feat: add ArithmeticQueryColumn and fixed #35

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/ArithmeticQueryColumn.java

@@ -0,0 +1,133 @@
+/**
+ * Copyright (c) 2022-2023, Mybatis-Flex (fuhai999@gmail.com).
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.mybatisflex.core.query;
+
+import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.util.StringUtil;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ArithmeticQueryColumn extends QueryColumn {
+
+    private List<ArithmeticInfo> arithmeticInfos;
+
+    public ArithmeticQueryColumn(Object value) {
+        arithmeticInfos = new ArrayList<>();
+        arithmeticInfos.add(new ArithmeticInfo(value));
+    }
+
+    @Override
+    public QueryColumn add(QueryColumn queryColumn) {
+        arithmeticInfos.add(new ArithmeticInfo(" + ", queryColumn));
+        return this;
+    }
+
+    @Override
+    public QueryColumn add(Number number) {
+        arithmeticInfos.add(new ArithmeticInfo(" + ", number));
+        return this;
+    }
+
+    @Override
+    public QueryColumn subtract(QueryColumn queryColumn) {
+        arithmeticInfos.add(new ArithmeticInfo(" - ", queryColumn));
+        return this;
+    }
+
+    @Override
+    public QueryColumn subtract(Number number) {
+        arithmeticInfos.add(new ArithmeticInfo(" - ", number));
+        return this;
+    }
+
+    @Override
+    public QueryColumn multiply(QueryColumn queryColumn) {
+        arithmeticInfos.add(new ArithmeticInfo(" * ", queryColumn));
+        return this;
+    }
+
+    @Override
+    public QueryColumn multiply(Number number) {
+        arithmeticInfos.add(new ArithmeticInfo(" * ", number));
+        return this;
+    }
+
+    @Override
+    public QueryColumn divide(QueryColumn queryColumn) {
+        arithmeticInfos.add(new ArithmeticInfo(" / ", queryColumn));
+        return this;
+    }
+
+    @Override
+    public QueryColumn divide(Number number) {
+        arithmeticInfos.add(new ArithmeticInfo(" / ", number));
+        return this;
+    }
+
+    @Override
+    public QueryColumn as(String alias) {
+        this.alias = alias;
+        return this;
+    }
+
+    @Override
+    String toSelectSql(List<QueryTable> queryTables, IDialect dialect) {
+        StringBuilder sql = new StringBuilder();
+        for (int i = 0; i < arithmeticInfos.size(); i++) {
+            sql.append(arithmeticInfos.get(i).toSql(queryTables, dialect, i));
+        }
+        if (StringUtil.isNotBlank(alias)) {
+            return "(" + sql + ") AS " + dialect.wrap(alias);
+        }
+        return sql.toString();
+    }
+
+
+    @Override
+    String toConditionSql(List<QueryTable> queryTables, IDialect dialect) {
+        StringBuilder sql = new StringBuilder();
+        for (int i = 0; i < arithmeticInfos.size(); i++) {
+            sql.append(arithmeticInfos.get(i).toSql(queryTables, dialect, i));
+        }
+        return "(" + sql + ")";
+    }
+
+
+    static class ArithmeticInfo {
+        private String symbol;
+        private Object value;
+
+        public ArithmeticInfo(Object value) {
+            this.value = value;
+        }
+
+        public ArithmeticInfo(String symbol, Object value) {
+            this.symbol = symbol;
+            this.value = value;
+        }
+
+        private String toSql(List<QueryTable> queryTables, IDialect dialect, int index) {
+            String valueSql;
+            if (value instanceof QueryColumn) {
+                valueSql = ((QueryColumn) value).toConditionSql(queryTables, dialect);
+            } else {
+                valueSql = String.valueOf(value);
+            }
+            return index == 0 ? valueSql : symbol  + valueSql;
+        }
+    }
+}

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/QueryColumn.java

@@ -324,6 +324,40 @@ public class QueryColumn implements Serializable {
     }
 
 
+    // 运算 加减乘除 + - * /
+    public QueryColumn add(QueryColumn queryColumn) {
+        return new ArithmeticQueryColumn(this).add(queryColumn);
+    }
+
+    public QueryColumn add(Number number) {
+        return new ArithmeticQueryColumn(this).add(number);
+    }
+
+    public QueryColumn subtract(QueryColumn queryColumn) {
+        return new ArithmeticQueryColumn(this).subtract(queryColumn);
+    }
+
+    public QueryColumn subtract(Number number) {
+        return new ArithmeticQueryColumn(this).subtract(number);
+    }
+
+    public QueryColumn multiply(QueryColumn queryColumn) {
+        return new ArithmeticQueryColumn(this).multiply(queryColumn);
+    }
+
+    public QueryColumn multiply(Number number) {
+        return new ArithmeticQueryColumn(this).multiply(number);
+    }
+
+    public QueryColumn divide(QueryColumn queryColumn) {
+        return new ArithmeticQueryColumn(this).divide(queryColumn);
+    }
+
+    public QueryColumn divide(Number number) {
+        return new ArithmeticQueryColumn(this).divide(number);
+    }
+
+
     protected String wrap(IDialect dialect, String table, String column) {
         if (StringUtil.isNotBlank(table)) {
             return dialect.wrap(table) + "." + dialect.wrap(column);

mybatis-flex-core/src/test/java/com/mybatisflex/coretest/query/ArithmeticQueryColumnTest.java

