Search results “Oracle is clob empty”
Oracle EMPTY_BLOB Function
https://www.databasestar.com/oracle-lob-functions/ The Oracle EMPTY_BLOB function is used to initialise a LOB column to an empty value. You can use it in an INSERT statement, an UPDATE statement, or with a variable in PL/SQL. The syntax of the EMPTY_BLOB function is: EMPTY_BLOB That’s it - no parameters. Why would you set a BLOB value to empty? It means you have initialised it but not given it a value. It’s good to know this function exists if you ever need to use it. For more information about the Oracle EMPTY_BLOB function, including all of the SQL shown in this video and the examples, read the related article here: https://www.databasestar.com/oracle-lob-functions/
Views: 159 Database Star
Oracle LENGTH Function
https://www.databasestar.com/oracle-length/ The Oracle LENGTH function allows you to find the length of a string, also known as the number of characters in a string. It’s a common feature in different languages, and SQL is no different. The LENGTH function only has one parameter: LENGTH ( string_value ) The parameter is the string_value which is the value to check the length of. The function returns a number that represents the number of characters in the function. Some points to remember about the Oracle LENGTH function: If string_value is NULL, then LENGTH will return NULL. If string_value is an empty string, the LENGTH will return NULL. The string_value can be any of the character data types - CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB, NCLOB. If the string_value is a CHAR data type, then the LENGTH will include any trailing spaces in the value. For more information about the Oracle LENGTH function, including all of the SQL shown in this video and the examples, read the related article here: https://www.databasestar.com/oracle-length/
Views: 353 Database Star
PHP: Storing/Viewing Images Stored In A database (BLOB Data Type)
A video tutorial showing you how to store images inside a database using the BLOB data type. The showing you how to show that image on a page. http://www.abell12.com http://www.facebook.com/pages/Abell12/265102633605437
Views: 259549 abell12
Oracle using SQL Developer Data Pump for export and import
Using Oracle SQL Developer to export and import data via the data pump facilities.
Views: 68181 thehighway360
Java JDBC Tutorial – Part 10: BLOB - Reading and Writing BLOB with MySQL
NEED TO LEARN JAVA? - 5 FREE JAVA VIDEO COURSES - CLICK HERE - https://goo.gl/7i95F8 --- View more videos on my "Java JDBC Tutorial" Playlist: http://goo.gl/crT4nS Download Java Source Code: http://www.luv2code.com/?p=1057 Follow Me on Twitter: https://twitter.com/luv2codetv Please SUBSCRIBE to this channel: https://www.youtube.com/user/luv2codetv?sub_confirmation=1 --- In this video tutorial we will learn how to use JDBC to read and write BLOB with MySQL. --- Transcript Time - 00:00 Hi, this is Chad (Shod) with luv2code.com. Welcome back to another tutorial on Java JDBC. In this video we're going to learn how to read and write BLOBs. For this tutorial we're going to use the employees table. I have a SQL script that will create the table and add sample data for you. You can download it from the link below. The file is sql/table-setup.sql. Time - 00:28 So what exactly is a BLOB? Well a BLOB is basically binary data that we store in the database. You normally use BLOBs to keep track of documents, images, audio, or any other binary object that you have. Note that not all databases have support for BLOBs. In this example we’re going to make use of MySQL and they have BLOB support. Time - 00:48 On this slide we will learn how to create a BLOB column. So when we create a table in MySQL we add a column with the BLOB data type. On this slide I want to learn how to write a BLOB to a database. For this example I'm going to add a resume for an employee. I'm going to read a local PDF file and I'll take that file and update the database with the binary data that's the actual content of PDF file. Let's walk through the code. Time - 01:17 At the beginning I’ll set up a SQL statement. I’ll say update employees set resume equals to question mark where the email address equals [email protected] We’re only going to make a change for this John Doe employee, set up a prepared statement, and then I go, we’re going to create a file that's an actual handle to the local file sample_resume.pdf. Then I’ll set, on my statement I’ll set the binary stream, that first parameter for the resume comma the input. That's the input stream I have for that file. Then I actually call my statement .executeUpdate. That will actually update the database with the binary data. Time - 01:54 All right so let's switch over to Eclipse and let’s look at a very simple demo. I have a program called WriteBlobDemo. In this program we're going to actually read a resume from a local file system and write it as a BLOB to the database. I’ll walk through the code here. The first thing we do is we get a connection to the database. We prepare a statement. We're going to update employees, set resume equals to question mark where email equals [email protected] So we’re going to update the resume for John Doe. Time - 02:22 Then I’ll move down, I’ll set up a file handle for this file sample_resume.pdf. I’ll set up an input stream on that file and then I’ll set that as the parameter for our binary stream for our prepared statement. Then I’ll move through and I’ll