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insert.go
178 lines (156 loc) · 3.39 KB
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insert.go
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package lorm
import (
"context"
"github.com/Ai-feier/lorm/internal/errs"
"github.com/Ai-feier/lorm/model"
)
type UpsertBuilder[T any] struct {
i *Inserter[T]
conflictColumns []string
}
type Upsert struct {
conflictColumns []string
assigns []Assignable
}
func (o *UpsertBuilder[T]) ConflictColumns(cols ...string) *UpsertBuilder[T] {
o.conflictColumns = cols
return o
}
// Update 也可以看做是一个终结方法,重新回到 Inserter 里面
func (o *UpsertBuilder[T]) Update(assigns ...Assignable) *Inserter[T] {
o.i.upsert = &Upsert{
conflictColumns: o.conflictColumns,
assigns: assigns,
}
return o.i
}
type Inserter[T any] struct {
builder
values []*T
db *DB
columns []string
upsert *Upsert
}
func (i *Inserter[T]) Exec(ctx context.Context) Result {
//q, err := i.Build()
//if err != nil {
// return Result{err: err}
//}
//res, err := i.db.execContext(ctx, q.SQL, q.Args...)
//return Result{res: res, err: err}
handler := i.execHandler
mdls := i.db.mdls
for j:=len(mdls)-1;j>=0;j-- {
handler = mdls[j](handler)
}
qc := &QueryContext{
Builder: i,
Type: "INSERT",
Model: i.model,
}
qr := handler(ctx, qc)
return qr.Result.(Result)
}
func (i *Inserter[T]) execHandler(ctx context.Context, qc *QueryContext) *QueryResult {
q, err := i.Build()
if err != nil {
return &QueryResult{
Result: Result{err: err},
}
}
res, err := i.db.execContext(ctx, q.SQL, q.Args...)
return &QueryResult{
Result: Result{res: res, err: err},
}
}
func NewInserter[T any](db *DB) *Inserter[T] {
return &Inserter[T]{
db: db,
builder: builder{
dialect: db.dialect,
quoter: db.dialect.quoter(),
r: db.r,
},
}
}
func (i *Inserter[T]) Values(vals ...*T) *Inserter[T] {
i.values = vals
return i
}
func (i *Inserter[T]) OnDuplicateKey() *UpsertBuilder[T] {
return &UpsertBuilder[T]{
i: i,
}
}
// Fields 指定要插入的列
func (i *Inserter[T]) Columns(cols ...string) *Inserter[T] {
i.columns = cols
return i
}
func (i *Inserter[T]) Build() (*Query, error) {
defer func() {
i.sb.Reset()
}()
if len(i.values) == 0 {
return nil, errs.ErrInsertZeroRow
}
m, err := i.db.r.Get(i.values[0])
if err != nil {
return nil, err
}
i.model = m
i.sb.WriteString("INSERT INTO ")
i.quote(m.TableName)
i.sb.WriteString("(")
// 插入字段
fields := m.Fields
if len(i.columns) != 0 {
fields = make([]*model.Field, 0, len(i.columns))
for _, c := range i.columns {
field, ok := m.FieldMap[c]
if !ok {
return nil, errs.NewErrUnknownField(c)
}
fields = append(fields, field)
}
}
// (len(i.values) + 1) 中 +1 是考虑到 UPSERT 语句会传递额外的参数
i.args = make([]any, 0, len(fields)*(len(i.values)+1))
for idx, fd := range fields {
if idx > 0 {
i.sb.WriteByte(',')
}
i.quote(fd.ColName)
}
i.sb.WriteString(") VALUES")
for vIdx, val := range i.values {
if vIdx > 0 {
i.sb.WriteByte(',')
}
refVal := i.db.valCreator(val, i.model)
i.sb.WriteByte('(')
for fIdx, field := range fields {
if fIdx > 0 {
i.sb.WriteByte(',')
}
i.sb.WriteByte('?')
fdVal, err := refVal.Field(field.GoName)
if err != nil {
return nil, err
}
i.addArgs(fdVal)
}
i.sb.WriteByte(')')
}
if i.upsert != nil {
err = i.dialect.buildUpsert(&i.builder, i.upsert)
if err != nil {
return nil, err
}
}
i.sb.WriteString(";")
return &Query{
SQL: i.sb.String(),
Args: i.args,
}, nil
}