1. String concatenation can be surprisingly performance intensive.

2. Here the "addition" that is performed is string concatenation.

3. This time, a string concatenation has occurred within the same method, and the input parameter is now bound to a String type argument at function execution time.

4. Notice that we have simple string concatenation here ("." is the concatenation operation in Perl).

5. Also notice the query in which we use string concatenation to add the $name parameter to the query.

6. Be aware that simple string concatenation can be a dangerous way to construct XML documents in general (see Resources for an article that expands on this point).

7. It then uses string concatenation to create a complete, well-formed XML document from it.

7. try its best to collect and make good sentences.

8. Listing 3: String concatenation for producing a single cache key out of the diffferent keys and IDs.

9. Variables can be injected into the query using string concatenation in PHP.

10. String concatenation is the primary point of entry for script injection.

11. Basically, if you're using simple string concatenation or string substitution to create SQL queries, it's likely you're headed for trouble.

12. You can build a HQL WHERE clause using either binding parameters or simple string concatenation; the decision impacts on performance.

13. The wrong way to invoke SQL is to simply perform string concatenation (or interpolation) to create your SQL command using data that hasn't undergone extremely narrow screening.

14. Furthermore, the speed-critical sections of the Java run-time environment, that do things like string concatenation and comparison,[] are implemented with efficient native code.

15. Going back to Listing 14, once we have the list of entries, we then use some simple string concatenation to create an XML document.

16. Like the propertySheetTemplate XML code in our example, we build the by String concatenation.

17. Listing 2 shows a sample algorithm which creates such a key by string concatenation.

18. We are not using the unified programming model offered by WCF and the URL is hacked together using string concatenation.

19. You'll also find some simplifications from C, which include string concatenation, associative array elements, and aggregation operators.

20. To keep it simple, in our example we construct this XML document by string concatenation; however, in a real-life project, you might need to use a Document Object Model (DOM) or a similar XML API.