actually do an execute update. This will actually store this binary file from the file system into the actual database column. Time - 02:47 I just ran the application and here's the output of the program. So beginning it says that it’s reading the file and gives me the full path to the file just for sanity sake, I know which file is actually reading. Then it tells me that it's storing the resume in the database for our employee [email protected] and then it says that it completed successfully. Excellent. Time - 03:10 Now let's move over to MySQL tool and verify this. I'll take a look at the employees there in the database right now. l’ll run this query select * from employees and I'll get a list of the actual employees. Notice here for John Doe there’s an entry here for a resume, there's a BLOB entry. Note all the other entries are null. So we have a BLOB entry here. I can select this entry. I can right click. I can say, “Open Value in Editor” and it’s going to show me this BLOB. Again, it's a binary large object so we see all this binary data. Actually it should be displayed as hex. Time - 03:50 Instead of looking at it in this fashion there's a tab here called “Image.” I can select this tab and now it'll actually show me this image or the actual data as a PDF that I can view. This is the actual PDF document for this employee, John Doe. This looks really good. We know that we were successful in storing the BLOB in the actual database. Time - 04:18 Now that we know how to write BLOBs in the database let's learn how to read a BLOB from the database. In this example I'm going to read the employee’s resume from the database as a BLOB and then store it as a file on my local files system. Let's walk through the code. [snip] .... see the Transcripts tab for details.
Views: 58524 luv2code
Coalesce function in sql server
This is one of the important function in Sql server which is used to work with Null value.Please watch full video for more detail.
Views: 300 SqlIsEasy
Problem in codeigniter database functions with oracle
When you use codeigniter data base functions with oracle database you will face double quotation marks problem
Views: 950 Bassam nabrees
Create a new query to retrieve all fields from the Products table and all records displaying the...
Create a new query to retrieve all fields from the Products table and all records displaying the phrase MATRIX Y AUTO in their Description field. The Y character may be either 1 or 3. Make sure there is an empty space before and after the Y character. Use the like operator only once. Save the query.Want more? Then download our TEST4U demo from https://www.test4u.eu/en/demo TEST4U provides an innovative approach to learning. Ignore the boring e-courses and use a new, interactive tool like 700 000 satisfied users did. TEST4U is an automated test which cooperates with the actual applications and can be used to prepare the students for certification exams (e.g. Microsoft-Certiport, ECDL/ICDL, DIPLOMA etc.) and train and assess employees. More on https://www.test4u.eu/en/demo
Views: 6 test4u.eu
C# - Insert ,Update ,Delete
See How To Perform Insert,Update,Delete Operation In SQL Using C# Winforms
Views: 543316 Programming At Kstark
How to create Temporary Table in MySql
This video will show you How to create Temporary Table in MySQL. mysql create temporary table mysql tutorial for beginners #techquerypond https://techquerypond.wordpress.com https://techquerypond.com https://twitter.com/techquerypond mysql temporary table performance mysql create temp table create temporary table mysql create table
Views: 6050 Tech Query Pond
Java JDBC Tutorial – Part 9: JDBC ResultSet MetaData with MySQL
NEED TO LEARN JAVA? - 5 FREE JAVA VIDEO COURSES - CLICK HERE - https://goo.gl/7i95F8 --- View more videos on my "Java JDBC Tutorial" Playlist: http://goo.gl/crT4nS Download Java Source Code: http://www.luv2code.com/?p=1049, Follow Me on Twitter: https://twitter.com/darbyluvs2code Please SUBSCRIBE to this channel: https://www.youtube.com/user/luv2codetv?sub_confirmation=1 --- In this video tutorial we will learn how to retrieve JDBC result set metadata with MySQL. --- Transcript Time - 00:00 Hi, this is Chad (Shod) with luv2code.com, welcome back to another tutorial on Java JDBC. In this video, we will learn how to use ResultSet Metadata. For this tutorial we will use the following table: employees. The table already has sample data for testing. I have a SQL script that creates the table and adds sample data. You can download it from the link below. The file is sql/table-setup.sgl. Time - 00:30 ResultSet Metadata can give you information about your ResultSet so to get started with database Metadata you must first retrieve it from the ResultSet object. This is accomplished by calling ResultSet.getMetadata. Then once we have the ResultSet object, we can call methods on it to get the column names and types and also check to see if a column is auto-increment and also if a column is nullable and so on. There are a lot more methods available, see the Javadoc for details. Time - 00:58 All right, so let's go ahead and switch over to clips and see this in action. I have a very simple program called ResultSet demo and this program what I'll do is I'll first start off by getting a connection to the database, then I'll create a statement and I'll execute a query. In this example I have select ID, last name, first name, salary from employees, then once that query is executed I retrieve