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Setting the Hibernate batching size can be accomplished via hibernate.jdbc.batch_size. In Spring, we need to add in application properties per the following setting (the recommended batch size is between 5
LOCK_TIMEOUT?specifies the number of milliseconds a statement should wait for a lock to be released, for example: SET LOCK_TIMEOUT 1000 –Wait one second
Elements that are added after initial page load through an DOM action do not have event handlers attached to them. We can use the live event handler to attach the
Every table in MySQL will have a storage engine that offers certain capabilities. Some storage engines offer performance, some of them transaction support, and so on. By default, all tables
Via Java Reflection API, we can obtain all the annotations of a class as follows: Class clazz = Foo.class;Annotation[] clazzAnnotations = clazz.getAnnotations();
NUMERIC_ROUNDABORT?specifies the level of error reporting that has been generated when an expression being rounded has caused loss of precision. SET NUMERIC_ROUNDABORT ON
See below for a code sample of how to perform byte and string conversions: using System.Runtime.Remoting.Metadata.W3cXsd2001;public static byte[] GetStringToBytes(string stringValue){ SoapHexBinary result = SoapHexBinary.Parse(stringValue); return result.Value;}public static string GetBytesToString(byte[] byteArray){
In order to check whether or not an index is in range [0, n) we can rely on a “if” statement, as below: if (index = n) { … }
MySQL allows various permissions to be set for users during (or after) creation. The following command comes handy to understand what GRANTS a user has. Command: SHOW GRANTS FOR user;
Beginning with JDK 8, the machine UTC timestamp with nanoseconds precision can be obtained via the java.time.Instant class as below: // e.g., 2019-02-26T15:28:21.051163100ZInstant now = Instant.now();
Reseed all Autonumber fields in all tables with the following query: EXEC sp_MSForEachTable ‘ IF OBJECTPROPERTY(object_id(”?”), ”TableHasIdentity”) = 1 DBCC CHECKIDENT (”?”, RESEED, 0)
Starting with JDK 9, we can create an immutable list via the suite of List#of(…) methods. For example, an immutable list of 3 elements can be created as follows: import java.util.List;…List
There are several approaches for repeating a string n times. In functional-style, we can rely on Stream.generate(), as in the following example: String result = Stream.generate(() – TEXT) .limit(5) .collect((joining()));
This command is similar to that of an operating system command that shows all the processes. In MySQL, this command, when executed, lists all of the processes that hold a
Before Java 7, this task required a comparator and the compareTo() method. But, beginning with Java 7, is advisable to rely on Integer.compare(), which is not exposed to overflow risks
To get the last day of the current month, do the following: SELECT CONVERT(VARCHAR(25), DATEADD(DAY, -(DAY(GETDATE())), DATEADD(MONTH, 1, GETDATE())), 105) LastDay
Finding all of the available drives in the system is often useful. The following code snippet brings up a list of the available drives: */import java.io.File;public class SystemDrives{ public static
In order to obtain statistics regarding SQL queries executed via Hibernate, we need to set hibernate.generate_statistics=true. In Spring, we need to add in application.properties the following setting: spring.jpa.properties.hibernate.generate_statistics=true
You can get the current precision by executing the following command: SELECT @@MAX_PRECISION AS ‘MAX_PRECISION’
Collection has an unmodifiableCollection method that returns a collection object that cannot be modified. It means that you cannot add or remove any element from the collection. import java.util.*;public class UnmodifiableCollection{
Beginning with JDK 12, we can indent strings via String.indent(int n), in which n is the number of spaces.Example : indent text “abc” with 10 spaces: “abs”.indent(10);
You can rebuild all indexes present in your database with the following query: EXEC sp_MSforeachtable @command1=”print ‘?’ DBCC DBREINDEX (‘?’, ‘ ‘, 80)” GO EXEC sp_updatestats GO
You can get the current language of SQL Server with the following command: SELECT @@LANGUAGE AS Current_Language;
TemporalAdjusters is a class in Java that is oriented towards bettering the options of Calendar. You can easily compute the dates of firstDayOfNextMonth, lastDayOfMonth, next Wednesday, etc. TemporalAdjusters have many more methods
Beginning with JDK 11, we can return a boolean if the Optional is empty via Optional#isEmpty(): public boolean bookIsEmpty(long id) { Optional book = // code that fetches the book
You can recompile certain stored procedures with the following command: EXEC sp_recompile ‘Procedure_Name’; GO
If we want to define a valid URL instance for a file we need to add the “file” protocol as in the following example: URL url = new URL(“file:///C:/photos/me.png”);
See how to use this form of Regex below to identify whether or not a string has only alphabets present. public class RegexHasOnlyAlphabets{ public static void main(String args[]) { RegexHasOnlyAlphabets
You can RESEED?Identity Columns of all tables by using sp_MSForEachTable?to loop through all the tables and executing the DBCC CHECKIDENT?command if the specific table has an identity column: EXEC sp_MSForEachTable
See how to add or subtract days, months or years with these operations. LocalDate tomorrow = LocalDate.now().plusDays(3);LocalDateTime anHourFromNow = LocalDateTime.now().plusHours(10);Long daysBetween = java.time.temporal.ChronoUnit.DAYS.between(LocalDate.now(), LocalDate.now().plusDays(2));Duration duration = Duration.between(Instant.now(), ZonedDateTime.parse(“2018-08-30T09:00:00+01:00[Europe/Stockholm]”));
