The Oracle SQL Developer community is growing with new developers joining every month, with over a million people joining each month.
As a community we all share the same goals and the same set of principles: we all want to build the most efficient, reliable and scalable SQL query engines possible.
The community also shares common goals for development, and in this article we’ll look at some of the key goals of Oracle SQL Development.1.
Optimize SQL Query Performance and Performance Scalability2.
Improve query speed and scalability3.
Improve database performance and performance4.
Improve performance and scalacability by providing data protection5.
Improve the speed and quality of data queries with query templates.SQL Query Templates¶To achieve these goals, we must have an understanding of how SQL queries work.
If you haven’t yet, you may want to read our previous article on SQL Query Templating for more information.
Let’s take a look at an example.
Say we have a simple SQL statement, where we have two parameters, one for a date and another for a time.
We can now take advantage of the SQL query template to get the full information we need.
We have a date object that we can query with the date field.
To query with this date object, we use the date.timeFormat() function.
In this example, we will use the Date.timeFormatter() function, which is a helper function to convert from and to Date.dateFormat() and Date.
timeFormat() .
This is where we use a function that is defined in the SQL dialect to get a value of the form “DateTime.dateformat(year, month, day)”.
So we can use this to query for the day of the month.
Now that we have our date, we can also use the timeFormatter function to query the time in seconds: $db = new-object -com mysqli $db.select -object datetime,timeFormat($date.time) -as time,time.dateFromTimeFormat($date.date) $db $db[“date”] = $date.timestamp$db.schema[‘date’] = “Sat Nov 12 15:37:39 EST 2016” This is an SQL statement that will return the following:DateTimeDateTime(date, timeFormat)Time.timestamps.timetable()(date).timestampDateTime (date, dateTimeFormat)$db[“time”] = (Time.time -Time.duration) $database.schemend(mysql,$db)Now that we know how to query with our date object and time, we need to be able to query against that object.
So we need a function for that.
Let’s create a new function called getDateTime() and call it to query this object.
This function will return a date of the same form as our date.
Now we can call the getDate function from inside the $db context:$db = $db instance.getDateTime($db)$date = $datetime.format($db[“datetime”])$database.query($db,$datetime)$time = $time.timeter$db $date = getDate($datestatename)Now, let’s add some logic to this function: $dateField = $DateField.format(“%Y-%m-%d %H:%M:%S”)$dateField[“date”].setTimeFormat($timeField.time,$timeField[$timeFormat] + “”)$db(“date”).schema[$date] = “Tue Nov 13 19:06:06 EST 2016”} Now that the date object has been created, let me explain why I like this function.
First, the argument for getDate() is an instance of the Date object.
This means that this function will be called from inside a context where we can manipulate the Date instance.
Second, it will not be called directly from within the $database context.
That is because it is not a part of the database context.
So it will only be called within a $db query.
Third, this is the simplest and most straightforward way to query a date in the database.
That’s because the date is a one-to-one relationship, so we only need to query one value.
In fact, if we had more than one date object we could query each of them directly.
Fourth, the getDates() function is not limited to a single date object.
You can use getDate with a number of dates, including: date.timetoString() date.date() date(1, 1, 1)date.datetimeToString()date.timesToString();To query an entire date object with getDate , use the following syntax:$
