154 lines
3.2 KiB
Go
154 lines
3.2 KiB
Go
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
|
|
//
|
|
// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
|
|
//
|
|
// This Source Code Form is subject to the terms of the Mozilla Public
|
|
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
|
|
// You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
|
|
package mysql
|
|
|
|
import (
|
|
"database/sql/driver"
|
|
"fmt"
|
|
"reflect"
|
|
"strconv"
|
|
)
|
|
|
|
type mysqlStmt struct {
|
|
mc *mysqlConn
|
|
id uint32
|
|
paramCount int
|
|
columns []mysqlField // cached from the first query
|
|
}
|
|
|
|
func (stmt *mysqlStmt) Close() error {
|
|
if stmt.mc == nil || stmt.mc.netConn == nil {
|
|
// driver.Stmt.Close can be called more than once, thus this function
|
|
// has to be idempotent.
|
|
// See also Issue #450 and golang/go#16019.
|
|
//errLog.Print(ErrInvalidConn)
|
|
return driver.ErrBadConn
|
|
}
|
|
|
|
err := stmt.mc.writeCommandPacketUint32(comStmtClose, stmt.id)
|
|
stmt.mc = nil
|
|
return err
|
|
}
|
|
|
|
func (stmt *mysqlStmt) NumInput() int {
|
|
return stmt.paramCount
|
|
}
|
|
|
|
func (stmt *mysqlStmt) ColumnConverter(idx int) driver.ValueConverter {
|
|
return converter{}
|
|
}
|
|
|
|
func (stmt *mysqlStmt) Exec(args []driver.Value) (driver.Result, error) {
|
|
if stmt.mc.netConn == nil {
|
|
errLog.Print(ErrInvalidConn)
|
|
return nil, driver.ErrBadConn
|
|
}
|
|
// Send command
|
|
err := stmt.writeExecutePacket(args)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
mc := stmt.mc
|
|
|
|
mc.affectedRows = 0
|
|
mc.insertId = 0
|
|
|
|
// Read Result
|
|
resLen, err := mc.readResultSetHeaderPacket()
|
|
if err == nil {
|
|
if resLen > 0 {
|
|
// Columns
|
|
err = mc.readUntilEOF()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Rows
|
|
err = mc.readUntilEOF()
|
|
}
|
|
if err == nil {
|
|
return &mysqlResult{
|
|
affectedRows: int64(mc.affectedRows),
|
|
insertId: int64(mc.insertId),
|
|
}, nil
|
|
}
|
|
}
|
|
|
|
return nil, err
|
|
}
|
|
|
|
func (stmt *mysqlStmt) Query(args []driver.Value) (driver.Rows, error) {
|
|
if stmt.mc.netConn == nil {
|
|
errLog.Print(ErrInvalidConn)
|
|
return nil, driver.ErrBadConn
|
|
}
|
|
// Send command
|
|
err := stmt.writeExecutePacket(args)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
mc := stmt.mc
|
|
|
|
// Read Result
|
|
resLen, err := mc.readResultSetHeaderPacket()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
rows := new(binaryRows)
|
|
|
|
if resLen > 0 {
|
|
rows.mc = mc
|
|
// Columns
|
|
// If not cached, read them and cache them
|
|
if stmt.columns == nil {
|
|
rows.columns, err = mc.readColumns(resLen)
|
|
stmt.columns = rows.columns
|
|
} else {
|
|
rows.columns = stmt.columns
|
|
err = mc.readUntilEOF()
|
|
}
|
|
}
|
|
|
|
return rows, err
|
|
}
|
|
|
|
type converter struct{}
|
|
|
|
func (c converter) ConvertValue(v interface{}) (driver.Value, error) {
|
|
if driver.IsValue(v) {
|
|
return v, nil
|
|
}
|
|
|
|
rv := reflect.ValueOf(v)
|
|
switch rv.Kind() {
|
|
case reflect.Ptr:
|
|
// indirect pointers
|
|
if rv.IsNil() {
|
|
return nil, nil
|
|
}
|
|
return c.ConvertValue(rv.Elem().Interface())
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
return rv.Int(), nil
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32:
|
|
return int64(rv.Uint()), nil
|
|
case reflect.Uint64:
|
|
u64 := rv.Uint()
|
|
if u64 >= 1<<63 {
|
|
return strconv.FormatUint(u64, 10), nil
|
|
}
|
|
return int64(u64), nil
|
|
case reflect.Float32, reflect.Float64:
|
|
return rv.Float(), nil
|
|
}
|
|
return nil, fmt.Errorf("unsupported type %T, a %s", v, rv.Kind())
|
|
}
|