60 lines
2.3 KiB
Go
60 lines
2.3 KiB
Go
// Copyright 2022 The Xorm Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package statements
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import (
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"fmt"
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"xorm.io/builder"
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)
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// isUsingLegacy returns true if xorm uses legacy LIMIT OFFSET.
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// It's only available in sqlserver and oracle, if param USE_LEGACY_LIMIT_OFFSET is set to "true"
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func (statement *Statement) isUsingLegacyLimitOffset() bool {
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u, ok := statement.dialect.(interface{ UseLegacyLimitOffset() bool })
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return ok && u.UseLegacyLimitOffset()
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}
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func (statement *Statement) writeSelectWithFns(buf *builder.BytesWriter, writeFuncs ...func(*builder.BytesWriter) error) (err error) {
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for _, fn := range writeFuncs {
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if err = fn(buf); err != nil {
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return
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}
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}
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return
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}
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// write mssql legacy query sql
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func (statement *Statement) writeMssqlLegacySelect(buf *builder.BytesWriter, columnStr string) error {
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writeFns := []func(*builder.BytesWriter) error{
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func(bw *builder.BytesWriter) (err error) {
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_, err = fmt.Fprintf(bw, "SELECT")
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return
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},
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func(bw *builder.BytesWriter) error { return statement.writeDistinct(bw) },
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func(bw *builder.BytesWriter) error { return statement.writeTop(bw) },
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statement.writeFrom,
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statement.writeWhereWithMssqlPagination,
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func(bw *builder.BytesWriter) error { return statement.writeGroupBy(bw) },
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func(bw *builder.BytesWriter) error { return statement.writeHaving(bw) },
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func(bw *builder.BytesWriter) error { return statement.writeOrderBys(bw) },
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func(bw *builder.BytesWriter) error { return statement.writeForUpdate(bw) },
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}
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return statement.writeSelectWithFns(buf, writeFns...)
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}
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func (statement *Statement) writeOracleLegacySelect(buf *builder.BytesWriter, columnStr string) error {
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writeFns := []func(*builder.BytesWriter) error{
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func(bw *builder.BytesWriter) error { return statement.writeSelectColumns(bw, columnStr) },
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statement.writeFrom,
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func(bw *builder.BytesWriter) error { return statement.writeOracleLimit(bw, columnStr) },
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func(bw *builder.BytesWriter) error { return statement.writeGroupBy(bw) },
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func(bw *builder.BytesWriter) error { return statement.writeHaving(bw) },
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func(bw *builder.BytesWriter) error { return statement.writeOrderBys(bw) },
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func(bw *builder.BytesWriter) error { return statement.writeForUpdate(bw) },
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}
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return statement.writeSelectWithFns(buf, writeFns...)
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}
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