clob

Overcomplicated oracle jdbc BLOB handling

由 半城伤御伤魂 提交于 2019-11-27 04:16:25
问题 When I search the web for inserting BLOBs into Oracle database with jdbc thin driver, most of the webpages suggest a 3-step approach: insert empty_blob() value. select the row with for update . insert the real value. This works fine for me, here is an example: Connection oracleConnection = ... byte[] testArray = ... PreparedStatement ps = oracleConnection.prepareStatement( "insert into test (id, blobfield) values(?, empty_blob())"); ps.setInt(1, 100); ps.executeUpdate(); ps.close(); ps =

Issues calling stored procedure from C# with large CLOB

由 不打扰是莪最后的温柔 提交于 2019-11-27 02:14:49
问题 I'm not the first to have these issues, and will list some reference posts below, but am still looking for a proper solution. I need to call a stored procedure (Oracle 10g database) from a C# web service. The web server has an Oracle 9i client installed and I am using Microsofts System.Data.OracleClient . The procedure takes an XML as a CLOB. When the XML was over 4000 Bytes (which is likely in a normal use case), I stumbled over the following error: ORA-01460 - unimplemented or unreasonable

Hibernate > CLOB > Oracle :(

由 随声附和 提交于 2019-11-26 23:25:03
问题 I am trying to write to an Oracle clob field a value over 4000 characters. This seams to be a common issue but non of the solutions seem to work. So I pray for help from here. Down and dirty info: Using Oracle 9.2.0.8.0 Hibernate3 implementing pojo's with annotations Tomcat 6.0.16 Oracle 10.2.x drivers C3P0 connction pool provider In my persistence.xml I have: <persistence-unit name="DWEB" transaction-type="RESOURCE_LOCAL"> <provider>org.hibernate.ejb.HibernatePersistence</provider>

Hibernate on Oracle: mapping String property to CLOB column

由 流过昼夜 提交于 2019-11-26 23:22:02
问题 WARNING : see my own answer below. The problem is caused by old Oracle drivers that were present on the classpath in addition to 10.2.0.4. Problem solved. Leaving the rest of this question for posterity. I've been banging my head against the following. Here's a simple POJO distilled from my application code: @Entity @Table(name = "PIGGIES") public class Piggy { private Long id; private String description; public Piggy() {} @Id @GeneratedValue @Column(name = "PIGGY_ID") public Long getId() {

Performance of SUBSTR on CLOB

由 ╄→尐↘猪︶ㄣ 提交于 2019-11-26 22:53:36
问题 I have a PL/SQL procedure that does a lot of SUBSTR s on a VARCHAR2 parameter. I would like to remove the length limit, so I tried to change it to CLOB . Works fine, but performance suffers, so I did some tests (based on these tests from 2005). UPDATE : I can reproduce this on several different instances with different Oracle versions and different hardware, dbms_lob.substr is always noticeable slower than substr(CLOB) , and a lot slower than SUBSTR(VARCHAR2) . Bob's results and the tests in

Disabling contextual LOB creation as createClob() method threw error

由 南笙酒味 提交于 2019-11-26 22:37:54
问题 I am using Hibernate 3.5.6 with Oracle 10g. I am seeing the below exception during initialization but the application itself is working fine. What is the cause for this exception? and how it can be corrected? Exception Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException Info Oracle version: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 JDBC driver: Oracle JDBC driver, version: 11.1.0.7.0 回答1: Disable this warning by

Exporting a CLOB to a text file using Oracle SQL Developer

由 与世无争的帅哥 提交于 2019-11-26 20:18:08
问题 I am using Oracle SQL Developer and trying to export a table to a CSV file. Some of the fields are CLOB fields, and in many cases the entries are truncated when the export happens. I'm looking for a way to get the whole thing out, as my end goal is to not use Oracle here (I received an Oracle dump - which was loaded into an oracle db, but am using the data in another format so going via CSV as an intermediary). If there are multiple solutions to this, given that it is a one time procedure for

How to query a CLOB column in Oracle

由 房东的猫 提交于 2019-11-26 18:54:35
I'm trying to run a query that has a few columns that are a CLOB datatype. If i run the query like normal, all of those fields just have (CLOB) as the value. I tried using DBMS_LOB.substr(column ) and i get the error ORA-06502: PL/SQL: numeric or value error: character string buffer too small How can i query the CLOB column? mrjohn When getting the substring of a CLOB column and using a query tool that has size/buffer restrictions sometimes you would need to set the BUFFER to a larger size. For example while using SQL Plus use the SET BUFFER 10000 to set it to 10000 as the default is 4000.

How do I store a string longer than 4000 characters in an Oracle Database using Java/JDBC?

由 ╄→гoц情女王★ 提交于 2019-11-26 18:31:05
问题 I’m not sure how to use Java/JDBC to insert a very long string into an Oracle database. I have a String which is greater than 4000 characters, lets say it’s 6000. I want to take this string and store it in an Oracle database. The way to do this seems to be with the CLOB datatype. Okay, so I declared the column as description CLOB. Now, when it comes time to actually insert the data, I have a prepared statement pstmt. It looks like pstmt = conn.prepareStatement(“INSERT INTO Table VALUES(?)”) .

Most efficient solution for reading CLOB to String, and String to CLOB in Java?

由 白昼怎懂夜的黑 提交于 2019-11-26 13:48:04
问题 I have a big CLOB (more than 32kB) that I want to read to a String, using StringBuilder. How do I do this in the most efficient way? I can not use the "int length" constructor for StringBuilder since the lenght of my CLOB is longer than a "int" and needs a "long" value. I am not that confortable with the Java I/O classes, and would like to get some guidance. Edit - I have tried with this code for clobToString(): private String clobToString(Clob data) { StringBuilder sb = new StringBuilder();
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