Updating clob

25-Aug-2015 09:33 by 6 Comments

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The package is the core JDBC API and provides the functionality for accessing and processing data stored in a data source.

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Obviously you just need to set up the JDBC connection properites to suite your local conditions. )"); prep String(1,id); prep String(2,filename); // Insert empty CLOB data prep String(3, ""); prep String(4, "2009-07-10"); prep Stmt.execute(); // Tidy up... )"); prep String(1,id); prep String(2,filename); // Example shows using available method to obtain no. This is not always guaranteed to be reliable and the // length() method is preferred where appropriate. Alternatively you may use the get Clob() method to obtain an instance of

If you need to modify the existing CLOB data then first run an appropriate query to retrieve the data and then modify it and then perform your update. A more reliable method, however, of obtaining a length when dealing with a fixed length such as a File object is the length() method.

An Oracle Lob differs from an Oracle BFile in that the data is stored on the server instead of in a physical file in the operating system. Oracle Client; // Lob Example public class Lob Example { public static int Main(string[] args) { //Create a connection. Unicode); char[] cbuffer = new char[100]; while((actual = streamreader. Length)) " + actual); // Example - Reading data (all at once). Read To End to obtain // all the string data, or simply // call Oracle Lob.

It can also be a read-write object, unlike an Oracle BFile, which is always read-only. Oracle Connection conn = new Oracle Connection( "Data Source=Oracle8i; Integrated Security=yes"); using(conn) { //Open a connection. Value to obtain a contiguous allocation // of all the data.

This section shows you how to manipulate SQL CLOB objects from your database server using the Ingres JDBC driver.

This section provides developers with sample code that you can use to get started quickly.

Note: the examples in this article are in support of Ingres 9.2.Developers who are not familiar with the JDBC API may want to refer to Sun Microsystem's core online Javadoc Java 5 API.This approach is useful when working with small amounts of data. conn = get Connection(); stmt = conn.create Statement(); rs = stmt.execute Query("SELECT id, filename, xmldocument, timestamp FROM clob_table"); while(rs.next()) { //...other retrieval methods Clob clob = Clob(3); // Test for empty content boolean is Empty = (clob.length() == 0); //... prep Ascii Stream(3, ascii Stream, ascii Stream.available()); prep String(4, "2009-07-10"); prep Stmt.execute(); } catch(Exception ex) { ex.print Stack Trace(); } finally { Db Utils.close Quietly(conn, prep Stmt, rs); } } public static void insert Clob Data(String id, String filename, Reader content, int length) { Connection conn = null; Prepared Statement prep Stmt = null; Result Set rs = null; try { //Obtains a connection conn = get Connection(); prep Stmt = conn.prepare Statement("INSERT INTO clob_table VALUES(? Clob and then call get Ascii Stream() or get Character Stream().It is not, however, recommended when dealing with large amounts of data and using the relevant input stream method is the preferred approach i.e. In the next section the set String and get String methods are particular useful for dealing with 'empty' CLOB values. conn = get Connection(); prep Stmt = conn.prepare Statement("INSERT INTO clob_table VALUES(? public static void insert Clob As ASCIIStream(String id, String filename, Input Stream ascii Stream) { Connection conn = null; Prepared Statement prep Stmt = null; Result Set rs = null; try { //Obtains a connection conn = get Connection(); prep Stmt = conn.prepare Statement("INSERT INTO clob_table VALUES(? The difference is the methods on the Result Set support multiple SQL data types including Clob and Blob data types.public static void update Clob As String(String id, String content) { Connection conn = null; Prepared Statement prep Stmt = null; Result Set rs = null; try { //Obtains a connection conn = get Connection(); prep Stmt = conn.prepare Statement("UPDATE clob_table SET xmldocument = ?WHERE id='" + id + "'"); prep String(1,content); prep Stmt.execute(); } catch(Exception sql Ex) { sql Ex.print Stack Trace(); } finally { Db Utils.close Quietly(conn, prep Stmt, rs); } } Ingres 9.2 does not support updateable Result Set's with LOB data and so using the above approach using either set String, set Ascii Stream and set Character Stream. To obtain the length you may use the available() method of the Input Stream class or use Apache Commons IO library for utility classes.

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