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package bun
import (
"context"
"database/sql"
"fmt"
"github.com/uptrace/bun/internal"
"github.com/uptrace/bun/schema"
)
type DropColumnQuery struct {
baseQuery
}
var _ Query = (*DropColumnQuery)(nil)
func NewDropColumnQuery(db *DB) *DropColumnQuery {
q := &DropColumnQuery{
baseQuery: baseQuery{
db: db,
conn: db.DB,
},
}
return q
}
func (q *DropColumnQuery) Conn(db IConn) *DropColumnQuery {
q.setConn(db)
return q
}
func (q *DropColumnQuery) Model(model interface{}) *DropColumnQuery {
q.setModel(model)
return q
}
//------------------------------------------------------------------------------
func (q *DropColumnQuery) Table(tables ...string) *DropColumnQuery {
for _, table := range tables {
q.addTable(schema.UnsafeIdent(table))
}
return q
}
func (q *DropColumnQuery) TableExpr(query string, args ...interface{}) *DropColumnQuery {
q.addTable(schema.SafeQuery(query, args))
return q
}
func (q *DropColumnQuery) ModelTableExpr(query string, args ...interface{}) *DropColumnQuery {
q.modelTableName = schema.SafeQuery(query, args)
return q
}
//------------------------------------------------------------------------------
func (q *DropColumnQuery) Column(columns ...string) *DropColumnQuery {
for _, column := range columns {
q.addColumn(schema.UnsafeIdent(column))
}
return q
}
func (q *DropColumnQuery) ColumnExpr(query string, args ...interface{}) *DropColumnQuery {
q.addColumn(schema.SafeQuery(query, args))
return q
}
//------------------------------------------------------------------------------
func (q *DropColumnQuery) Operation() string {
return "DROP COLUMN"
}
func (q *DropColumnQuery) AppendQuery(fmter schema.Formatter, b []byte) (_ []byte, err error) {
if q.err != nil {
return nil, q.err
}
if len(q.columns) != 1 {
return nil, fmt.Errorf("bun: DropColumnQuery requires exactly one column")
}
b = append(b, "ALTER TABLE "...)
b, err = q.appendFirstTable(fmter, b)
if err != nil {
return nil, err
}
b = append(b, " DROP COLUMN "...)
b, err = q.columns[0].AppendQuery(fmter, b)
if err != nil {
return nil, err
}
return b, nil
}
//------------------------------------------------------------------------------
func (q *DropColumnQuery) Exec(ctx context.Context, dest ...interface{}) (sql.Result, error) {
queryBytes, err := q.AppendQuery(q.db.fmter, q.db.makeQueryBytes())
if err != nil {
return nil, err
}
query := internal.String(queryBytes)
res, err := q.exec(ctx, q, query)
if err != nil {
return nil, err
}
return res, nil
}
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