@@ -0,0 +1,135 @@
+/**
+ * Copyright (c) 2022-2023, Mybatis-Flex (fuhai999@gmail.com).
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.mybatisflex.coretest.query;
+
+import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.dialect.impl.CommonsDialectImpl;
+import com.mybatisflex.core.query.QueryWrapper;
+import org.junit.Assert;
+import org.junit.Test;
+
+import static com.mybatisflex.coretest.table.AccountTableDef.ACCOUNT;
+
+public class ArithmeticQueryColumnTest {
+
+    private static String toSql(QueryWrapper queryWrapper){
+        IDialect dialect = new CommonsDialectImpl();
+        return dialect.forSelectByQuery(queryWrapper);
+    }
+
+
+    @Test
+    public void testAdd() {
+        QueryWrapper query = new QueryWrapper()
+                .select(ACCOUNT.ID.add(100).as("x100"))
+                .from(ACCOUNT);
+
+        String sql = toSql(query);
+        System.out.println(sql);
+
+        Assert.assertEquals(sql,"SELECT (`id` + 100) AS `x100` FROM `tb_account`");
+    }
+
+    @Test
+    public void testAdd1() {
+        QueryWrapper query = new QueryWrapper()
+                .select(ACCOUNT.ID.add(100).add(200).add(300).as("x100"))
+                .from(ACCOUNT);
+
+        String sql = toSql(query);
+        System.out.println(sql);
+
+        Assert.assertEquals(sql,"SELECT (`id` + 100 + 200 + 300) AS `x100` FROM `tb_account`");
+    }
+
+    @Test
+    public void testAdd2() {
+        QueryWrapper query = new QueryWrapper()
+                .select(ACCOUNT.ID.add(ACCOUNT.ID).as("x100"))
+                .from(ACCOUNT);
+
+        String sql = toSql(query);
+        System.out.println(sql);
+
+        Assert.assertEquals(sql,"SELECT (`id` + `id`) AS `x100` FROM `tb_account`");
+    }
+
+    @Test
+    public void testAdd3() {
+        QueryWrapper query = new QueryWrapper()
+                .select(ACCOUNT.ID.add(ACCOUNT.ID.add(100)).as("x100"))
+                .from(ACCOUNT);
+
+        String sql = toSql(query);
+        System.out.println(sql);
+
+        Assert.assertEquals(sql,"SELECT (`id` + (`id` + 100)) AS `x100` FROM `tb_account`");
+    }
+
+    @Test
+    public void testAdd4() {
+        QueryWrapper query = new QueryWrapper()
+                .select(ACCOUNT.ID.add(ACCOUNT.ID.add(100)).multiply(100).as("x100"))
+                .from(ACCOUNT);
+
+        String sql = toSql(query);
+        System.out.println(sql);
+
+        Assert.assertEquals(sql,"SELECT (`id` + (`id` + 100) * 100) AS `x100` FROM `tb_account`");
+    }
+
+    @Test
+    public void testSubtract() {
+        QueryWrapper query = new QueryWrapper()
+                .select(ACCOUNT.ID.subtract(100).as("x100"))
+                .from(ACCOUNT);
+
+        String sql = toSql(query);
+        System.out.println(sql);
+
+        Assert.assertEquals(sql,"SELECT (`id` - 100) AS `x100` FROM `tb_account`");
+    }
+
+
+    @Test
+    public void testMultiply() {
+        QueryWrapper query = new QueryWrapper()
+                .select(ACCOUNT.ID.multiply(100).as("x100"))
+                .from(ACCOUNT);
+
+        String sql = toSql(query);
+        System.out.println(sql);
+
+        Assert.assertEquals(sql,"SELECT (`id` * 100) AS `x100` FROM `tb_account`");
+    }
+
+
+    @Test
+    public void testDivide() {
+        QueryWrapper query = new QueryWrapper()
+                .select(ACCOUNT.ID.divide(100).as("x100"))
+                .from(ACCOUNT);
+
+        String sql = toSql(query);
+        System.out.println(sql);
+
+        Assert.assertEquals(sql,"SELECT (`id` / 100) AS `x100` FROM `tb_account`");
+    }
+
+
+
+
+}