ?", []byte("john"))
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if _, ok := arg.([]byte); ok {
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newArgs = append(newArgs, arg)
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continue
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}
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for i := 0; i < rv.Len(); i++ {
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newArgs = append(newArgs, rv.Index(i).Interface())
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}
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// 如果参数直接传递slice，并且占位符数量与slice长度相等，
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// 那么不用替换扩展占位符数量，直接使用该slice作为查询参数
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// Eg: db.Query("SELECT ?+?", g.Slice{1, 2})
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if len(args) == 1 && gstr.Count(newQuery, "?") == rv.Len() {
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break
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}
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// counter用于匹配该参数的位置(与index对应)
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counter := 0
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newQuery, _ = gregex.ReplaceStringFunc(`\?`, newQuery, func(s string) string {
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counter++
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if counter == index+1 {
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return "?" + strings.Repeat(",?", rv.Len()-1)
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}
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return s
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})
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default:
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newArgs = append(newArgs, arg)
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}
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}
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}
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return
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}
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// 将预处理参数转换为底层数据库引擎支持的格式。
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// 主要是判断参数是否为复杂数据类型，如果是，那么转换为基础类型。
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func convertParam(value interface{}) interface{} {
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rv := reflect.ValueOf(value)
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kind := rv.Kind()
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if kind == reflect.Ptr {
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rv = rv.Elem()
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kind = rv.Kind()
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}
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switch kind {
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case reflect.Struct:
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// 底层数据库引擎支持 time.Time/*time.Time 类型
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if v, ok := value.(time.Time); ok {
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if v.IsZero() {
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return "null"
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}
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return value
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}
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if v, ok := value.(*time.Time); ok {
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if v.IsZero() {
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return ""
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}
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return value
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}
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return gconv.String(value)
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}
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return value
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}
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// 格式化错误信息
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func formatError(err error, query string, args ...interface{}) error {
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if err != nil && err != sql.ErrNoRows {
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return errors.New(fmt.Sprintf("%s, %s\n", err.Error(), bindArgsToQuery(query, args)))
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}
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return err
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}
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// 根据insert选项获得操作名称
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func getInsertOperationByOption(option int) string {
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operator := "INSERT"
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switch option {
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case gINSERT_OPTION_REPLACE:
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operator = "REPLACE"
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case gINSERT_OPTION_SAVE:
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case gINSERT_OPTION_IGNORE:
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operator = "INSERT IGNORE"
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}
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return operator
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}
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// 将参数绑定到SQL语句中，仅用于调试打印。
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func bindArgsToQuery(query string, args []interface{}) string {
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index := -1
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newQuery, _ := gregex.ReplaceStringFunc(`\?`, query, func(s string) string {
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index++
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if len(args) > index {
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if args[index] == nil {
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return "null"
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}
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rv := reflect.ValueOf(args[index])
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kind := rv.Kind()
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if kind == reflect.Ptr {
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if rv.IsNil() || !rv.IsValid() {
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return "null"
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}
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rv = rv.Elem()
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kind = rv.Kind()
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}
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switch kind {
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case reflect.String, reflect.Map, reflect.Slice, reflect.Array:
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return `'` + gstr.QuoteMeta(gconv.String(args[index]), `'`) + `'`
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case reflect.Struct:
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if t, ok := args[index].(time.Time); ok {
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return `'` + gtime.NewFromTime(t).String() + `'`
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}
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return `'` + gstr.QuoteMeta(gconv.String(args[index]), `'`) + `'`
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}
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return gconv.String(args[index])
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}
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return s
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})
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return newQuery
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}
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// 使用递归的方式将map键值对映射到struct对象上，注意参数<pointer>是一个指向struct的指针。
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func mapToStruct(data map[string]interface{}, pointer interface{}) error {
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return gconv.StructDeep(data, pointer, GetOrmMappingOfStruct(pointer))
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}
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