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62 lines
2.5 KiB
62 lines
2.5 KiB
3 years ago
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package pgx
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import (
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"database/sql/driver"
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"reflect"
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)
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// This file contains code copied from the Go standard library due to the
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// required function not being public.
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// Copyright (c) 2009 The Go Authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// From database/sql/convert.go
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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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// Issue 8415.
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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 function is mirrored in the database/sql/driver 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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