Implementing date_sub() function with intervals with jOOQ

问题

I've been dealing with this since yestertay.

The thing is I am migrating my queries to jOOQ and I got stuck when I tried to implement this part:

select * from table where condition1 and date1 >= date_sub(now(), interval 1 days)

Specifically this part of the condition: date_sub(now(), interval 1 days) with jOOQ.

So my questions are:

1. Which functions should I use from jOOQ to represent date_sub?

2. How do I implement interval X days with jOOQ?

To clarify, the dates are of the type Timestamp

Thanks in advance!

回答1:

The solution:

Being slightly biased towards the Oracle database, jOOQ implements adding / subtracting day intervals simply by using:

// Java
DSL.currentTimestamp().sub(1);

The above renders:

-- Oracle
sysdate - 1

-- MySQL
date_add(current_timestamp(), interval -1 day)

Of course, you can also access the date_add() function directly, if you prefer that:

// Java
DSL.dateAdd(DSL.currentTimestamp(), -1);

Some documentation:

• The manual's section about date time arithmetic
• The manual's section about interval data types
• Field.add() Javadoc
• DSL.dateAdd() Javadoc

来源：https://stackoverflow.com/questions/18386172/implementing-date-sub-function-with-intervals-with-jooq