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PDFBox How to read PDF file in Java
This article shows you how to use Apache PDFBox to read a PDF file in Java.
Date: 2019-08-11 View: 1253
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Java How to Split String by New Line
In Java, we can use regex \\r?\\n to split a String by new line.
Date: 2019-08-11 View: 1354
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Oracle PL/SQL – Before DELETE Trigger example
This article shows you how to use BEFORE DELETE TRIGGER, it will fire before the delete operation is executed. In real life scenarios, it is mostly used for purposes like:
Date: 2019-08-11 View: 2007
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Oracle PL/SQL – INSTEAD OF Trigger example
This article shows you how to use INSTEAD OF TRIGGER to update
Date: 2019-08-11 View: 1769
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Oracle PL/SQL ABS function example
This ABS() function returns absolute value of a number, for example, the absolute value of 5 is 5, and the absolute value of -5 is also 5. In Mathematics, absolute value can be think of as a distance from zero.
Date: 2019-08-11 View: 1928
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Oracle PL/SQL ASIN function example
The ASIN() function returns arc sine of input n, the input n must be in the range of -1 to 1. The function will return a value in the range of -pi/2 to pi/2, expressed in radians.
Date: 2019-08-11 View: 1853
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Java How to print a Pyramid
A Java example to print half and full pyramid, for fun.
Date: 2019-08-11 View: 1271
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Oracle PL/SQL ACOS function example
The ACOS() function returns the arc cosine of input n, the input n must be in the range of -1 to 1. The function will return a value in the range of 0 to pi, expressed in radians.
Date: 2019-08-11 View: 1164
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Oracle PL/SQL FLOOR function example
The FLOOR() function round the specified number down, and return the largest number that is less than or equal to the specified number.
Date: 2019-08-11 View: 1242
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Oracle PL/SQL CEIL function example
The CEIL function round the specified number up, and return the smallest number that is greater than or equal to the specified number.
Date: 2019-08-11 View: 1161
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Oracle PL/SQL ATAN and ATAN2 function example
This article show you how to use ATAN() and ATAN2() function in Oracle PL/SQL.
Date: 2019-08-11 View: 1089
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Oracle PL/SQL ALTER function example
The ALTER FUNCTION statement explicitly recompile a standalone function. Sometimes, ALTER TABLE on the table being used in function will cause the function becomes INVALID, we need to recompile (alter function) it to make it VALID again.
Date: 2019-08-11 View: 1555
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MongoDB Failed to unlink socket file /tmp/mongodb-27017
Upgraded MongoDB and unable to start the mongod process, review the /var/log/mongodb/mongod.log file, and found the following error messages :
Date: 2019-08-11 View: 2261
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MongoDB bind() failed errno:99 Cannot assign requested address for socket
Review the server environment, we need to allow Server B to access the Server A MongoDB database.
Date: 2019-08-11 View: 1483
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Mac OSX What is the difference between /etc/hosts and /private/etc/hosts
They are the same file, /etc map to /private/etc
Date: 2019-08-11 View: 1028