bytea

How to read bytea image data from PostgreSQL with JPA?

走远了吗. 提交于 2020-02-13 04:46:39
问题 I have PostgreSQL database and there is column 'image' with datatype 'bytea'. I cannot modify columns or database configurations. JPA annotated POJO contains followign mapping @Column(name="image") private byte[] image; The returned data is in following format (this is just a sample) WF5ClN6RlpLZ0hJTUdNQ1FJWmkwcFVGSUdNQ0lDWUE5TUEvanRFeElwK2x0M2tBQUFBQVNVVk9SSzVDWUlJPQo= When I write this data to file (.jpeg) photo viewer says "this is corrupted file". I also understand that actual image byte

How to read bytea image data from PostgreSQL with JPA?

强颜欢笑 提交于 2020-02-13 04:46:09
问题 I have PostgreSQL database and there is column 'image' with datatype 'bytea'. I cannot modify columns or database configurations. JPA annotated POJO contains followign mapping @Column(name="image") private byte[] image; The returned data is in following format (this is just a sample) WF5ClN6RlpLZ0hJTUdNQ1FJWmkwcFVGSUdNQ0lDWUE5TUEvanRFeElwK2x0M2tBQUFBQVNVVk9SSzVDWUlJPQo= When I write this data to file (.jpeg) photo viewer says "this is corrupted file". I also understand that actual image byte

How to read bytea image data from PostgreSQL with JPA?

孤者浪人 提交于 2020-02-13 04:46:06
问题 I have PostgreSQL database and there is column 'image' with datatype 'bytea'. I cannot modify columns or database configurations. JPA annotated POJO contains followign mapping @Column(name="image") private byte[] image; The returned data is in following format (this is just a sample) WF5ClN6RlpLZ0hJTUdNQ1FJWmkwcFVGSUdNQ0lDWUE5TUEvanRFeElwK2x0M2tBQUFBQVNVVk9SSzVDWUlJPQo= When I write this data to file (.jpeg) photo viewer says "this is corrupted file". I also understand that actual image byte

How to decode PostgreSQL bytea column hex to int16/uint16 in r?

心已入冬 提交于 2020-01-09 11:53:07
问题 I have some image data stored in a PostgreSQL database table column as bytea. I also have metadata about the data for use in interpreting it, relevant ones being image dimensions and class. Classes include int16, uint16. I cannot find any information on interpreting signed/unsigned ints correctly in R. I am using RPostgreSQL to pull the data into R and I want to view the image in R. MWE: # fakeDataQuery <- dbGetQuery(conn, # 'select byteArray, ImageSize, ImageClass from table where id = 1') #

How to decode PostgreSQL bytea column hex to int16/uint16 in r?

时光怂恿深爱的人放手 提交于 2020-01-09 11:52:46
问题 I have some image data stored in a PostgreSQL database table column as bytea. I also have metadata about the data for use in interpreting it, relevant ones being image dimensions and class. Classes include int16, uint16. I cannot find any information on interpreting signed/unsigned ints correctly in R. I am using RPostgreSQL to pull the data into R and I want to view the image in R. MWE: # fakeDataQuery <- dbGetQuery(conn, # 'select byteArray, ImageSize, ImageClass from table where id = 1') #

How to write and read binary data with RPostgresql

吃可爱长大的小学妹 提交于 2020-01-07 03:00:39
问题 I am trying to execute the code: Connect to the server library('RPostgreSQL', quietly = TRUE) kHostName <- '...' kPort <- '5432' kDBName <- '...' kUser <- '...' kPassword <- '...' drv <- dbDriver("PostgreSQL") con <- dbConnect(drv, host = kHostName, port = kPort, dbname = kDBName, user = kUser, password = kPassword) The following part of the code is taken from https://groups.google.com/forum/#!topic/rpostgresql-dev/lPPmS8yeP9w and https://github.com/codeinthehole/rpostgresql/blob/master

PostgreSQL 9.X bytea representation in 'hex' or 'escape' for thumbnail images

怎甘沉沦 提交于 2020-01-03 16:37:28
问题 My application (developed in Delphi and ZEOS components) uses PostgreSQL 8.4 and stores some thumbnail images into a bytea column. I want to migrate to PostgreSQL 9.2 and have restored the dump and everything works fine except when I try to retrieve those images: Postgres 9.2 uses hex for output representation instead of escape used in Postgres 8.4. There are two possible solutions: Change the Postgres 9.2 settings for escape representation or change the hex string in binary data via

PostgreSQL 9.X bytea representation in 'hex' or 'escape' for thumbnail images

北城以北 提交于 2020-01-03 16:37:06
问题 My application (developed in Delphi and ZEOS components) uses PostgreSQL 8.4 and stores some thumbnail images into a bytea column. I want to migrate to PostgreSQL 9.2 and have restored the dump and everything works fine except when I try to retrieve those images: Postgres 9.2 uses hex for output representation instead of escape used in Postgres 8.4. There are two possible solutions: Change the Postgres 9.2 settings for escape representation or change the hex string in binary data via

ERROR: column “publish_date” is of type date but expression is of type bytea

拥有回忆 提交于 2019-12-25 12:33:23
问题 I'm trying to insert objects of type Book into a database, and one of the columns is specified as date, but according to this exception: Caused by: org.postgresql.util.PSQLException: ERROR: column "publish_date" is of type date but expression is of type bytea Hint: You will need to rewrite or cast the expression. Position: 94 at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2412) at org.postgresql.core.v3.QueryExecutorImpl.processResults

ERROR: column “publish_date” is of type date but expression is of type bytea

巧了我就是萌 提交于 2019-12-25 12:32:42
问题 I'm trying to insert objects of type Book into a database, and one of the columns is specified as date, but according to this exception: Caused by: org.postgresql.util.PSQLException: ERROR: column "publish_date" is of type date but expression is of type bytea Hint: You will need to rewrite or cast the expression. Position: 94 at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2412) at org.postgresql.core.v3.QueryExecutorImpl.processResults