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dao.go
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dao.go
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package mysqlx
import (
"database/sql"
"fmt"
"github.com/chenxinqun/ginWarpPkg/datax/pagex"
"github.com/chenxinqun/ginWarpPkg/errno"
"github.com/pkg/errors"
"gorm.io/gorm"
"math"
"reflect"
"strings"
)
// err 常量
const (
CreateErrStr = "create error"
UpdatesErrStr = "updates error"
DeleteErrStr = "delete error"
)
// 查询常量
const (
DescStr = "DESC"
AscStr = "ASC"
InStr = "IN"
NotInStr = "NOT IN"
)
func NewQueryBuilder(model interface{}, mustBeField ...string) *QueryBuilder {
/*
model 要传进来一个结构体的指针.
传进来的model, 一定要有 gorm:"column:id" 这样的tag
否则的话, 所有的查询条件都无法执行.
这样做的目的是为了严格校验查询的字段, 防止SQL注入.
mustBeField 如果传了, 则会校验. 所有的查询条件中, 缺少这个查询条件, 则会抛出异常.
*/
filedSet := make(map[string]struct{})
typeOf := reflect.TypeOf(model).Elem()
for i := 0; i < typeOf.NumField(); i++ {
tag := typeOf.Field(i).Tag.Get("gorm")
if len(tag) > 0 {
tagList := strings.Split(tag, " ")
for _, t := range tagList {
if strings.HasPrefix(t, "column:") {
field := strings.Split(t, ":")[1]
field = strings.Split(field, ",")[0]
field = strings.Split(field, ";")[0]
if len(field) > 0 {
filedSet[strings.TrimSpace(field)] = struct{}{}
}
}
}
}
}
if len(filedSet) == 0 {
panic(errno.NewError("没有传入fields变量, 或者model中没有定义 grom:\"column:filed\" tag"))
}
mustMap := make(map[string]bool)
for _, filed := range mustBeField {
mustMap[strings.TrimSpace(filed)] = false
}
ret := new(QueryBuilder)
ret.model = model
ret.filedSet = filedSet
ret.mustBeField = mustMap
return ret
}
type QueryBuilder struct {
limit int
offset int
mustBeField map[string]bool
order []string
group []string
where []struct {
prefix string
value interface{}
}
filedSet map[string]struct{}
model interface{}
}
func (qb *QueryBuilder) Transaction(db *gorm.DB, fc func(tx *gorm.DB) error, opts ...*sql.TxOptions) (err error) {
return db.Transaction(fc, opts...)
}
func (qb *QueryBuilder) Create(db *gorm.DB, model interface{}) (rowsAffected int64, err error) {
tx := db.Create(model)
rowsAffected = tx.RowsAffected
if err = tx.Error; err != nil {
return rowsAffected, errno.Wrap(err, CreateErrStr)
}
return rowsAffected, nil
}
func (qb *QueryBuilder) Updates(db *gorm.DB, m map[string]interface{}) (rowsAffected int64, err error) {
db = qb.buildModel(db)
tx := qb.buildWhere(db).Updates(m)
rowsAffected = tx.RowsAffected
if err = tx.Error; err != nil {
return rowsAffected, errno.Wrap(err, UpdatesErrStr)
}
return rowsAffected, nil
}
func (qb *QueryBuilder) Delete(db *gorm.DB) (rowsAffected int64, err error) {
// 至少有一个查询条件才允许删除
if len(qb.where) > 0 {
tx := qb.buildWhere(db).Delete(qb.model)
rowsAffected = tx.RowsAffected
if err = tx.Error; err != nil {
return rowsAffected, errno.Wrap(err, DeleteErrStr)
}
}
return rowsAffected, nil
}
func (qb *QueryBuilder) Count(db *gorm.DB) (int64, error) {
var c int64
err := qb.buildQuery(db).Count(&c).Error
if err != nil {
c = 0
}
if errors.Is(err, gorm.ErrRecordNotFound) {
err = nil
}
return c, err
}
func (qb *QueryBuilder) Exist(db *gorm.DB) (bool, error) {
var c int64
c, err := qb.Count(db)
return c > 0, err
}
func (qb *QueryBuilder) Page(db *gorm.DB, val interface{}, param *pagex.Params) (*pagex.Result, error) {
if param == nil {
param = pagex.DefaultPageOption()
}
if param.PageSize == 0 {
param.PageSize = pagex.DefaultPageOption().PageSize
}
if param.CurrentPage == 0 {
param.CurrentPage = pagex.DefaultPageOption().CurrentPage
}
// 统计总数
totalSize, err := qb.Count(db)
if err != nil {
return nil, err
}
// 如果传了all=true, 则设当前页为第一页,分页大小为数据总量. 查询所有(与list等效)
if param.All {
param.PageSize = int(totalSize)
param.CurrentPage = 1
}
var (
pageSize = param.PageSize
currentPage = param.CurrentPage
sortField = param.SortField
sortType = param.SortType
)
// 总数为0时
if totalSize == 0 {
ret := &pagex.Result{
Total: 0,
TotalPage: 0,
PageSize: pageSize,
CurrentPage: currentPage,
CurrentSize: 0,
}
return ret, nil
}
// 计算总页码
p := float64(totalSize) / float64(pageSize)
