各位，本次新版本做了比较大的优化，主要修复的问题如下：#79，#48，#67，#56

项目地址：https://github.com/braisdom/ObjectiveSql

重点特性介绍：

1）优化SQL 生成逻辑

Order.Table orderTable = Order.asTable();
Select select = new Select();

select.project((sum(orderTable.amount) / sum(orderTable.quantity) * 100).as("unit_amount"))
        .from(orderTable)
        .where(orderTable.quantity > 30 &&
                orderTable.salesAt.between("2020-05-02 23:59:59", "2020-05-02 23:59:59"))
        .groupBy(orderTable.memberId);

SELECT (SUM(`orders_t0`.`amount` ) / SUM(`orders_t0`.`quantity` ) * 100) AS unit_amount
FROM `orders` AS `orders_t0`
WHERE `orders_t0`.`quantity` > 30 AND `orders_t0`.`sales_at` BETWEEN '2020-05-01 00:00:00' AND '2020-05-02 23:59:59'
GROUP BY `orders_t0`.`member_id`

深度解析javac 构建AST 过程，对执行优先级和括号进行解析，生成完全符合Java 编码的SQL 语句

2）永真表达式（实现动态SQL 构建）

Order.Table orderTable = Order.asTable();
Select select = new Select();
LogicalExpression eternalExpression = new EternalExpression();

if(filteredNo.length > 0) {
    eternalExpression = eternalExpression.and(orderTable.no.in(filteredNo));
}

if(filteredQuantity != 0) {
    eternalExpression = eternalExpression.and(orderTable.quantity > filteredQuantity);
}

select.project((sum(orderTable.amount) / sum(orderTable.quantity) * 100).as("unit_amount"))
        .from(orderTable)
        .where(eternalExpression)
        .groupBy(orderTable.memberId);