forked from uber/athenadriver
/
statement.go
88 lines (80 loc) · 2.79 KB
/
statement.go
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// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package athenadriver
import (
"context"
"database/sql/driver"
"strings"
)
// Statement is to implement Go's database/sql Statement.
type Statement struct {
connection *Connection
closed bool
query string
numInput int
}
// Close is to close an open statement.
func (s *Statement) Close() error {
if s.connection == nil || s.closed {
// driver.Stmt.Close can be called more than once, thus this function
// has to be idempotent.
// See also Issue #450 and golang/go#16019.
return driver.ErrBadConn
}
s.query = ""
s.closed = true
s.numInput = 0
return nil
}
// NumInput returns the number of prepared arguments.
// It may also return -1, if the driver doesn't know
// its number of placeholders. In that case, the sql package
// will not sanity check Exec or Query argument counts.
// -- From Go `sql/driver`
func (s *Statement) NumInput() int {
if s.numInput == 0 {
s.numInput = strings.Count(s.query, "?")
}
return s.numInput
}
// ColumnConverter is to return driver's DefaultParameterConverter.
func (s *Statement) ColumnConverter(idx int) driver.ValueConverter {
return driver.DefaultParameterConverter
}
// Exec is to execute a prepared statement.
func (s *Statement) Exec(args []driver.Value) (driver.Result, error) {
if s.closed {
return nil, driver.ErrBadConn
}
r, e := s.connection.ExecContext(context.Background(), s.query,
valueToNamedValue(args))
s.closed = true
return r, e
}
// Query is to query based on a prepared statement.
func (s *Statement) Query(args []driver.Value) (driver.Rows, error) {
if s.closed {
return nil, driver.ErrBadConn
}
r, e := s.connection.QueryContext(context.Background(), s.query,
valueToNamedValue(args))
s.closed = true
return r, e
}