totalPage := int(math.Ceil(p))
// 计算当前页大小
currentSize := pageSize
if totalSize == 0 {
currentSize = 0
} else {
if currentPage == totalPage {
currentSize = int(totalSize - int64(pageSize*(totalPage-1)))
}
}
if len(sortField) > 0 {
for i, field := range sortField {
if _, ok := qb.filedSet[field]; ok {
qb.OrderBy(field, sortType[i])
}
}
}
qb.Limit(pageSize)
offset := (currentPage - 1) * pageSize
qb.Offset(offset)
pageData := &pageDataObj{
total: int(totalSize),
totalPage: totalPage,
pageSize: pageSize,
currentPage: currentPage,
currentSize: currentSize,
result: qb.buildQuery(db),
}
ret, err := pagex.ConvertResult(pageData, val)
return ret, err
}
func (qb *QueryBuilder) First(db *gorm.DB, ret interface{}) error {
err := qb.buildQuery(db).First(ret).Error
return err
}
func (qb *QueryBuilder) Get(db *gorm.DB, ret interface{}) error {
return qb.First(db, ret)
}
func (qb *QueryBuilder) List(db *gorm.DB, ret interface{}) error {
err := qb.buildQuery(db).Find(ret).Error
return err
}
func (qb *QueryBuilder) SetModel(model interface{}) {
qb.model = model
}
func (qb *QueryBuilder) BuildQuery(db *gorm.DB) *gorm.DB {
ret := db
ret = qb.buildModel(ret)
ret = qb.buildWhere(ret)
ret = qb.buildOrder(ret)
ret = qb.buildGroup(ret)
ret = qb.buildLimit(ret)
return ret
}
func (qb *QueryBuilder) buildQuery(db *gorm.DB) *gorm.DB {
ret := db
ret = qb.buildModel(ret)
ret = qb.buildWhere(ret)
ret = qb.buildOrder(ret)
ret = qb.buildGroup(ret)
ret = qb.buildLimit(ret)
return ret
}
func (qb *QueryBuilder) buildModel(db *gorm.DB) *gorm.DB {
ret := db.Model(qb.model)
return ret
}
func (qb *QueryBuilder) buildWhere(db *gorm.DB) *gorm.DB {
ret := db
for _, where := range qb.where {
filed := strings.TrimSpace(strings.Split(where.prefix, " ")[0])
if _, ok := qb.mustBeField[filed]; ok {
qb.mustBeField[filed] = true
}
ret = ret.Where(where.prefix, where.value)
}
qualified := true
k := ""
for key, value := range qb.mustBeField {
if !value {
qualified = false
k = key
}
}
if !qualified {
panic(errno.Errorf("where条件中缺少必传字段 \"%s\"", k))
}
return ret
}
func (qb *QueryBuilder) buildOrder(db *gorm.DB) *gorm.DB {
ret := db
for _, order := range qb.order {
ret = ret.Order(order)
}
return ret
}
func (qb *QueryBuilder) buildGroup(db *gorm.DB) *gorm.DB {
ret := db
for _, group := range qb.group {
ret = ret.Group(group)
}
return ret
}
func (qb *QueryBuilder) buildLimit(db *gorm.DB) *gorm.DB {
ret := db
ret = ret.Limit(qb.limit).Offset(qb.offset)
return ret
}
func (qb *QueryBuilder) Limit(limit int) *QueryBuilder {
qb.limit = limit
return qb
}
func (qb *QueryBuilder) Offset(offset int) *QueryBuilder {
qb.offset = offset
return qb
}
func (qb *QueryBuilder) Where(p Predicate, field string, value interface{}) *QueryBuilder {
// 校验字段是否存在, 如果不存在, 则直接返回
if _, ok := qb.filedSet[field]; !ok {
return qb
}
qb.where = append(qb.where, struct {
prefix string
value interface{}
}{
fmt.Sprintf("%v %v ?", field, p),
value,
})
return qb
}
func (qb *QueryBuilder) WhereIn(field string, value interface{}) *QueryBuilder {
// 校验字段是否存在, 如果不存在, 则直接返回
if _, ok := qb.filedSet[field]; !ok {
return qb
}
qb.where = append(qb.where, struct {
prefix string
value interface{}
}{
fmt.Sprintf("%v %v ?", field, InStr),
value,
})
return qb
}
func (qb *QueryBuilder) WhereNotIn(field string, value interface{}) *QueryBuilder {
// 校验字段是否存在, 如果不存在, 则直接返回
if _, ok := qb.filedSet[field]; !ok {
return qb
}
qb.where = append(qb.where, struct {
prefix string
value interface{}
}{
fmt.Sprintf("%v %v ?", field, NotInStr),
value,
})
return qb
}
func (qb *QueryBuilder) OrderBy(field string, sortType pagex.SortType) *QueryBuilder {
// 校验字段是否存在, 如果不存在, 则直接返回
if _, ok := qb.filedSet[field]; !ok {
return qb
}
order := AscStr
switch sortType {
case pagex.SortDesc:
order = DescStr
}
qb.order = append(qb.order, field+" "+order)
return qb
}
func (qb *QueryBuilder) GroupBy(field string) *QueryBuilder {
// 校验字段是否存在, 如果不存在, 则直接返回
if _, ok := qb.filedSet[field]; !ok {
return qb
}
qb.order = append(qb.group, field)
return qb
}