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71 lines
3.7 KiB
71 lines
3.7 KiB
/*
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XOWA: the XOWA Offline Wiki Application
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Copyright (C) 2012 gnosygnu@gmail.com
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package gplx.dbs.sqls; import gplx.*; import gplx.dbs.*;
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import gplx.core.gfo_ndes.*; import gplx.core.type_xtns.*;
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public class Sql_select_fld_ {
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public static Sql_select_fld_base new_fld(String tbl, String fld, String alias) {return new Sql_select_fld_fld(tbl, fld, alias);}
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public static Sql_select_fld_base new_count(String tbl, String fld, String alias) {return new Sql_select_fld_count(tbl, fld, alias);}
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public static Sql_select_fld_base new_sum(String tbl, String fld, String alias) {return new Sql_select_fld_sum(tbl, fld, alias);}
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public static Sql_select_fld_base new_min(String tbl, String fld, String alias) {return new Sql_select_fld_minMax(CompareAble_.Less, tbl, fld, alias);}
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public static Sql_select_fld_base new_max(String tbl, String fld, String alias) {return new Sql_select_fld_minMax(CompareAble_.More, tbl, fld, alias);}
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}
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class Sql_select_fld_fld extends Sql_select_fld_base {
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public Sql_select_fld_fld(String tbl, String fld, String alias) {this.ctor_(tbl, fld, alias);}
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@Override public Object GroupBy_eval(Object groupByVal, Object curVal, ClassXtn type) {return curVal;}
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@Override public void GroupBy_type(GfoFld fld) {this.ValType_set(fld.Type());}
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@Override public String XtoSql() {
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String rv = Fld();
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if (Tbl() != Tbl_null)
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rv = Tbl() + "." + Fld();
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if (!String_.Eq(Alias(), Fld()))
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rv = rv + " AS " + Alias();
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return rv;
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}
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}
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class Sql_select_fld_count extends Sql_select_fld_func_base {
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public Sql_select_fld_count(String tbl, String fld, String alias) {this.ctor_(tbl, fld, alias);}
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@Override public String XtoSql_functionName() {return "COUNT";}
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@Override public void GroupBy_type(GfoFld fld) {this.ValType_set(IntClassXtn.Instance);}
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@Override public Object GroupBy_eval(Object groupByVal, Object curVal, ClassXtn type) {
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if (groupByVal == null) return 1;
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return Int_.cast(groupByVal) + 1;
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}
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}
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class Sql_select_fld_sum extends Sql_select_fld_func_base {
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public Sql_select_fld_sum(String tbl, String fld, String alias) {this.ctor_(tbl, fld, alias);}
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@Override public String XtoSql_functionName() {return "SUM";}
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@Override public void GroupBy_type(GfoFld fld) {this.ValType_set(IntClassXtn.Instance);}
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@Override public Object GroupBy_eval(Object groupByVal, Object curVal, ClassXtn type) {
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if (groupByVal == null) return Int_.cast(curVal);
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return Int_.cast(groupByVal) + Int_.cast(curVal);
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}
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}
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class Sql_select_fld_minMax extends Sql_select_fld_func_base {
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private final int compareType;
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public Sql_select_fld_minMax(int compareType, String tbl, String fld, String alias) {
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this.compareType = compareType;
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this.ctor_(tbl, fld, alias);
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}
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@Override public String XtoSql_functionName() {return compareType == CompareAble_.Less ? "MIN" : "MAX";}
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@Override public Object GroupBy_eval(Object groupByVal, Object curVal, ClassXtn type) {
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if (groupByVal == null) return curVal;
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int compareVal = CompareAble_.Compare_obj(curVal, groupByVal);
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return compareVal * compareType > 0 ? curVal : groupByVal;
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}
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}
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