mirror of
https://github.com/querydsl/querydsl.git
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79 lines
2.6 KiB
Java
79 lines
2.6 KiB
Java
/*
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* Copyright 2011, Mysema Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.mysema.query.sql;
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import com.mysema.query.QueryMetadata;
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import com.mysema.query.QueryModifiers;
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import com.mysema.query.types.Ops;
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/**
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* DerbyTemplates is an SQL dialect for Derby
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*
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* @author tiwe
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*
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*/
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public class DerbyTemplates extends SQLTemplates {
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private String limitOffsetTemplate = "\noffset {1s} rows fetch next {0s} rows only";
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private String limitTemplate = "\nfetch first {0s} rows only";
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private String offsetTemplate = "\noffset {0s} rows";
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public DerbyTemplates() {
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this('\\',false);
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}
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public DerbyTemplates(boolean quote) {
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this('\\',quote);
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}
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public DerbyTemplates(char escape, boolean quote) {
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super("\"", escape, quote);
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setDummyTable("sysibm.sysdummy1");
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addClass2TypeMappings("smallint", Byte.class);
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setAutoIncrement(" generated always as identity");
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add(Ops.CONCAT, "varchar({0} || {1})");
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add(Ops.DateTimeOps.DAY_OF_MONTH, "day({0})");
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add(NEXTVAL, "next value for {0s}");
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// case for eq
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add(Ops.CASE_EQ, "case {1} end");
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add(Ops.CASE_EQ_WHEN, "when {0} = {1} then {2} {3}");
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add(Ops.CASE_EQ_ELSE, "else {0}");
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add(Ops.MathOps.ROUND, "floor({0})"); // FIXME
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add(Ops.MathOps.POWER, "exp({1} * log({0}))");
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add(Ops.MathOps.LN, "log({0})");
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add(Ops.MathOps.LOG, "(log({0}) / log({1}))");
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add(Ops.MathOps.COTH, "(exp({0} * 2) + 1) / (exp({0} * 2) - 1)");
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// add(Ops.DateTimeOps.DATE_ADD, "date_add({0}, INTERVAL {1} {2s})");
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}
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protected void serializeModifiers(QueryMetadata metadata, SerializationContext context) {
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QueryModifiers mod = metadata.getModifiers();
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if (mod.getLimit() == null) {
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context.handle(offsetTemplate, mod.getOffset());
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}else if (mod.getOffset() == null) {
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context.handle(limitTemplate, mod.getLimit());
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} else {
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context.handle(limitOffsetTemplate, mod.getLimit(), mod.getOffset());
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}
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}
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}
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