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