How To Role Preparedstatement Inwards Jdbc Java? An Example

PreparedStatement is used to execute specific queries which are supposed to run repeatedly, for example, SELECT * from Employees WHERE EMP_ID=?. This query tin survive run multiple times to fetch details of unlike employees. If yous role PreparedStatement similar inwards a higher house than database assistance inwards query preparation, which is faster as well as to a greater extent than secure. Such form of queries are compiled, as well as their query plans are cached at database side to every fourth dimension yous execute it, yous volition acquire a faster response equally opposed to using uncomplicated queries via Statement object, similar SELECT * from Employees WHERE EMP_ID + emp_id.

The divergence betwixt the inwards a higher house 2 queries is house holder, I mean, the "?" character, 1 is using String concatenation to do dynamic query piece PreparedStatement uses bind parameters to supply dynamic nature.

The string concatenation version likewise has security resultant because it tin survive targeted amongst SQL injection, precisely the placeholder version, i.e. which uses PreparedStatement provides security against SQL injection inwards Java.

In this article, yous volition larn how to role PreparedStatement to execute SQL query inwards Java using JDBC API. You volition likewise larn the pros as well as cons of using PreparedStatement inwards Java. But, if yous desire to larn to a greater extent than nearly JDBC API as well as other of import APIs inwards Java as well as thence I advise yous conduct maintain a hold back at The Complete Java Masterclass on Udemy, 1 of the most comprehensive as well as up-to-date course of report on Java.

Steps to Create PreparedStatement

1) Create Database Connection

2) Create SQL query amongst Placeholder, similar SELECT * from STOCKS WHERE TICKER=?

3) Create a PreparedStatement object yesteryear calling the Connection.prepareStatement() method as well as passing the SQL created inwards previous steps.

4) Set the query parameter yesteryear calling diverse setXXX() method of PreparedStatement object depending upon information type.

5) Run the PreparedStatement yesteryear calling the executeQuery() method of PreparedStatement

6) The previous measurement returns a ResultSet containing all the rows returned yesteryear SQL query. Iterate through ResultSet as well as impress information or do an object out of those data.


Here are code sample as well as especial explanation of each step

1) Create Database Connection
You involve JDBC driver for the database yous desire to connect, e.g. if yous desire to connect Oracle, yous involve ojdbc6.jar, if yous desire to connect MySQL as well as thence yous involve mysql-connector-java-5.1.23-bin.jar.

And, if yous desire to connect Microsoft SQL Server as well as thence yous involve sqljdbc4.jar. It likewise depends upon which version of the database yous are connecting. You likewise involve respective JDBC URL, username, as well as password to connect the database.


2) Create SQL query amongst Placeholder 
The "?" grapheme is used for a placeholder, yous tin define equally many placeholders yous want, equally shown below:

String SQL = SELECT * from STOCKS WHERE TICKER=?

3) Connection.prepareStatement()
Create PreparedStatement object yesteryear calling Connection.prepareStatement() method as well as passing the SQL created inwards previous steps.

PreparedStatement ps = con.prepareStatement(SQL);


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