GoToSocial/vendor/github.com/uptrace/bun/query_merge.go

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2023-01-22 12:26:47 +01:00
package bun
import (
"context"
"database/sql"
"errors"
"github.com/uptrace/bun/dialect"
"github.com/uptrace/bun/dialect/feature"
"github.com/uptrace/bun/internal"
"github.com/uptrace/bun/schema"
)
type MergeQuery struct {
baseQuery
returningQuery
using schema.QueryWithArgs
on schema.QueryWithArgs
when []schema.QueryAppender
}
var _ Query = (*MergeQuery)(nil)
func NewMergeQuery(db *DB) *MergeQuery {
q := &MergeQuery{
baseQuery: baseQuery{
db: db,
conn: db.DB,
},
}
if !(q.db.dialect.Name() == dialect.MSSQL || q.db.dialect.Name() == dialect.PG) {
q.err = errors.New("bun: merge not supported for current dialect")
}
return q
}
func (q *MergeQuery) Conn(db IConn) *MergeQuery {
q.setConn(db)
return q
}
func (q *MergeQuery) Model(model interface{}) *MergeQuery {
q.setModel(model)
return q
}
func (q *MergeQuery) Err(err error) *MergeQuery {
q.setErr(err)
return q
}
// Apply calls the fn passing the MergeQuery as an argument.
func (q *MergeQuery) Apply(fn func(*MergeQuery) *MergeQuery) *MergeQuery {
if fn != nil {
return fn(q)
}
return q
}
func (q *MergeQuery) With(name string, query schema.QueryAppender) *MergeQuery {
q.addWith(name, query, false)
return q
}
func (q *MergeQuery) WithRecursive(name string, query schema.QueryAppender) *MergeQuery {
q.addWith(name, query, true)
return q
}
//------------------------------------------------------------------------------
func (q *MergeQuery) Table(tables ...string) *MergeQuery {
for _, table := range tables {
q.addTable(schema.UnsafeIdent(table))
}
return q
}
func (q *MergeQuery) TableExpr(query string, args ...interface{}) *MergeQuery {
q.addTable(schema.SafeQuery(query, args))
return q
}
func (q *MergeQuery) ModelTableExpr(query string, args ...interface{}) *MergeQuery {
q.modelTableName = schema.SafeQuery(query, args)
return q
}
//------------------------------------------------------------------------------
// Returning adds a RETURNING clause to the query.
//
// To suppress the auto-generated RETURNING clause, use `Returning("NULL")`.
// Only for mssql output, postgres not supported returning in merge query
func (q *MergeQuery) Returning(query string, args ...interface{}) *MergeQuery {
q.addReturning(schema.SafeQuery(query, args))
return q
}
//------------------------------------------------------------------------------
func (q *MergeQuery) Using(s string, args ...interface{}) *MergeQuery {
q.using = schema.SafeQuery(s, args)
return q
}
func (q *MergeQuery) On(s string, args ...interface{}) *MergeQuery {
q.on = schema.SafeQuery(s, args)
return q
}
// WhenInsert for when insert clause.
func (q *MergeQuery) WhenInsert(expr string, fn func(q *InsertQuery) *InsertQuery) *MergeQuery {
sq := NewInsertQuery(q.db)
// apply the model as default into sub query, since appendColumnsValues required
if q.model != nil {
sq = sq.Model(q.model)
}
sq = sq.Apply(fn)
q.when = append(q.when, &whenInsert{expr: expr, query: sq})
return q
}
// WhenUpdate for when update clause.
func (q *MergeQuery) WhenUpdate(expr string, fn func(q *UpdateQuery) *UpdateQuery) *MergeQuery {
sq := NewUpdateQuery(q.db)
// apply the model as default into sub query
if q.model != nil {
sq = sq.Model(q.model)
}
sq = sq.Apply(fn)
q.when = append(q.when, &whenUpdate{expr: expr, query: sq})
return q
}
// WhenDelete for when delete clause.
