I have an application where I can express types of data items with media types. In some places, I use UUID in text (e.g., 123e4567-e89b-12d3-a456-426614174000) and binary (16 octets). I can't find a media type to describe text or binary UUID. I was expecting to find something like text/uuid and application/uuid. What would be an appropriate media type for UUID?
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I have the one table in sql server with one field annoation as text data type.
I have used spring jdbc template to get the annotation text field data and then I have used Following API (BaseRowMapper) to map table column to java pojo.
below is my table structure:
While retrieving data I am getting below exception.
org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'net.sourceforge.jtds.jdbc.ClobImpl' to required type 'java.lang.String' for property 'annotation'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [net.sourceforge.jtds.jdbc.ClobImpl] to required type [java.lang.String] for property 'annotation': no matching editors or conversion strategy found
at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:464)
at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:495)
at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:1099)
at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:884)
at com.ecw.vascular.model.BaseRowMapper.mapRow(BaseRowMapper.java:39)
at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:92)
at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:60)
at org.springframework.jdbc.core.JdbcTemplate$1.doInPreparedStatement(JdbcTemplate.java:651)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:589)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:639)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:664)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:704)
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:179)
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:185)
at com.ecw.vascular.dao.BaseDao.executeQuery(BaseDao.java:113)
at com.ecw.vascular.dao.ObservationDao.findByPatientAndEncounter(ObservationDao.java:64)
The problem lies on the datatype used in the SQL Server database to store a String of maximum 16 byte.
Text can store up to 2 GB of variable width character string data, so JDBCTemplate uses a CLOB to retrieve the data from that column.
Since the maximum length is 16, one solution can be to change the datatype on the database to a more appropriate varchar.
If this is not an option and since the error mentions a jtds implementation of CLOB, you can try to change the jdbc connection string to
jdbc:jtds:sqlserver://ServerName;**useLOBs=false**;DatabaseName=xxx;instance=xxx
A third-highly not recommended - option would be to use a CLOB instead of a String inside the java bean, with all the relative changes needed to deal with databases LOBs.
I'm not being able to understand how is the data type geography in SQL server...
For example I have the following data:
0xE6100000010CCEAACFD556484340B2F336363BCA21C0
what I know:
0x is prefix for hexadecimal
last 16 numbers are longitude: B2F336363BCA21C0 (double of decimal format)
16 numbers before the last 16 are latitude: CEAACFD556484340 (double of decimal format)
4 first numbers are SRID: E610 (hexadecimal for WGS84)
what I don't understand:
numbers from 5 to 12 : 0000010C
what is this?
From what I read this seems linked to WKB(Well Known Binary) or EWKB(Extended Well Known Binary) anyway i was not abble to find a definition for EWKB...
And for WKB this is supposed to be geometry type (4-byte integer) but the value doesn't match with the Geometry types codes (this example is for one point coordinate)
Can you help to understand this format?
The spatial types (geometry and geography) in SQL Server are implemented as CLR data types. As with any such data types, you get a binary representation when you query the value directly. Unfortunately, it's not (as far as I know) WKB but rather whatever format Microsoft decided was best for their implementation. For us (the users), we should work with the published interface of methods that have been published by MS (for instance the geography method reference). Which is to say that you should only try to decipher the MS binary representation if you're curious (and not for actually working with it).
That said, if you need/want to work with WKB, you can! For example, you can use the STGeomFromWKB() static method to create a geography instance from WKB that you provide and STAsBinary() can be called on a geography instance to return WKB to you.
The Format spec can be found here:
https://msdn.microsoft.com/en-us/library/ee320529(v=sql.105).aspx
As that page shows, it used to change very frequently, but has slowed down significantly over the past 2 years
I am currently needing to dig into the spec to serialize from JVM code into a bcp file so that I can use SQLServerBulkCopy rather than plain JDBC to upload data into tables (it is about 7x faster to write a bcp file than using JDBC), but this is proving to be more complicated than what I originally anticipated.
After testing with bcp, you can upload geographies by specifying an off row format ( varchar(max) ) and store the well known text, SQL server will see this and assume you wanted a geography based on the WKT it sees.
In my case converting to nvarchar resolved the issue.
I have question about this pdf. What is ATT_TYPE in the ATTRIBUTE Table in figure 1? Firstly, I assumed that it contains database field type (like integer, varchar and so on..). But the type of ATT_TYPE field is integer. It can`t contain string like 'varchar'.
I'm using SNAP dataset for social network analysis. SNAP uses simple edge list as a data format. How to read SNAP dataset in Apache Giraph?
As per I know SNAP has various data formats depending upon which dataset you are looking at. If the dataset that you are looking at has the format : sourceid destinationid on each line then you might want to use IntNullTextEdgeInputFormat (it's in giraph-core/src/main/java/org/apache/giraph/io/formats ).
Also take a look at various predefined formats available in the same folder. If none of those fit for your dataset format then you can write your own input format class (it will be really simple if you start from the predefined formats and edit it as you need).
use -eif org.apache.giraph.io.formats.IntNullTextEdgeInputFormat
Yes, SNAP uses Simple Edge List format for representing graph databases. You can use this code for converting it to a JSON format which is accepted by Apache Giraph.
i have a large data set, tcpdump capture file exported to text.
I want to find any like unknown pattern in the data set and return the fields
and data sorted. basically we wish to look for unknown "patterns" in the data set.
i know we can use a regex with like awk and grep, but from a pure research perspective, im given a data set 5Gb and 10Gb, in which i want to find unknown like matching patterns....
they could be from any field or data structure. Ive used wireshark in various modes to sort structures