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update.go
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update.go
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package orm
import (
"errors"
"gopkg.in/pg.v4/types"
)
func Update(db dber, v interface{}) error {
q := NewQuery(db, v)
if q.err != nil {
return q.err
}
_, err := db.ExecOne(updateModel{q}, q.model)
return err
}
type updateModel struct {
*Query
}
var _ QueryAppender = (*updateModel)(nil)
func (upd updateModel) AppendQuery(b []byte, params ...interface{}) ([]byte, error) {
table := upd.model.Table()
strct := upd.model.Value()
for _, pk := range table.PKs {
if pk.IsEmpty(strct) {
return nil, errors.New("pg: primary key is empty")
}
}
b = append(b, "UPDATE "...)
b = append(b, upd.tableName...)
b = append(b, " SET "...)
if len(upd.fields) > 0 {
for i, fieldName := range upd.fields {
field, err := table.GetField(fieldName)
if err != nil {
return nil, err
}
b = append(b, field.ColName...)
b = append(b, " = "...)
b = field.AppendValue(b, strct, 1)
if i != len(upd.fields)-1 {
b = append(b, ", "...)
}
}
} else {
start := len(b)
for _, field := range table.Fields {
if field.Has(PrimaryKeyFlag) {
continue
}
b = append(b, field.ColName...)
b = append(b, " = "...)
b = field.AppendValue(b, strct, 1)
b = append(b, ", "...)
}
if len(b) > start {
b = b[:len(b)-2]
}
}
b = append(b, " WHERE "...)
b = appendFieldValue(b, strct, table.PKs)
if len(upd.returning) > 0 {
b = append(b, " RETURNING "...)
b = append(b, upd.returning...)
}
return b, nil
}
type updateQuery struct {
*Query
data map[string]interface{}
}
var _ QueryAppender = (*updateQuery)(nil)
func (upd updateQuery) AppendQuery(b []byte, params ...interface{}) ([]byte, error) {
b = append(b, "UPDATE "...)
b = append(b, upd.tableName...)
b = append(b, " SET "...)
for fieldName, value := range upd.data {
b = types.AppendField(b, fieldName, 1)
b = append(b, " = "...)
b = types.Append(b, value, 1)
b = append(b, ", "...)
}
if len(upd.data) > 0 {
b = b[:len(b)-2]
}
b = append(b, " WHERE "...)
b = append(b, upd.where...)
if len(upd.returning) > 0 {
b = append(b, " RETURNING "...)
b = append(b, upd.returning...)
}
return b, nil
}