mirror of
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Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
205 lines
4.8 KiB
Go
Vendored
205 lines
4.8 KiB
Go
Vendored
// 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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"io"
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"reflect"
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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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}
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func (stmt *mysqlStmt) Close() error {
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if stmt.mc == nil || stmt.mc.closed.IsSet() {
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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.closed.IsSet() {
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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, stmt.mc.markBadConn(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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return nil, err
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}
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if resLen > 0 {
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// Columns
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if err = mc.readUntilEOF(); err != nil {
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return nil, err
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}
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// Rows
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if err := mc.readUntilEOF(); err != nil {
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return nil, err
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}
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}
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if err := mc.discardResults(); err != nil {
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return nil, err
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}
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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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func (stmt *mysqlStmt) Query(args []driver.Value) (driver.Rows, error) {
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return stmt.query(args)
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}
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func (stmt *mysqlStmt) query(args []driver.Value) (*binaryRows, error) {
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if stmt.mc.closed.IsSet() {
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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, stmt.mc.markBadConn(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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rows.rs.columns, err = mc.readColumns(resLen)
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} else {
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rows.rs.done = true
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switch err := rows.NextResultSet(); err {
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case nil, io.EOF:
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return rows, nil
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default:
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return nil, err
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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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// ConvertValue mirrors the reference/default converter in database/sql/driver
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// with _one_ exception. We support uint64 with their high bit and the default
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// implementation does not. This function should be kept in sync with
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// database/sql/driver defaultConverter.ConvertValue() except for that
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// deliberate difference.
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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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if vr, ok := v.(driver.Valuer); ok {
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sv, err := callValuerValue(vr)
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if err != nil {
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return nil, err
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}
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if !driver.IsValue(sv) {
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return nil, fmt.Errorf("non-Value type %T returned from Value", sv)
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}
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return sv, 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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} else {
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return c.ConvertValue(rv.Elem().Interface())
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}
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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, reflect.Uint64:
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return rv.Uint(), nil
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case reflect.Float32, reflect.Float64:
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return rv.Float(), nil
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case reflect.Bool:
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return rv.Bool(), nil
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case reflect.Slice:
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ek := rv.Type().Elem().Kind()
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if ek == reflect.Uint8 {
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return rv.Bytes(), nil
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}
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return nil, fmt.Errorf("unsupported type %T, a slice of %s", v, ek)
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case reflect.String:
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return rv.String(), 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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var valuerReflectType = reflect.TypeOf((*driver.Valuer)(nil)).Elem()
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// callValuerValue returns vr.Value(), with one exception:
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// If vr.Value is an auto-generated method on a pointer type and the
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// pointer is nil, it would panic at runtime in the panicwrap
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// method. Treat it like nil instead.
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//
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// This is so people can implement driver.Value on value types and
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// still use nil pointers to those types to mean nil/NULL, just like
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// string/*string.
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//
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// This is an exact copy of the same-named unexported function from the
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// database/sql package.
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func callValuerValue(vr driver.Valuer) (v driver.Value, err error) {
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if rv := reflect.ValueOf(vr); rv.Kind() == reflect.Ptr &&
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rv.IsNil() &&
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rv.Type().Elem().Implements(valuerReflectType) {
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return nil, nil
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}
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return vr.Value()
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}
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