the ResultSet Metadata. Now that I have the Metadata, I can get information about it. Time - 01:31 The first thing I'd like to do is get the actual column count and that's the number of columns that we have in our query and we display it. Then I'd like to do a four loop and get information about each column. Remember in JDBC, all columns are one based so we start our four loop at the position one and then we move up to the column count. Time - 01:50 The next line here I'll print out the column name, then I'll print out the column type name and so this will give me the database specific type name like varchar, INT or decimal. I'll also check to see if a column is nullable, this will return a certain code if that value's set accordingly. Then I'll also check to see if a column has auto-increments set, this returns true or false. That's pretty much it for the for loop. Time - 02:27 Here's the output of the application. I can see that we have four columns that were returned and this matches it with the query that we submitted. We have the information for the first column, ID, it's an INT, it's not nullable and auto-increments set to true. Last names are varchar, it is nullable, auto-increments set for false. A similar thing here for first name. Then finally, we have our salary, the column type is decimal, it's nullable and auto-increments is set to false also. This looks pretty good. Time - 02:58 What I'd like to do right now is move over to the MySQL tool and just verify some of this information. Here's the actual database schema for the employees' table. The first thing I'll look at is the ID column and we can see that it's of type INT, it's non-nullable and also auto-increment and it's the primary key for the table. We also see that we have last name, first name and those are varchars as was shown by the application and also salary we see it's of type decimal so this really matches up with the information that was presented by the actual Java program. Time - 03:31 For the ResultSet Metadata class, we have additional methods where you can get more details about it but this is enough information to get us started with ResultSet Metadata. Time - 03:42 That wraps up our discussion on using ResultSet Metadata with JDBC. Please subscribe to our channel to view more videos on Java, click the thumbs up to like our video, also visit our website http://www.luv2code.com to download the Java source code used in this video.
Views: 32561 luv2code
81 Advanced Java Tutorial | JDBC | JDBC Connection Pool and Its Utilization | adv java
Advanced Java Tutorial :adv java: JDBC Connection Pool and Its Utilization | java Database connectivity :JDBC Connection Pooling: JDBC Connection pool is a factory that contains set of readily available JDBC connection objects. Using JDBC Connection pool we can make more clients interacting with Database by using minimum JDBC connection objects. JDBC DataSource object represent JDBC Connection pool that means to access connection objects from connection pool we need to use DataSource object. DataSource Object means its the object of a class that implements javax.sql.DataSource interface There are two types of JDBC connection objects: ----------------------------------------------- 1) Direct Connection object: Created by programmer (manually) Ex. Class.forName("oracle.jdbc.driver.OralcleDriver"); Connection con=DriverManager.getConnection("url","user","pass"); 2)Pooled Connection object: It is the object that is collected from JDBC connection pool using JDBC DataSource object. Two types of JDBC connection pools: ----------------------------------- 1) DriverManaged JDBC Connection Pool: (Driver itself maintains connections) -Suitbale for standalone application. -Uses Type 1/2/4/5 drivers directly. -Only few JDBC drivers support this kind of JDBC connection pools ex. Oracle OCI, thin driver 2) Server managed JDBC connection pool: -Suitable for web applicatoin which runs on web/proxy server. -Uses type 3 with type 1/2/4/5 JDBC drivers. -Suitable for 3-tier/n-tier applicatoin which runs on server environment. Example JDBC application on Oracle thin driver to manage the JDBC connection pool for Oracle: ========================================================================= import java.sql.*; import javax.sql.*; import oracle.jdbc.pool.*; public class ConnectionPoolTest { public static void main(String[] args) throws Exception { //create the Empty jdbc datasource object representing driver managed Connection pool for oracle OracleConnectionPoolDataSource ds=new OracleConnectionPoolDataSource(); //give the details to create JDBC connection objects in the above empty datasource connection pool i.e 'ds' ds.setDriverType("thin"); ds.setServerName("localhost"); ds.setPortNumber(1521); ds.setServiceName("orcl"); ds.setUser("scott"); ds.setPassword("boss"); //Upto here JDBC connection pool ready with JDBC connection object //get one JDBC connection object from connnection pool Connection con=ds.getConnection(); // Write the JDBC persistant logic Statement st=con.createStatement(); ResultSet rs=st.executeQuery("select * from student"); while(rs.next()){ System.out.println(rs.getInt(1)+"\t"+rs.getString(2)+"\t"+ rs.getString(3)); } rs.close(); st.close(); con.close(); // --- returns/release the conection object back to JDBC connection pool } }
Views: 661 tech fort
Component Designer in Talend Open Studio
Tutorial on developing components with Talend Open Studio
Views: 7107 Bekwam, Inc