func (q *MergeQuery) WhenDelete(expr string) *MergeQuery {
q.when = append(q.when, &whenDelete{expr: expr})
return q
}
// When for raw expression clause.
func (q *MergeQuery) When(expr string, args ...interface{}) *MergeQuery {
q.when = append(q.when, schema.SafeQuery(expr, args))
return q
}
//------------------------------------------------------------------------------
func (q *MergeQuery) Operation() string {
return "MERGE"
}
func (q *MergeQuery) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
if q.err != nil {
return nil, q.err
}
fmter = formatterWithModel(fmter, q)
b, err = q.appendWith(fmter, b)
if err != nil {
return nil, err
}
b = append(b, "MERGE "...)
if q.db.dialect.Name() == dialect.PG {
b = append(b, "INTO "...)
}
b, err = q.appendFirstTableWithAlias(fmter, b)
if err != nil {
return nil, err
}
b = append(b, " USING "...)
b, err = q.using.AppendQuery(fmter, b)
if err != nil {
return nil, err
}
b = append(b, " ON "...)
b, err = q.on.AppendQuery(fmter, b)
if err != nil {
return nil, err
}
for _, w := range q.when {
b = append(b, " WHEN "...)
b, err = w.AppendQuery(fmter, b)
if err != nil {
return nil, err
}
}
if q.hasFeature(feature.Output) && q.hasReturning() {
b = append(b, " OUTPUT "...)
b, err = q.appendOutput(fmter, b)
if err != nil {
return nil, err
}
}
// A MERGE statement must be terminated by a semi-colon (;).
b = append(b, ";"...)
return b, nil
}
//------------------------------------------------------------------------------
func (q *MergeQuery) Scan(ctx context.Context, dest ...interface{}) error {
_, err := q.scanOrExec(ctx, dest, true)
return err
}
func (q *MergeQuery) Exec(ctx context.Context, dest ...interface{}) (sql.Result, error) {
return q.scanOrExec(ctx, dest, len(dest) > 0)
}
func (q *MergeQuery) scanOrExec(
ctx context.Context, dest []interface{}, hasDest bool,
) (sql.Result, error) {
if q.err != nil {
return nil, q.err
}
// Run append model hooks before generating the query.
if err := q.beforeAppendModel(ctx, q); err != nil {
return nil, err
}
// Generate the query before checking hasReturning.
queryBytes, err := q.AppendQuery(q.db.fmter, q.db.makeQueryBytes())
if err != nil {
return nil, err
}
useScan := hasDest || (q.hasReturning() && q.hasFeature(feature.InsertReturning|feature.Output))
var model Model
if useScan {
var err error
model, err = q.getModel(dest)
if err != nil {
return nil, err
}
}
query := internal.String(queryBytes)
var res sql.Result
if useScan {
res, err = q.scan(ctx, q, query, model, true)
if err != nil {
return nil, err
}
} else {
res, err = q.exec(ctx, q, query)
if err != nil {
return nil, err
}
}
return res, nil
}
func (q *MergeQuery) String() string {
buf, err := q.AppendQuery(q.db.Formatter(), nil)
if err != nil {
panic(err)
}
return string(buf)
}
//------------------------------------------------------------------------------
type whenInsert struct {
expr string
query *InsertQuery
}
func (w *whenInsert) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
b = append(b, w.expr...)
if w.query != nil {
b = append(b, " THEN INSERT"...)
b, err = w.query.appendColumnsValues(fmter, b, true)
if err != nil {
return nil, err
}
}
return b, nil
}
type whenUpdate struct {
expr string
query *UpdateQuery
}
func (w *whenUpdate) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
b = append(b, w.expr...)
if w.query != nil {
b = append(b, " THEN UPDATE SET "...)
b, err = w.query.appendSet(fmter, b)
if err != nil {
return nil, err
}
}
return b, nil
}
type whenDelete struct {
expr string
}
func (w *whenDelete) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
b = append(b, w.expr...)
b = append(b, " THEN DELETE"...)
return b, nil
}