postgresql

问题 There does not seem to be an obvious way: select 'a123'::text::jsonb = ERROR: invalid input syntax for type json select '"a123"'::text::jsonb = BAD string because quoted check select '"a123"'::text::jsonb = ('{"x":"a123"}'::jsonb)->'x' to see that non-quoted is the correct . select '123'::text::jsonb = ('{"x":123}'::jsonb)->'x'; = NOT string I need '123' and 'a123' as pure JSONb strings . PS: it is not a duplicate of generic automatic-anything conversion. 回答1: To convert untyped string

问题 There does not seem to be an obvious way: select 'a123'::text::jsonb = ERROR: invalid input syntax for type json select '"a123"'::text::jsonb = BAD string because quoted check select '"a123"'::text::jsonb = ('{"x":"a123"}'::jsonb)->'x' to see that non-quoted is the correct . select '123'::text::jsonb = ('{"x":123}'::jsonb)->'x'; = NOT string I need '123' and 'a123' as pure JSONb strings . PS: it is not a duplicate of generic automatic-anything conversion. 回答1: To convert untyped string

问题 There does not seem to be an obvious way: select 'a123'::text::jsonb = ERROR: invalid input syntax for type json select '"a123"'::text::jsonb = BAD string because quoted check select '"a123"'::text::jsonb = ('{"x":"a123"}'::jsonb)->'x' to see that non-quoted is the correct . select '123'::text::jsonb = ('{"x":123}'::jsonb)->'x'; = NOT string I need '123' and 'a123' as pure JSONb strings . PS: it is not a duplicate of generic automatic-anything conversion. 回答1: To convert untyped string

问题 I wanted to do batch updates using Springs JDBC template in postgre. However, I am curious that do I really need to use the jdbcTemplate.BatchUpdate() calls. I read in several places that they are slower if not implemented correctly. Will adding a @Transactional on the method that inserts in a loop achieve the same functionality of batching the updates? If the below method that inserts one record at a time, is called from a loop which is in a transactional as shown, will this cause updates to

问题 There does not seem to be an obvious way: select 'a123'::text::jsonb = ERROR: invalid input syntax for type json select '"a123"'::text::jsonb = BAD string because quoted check select '"a123"'::text::jsonb = ('{"x":"a123"}'::jsonb)->'x' to see that non-quoted is the correct . select '123'::text::jsonb = ('{"x":123}'::jsonb)->'x'; = NOT string I need '123' and 'a123' as pure JSONb strings . PS: it is not a duplicate of generic automatic-anything conversion. 回答1: To convert untyped string

问题 I wanted to do batch updates using Springs JDBC template in postgre. However, I am curious that do I really need to use the jdbcTemplate.BatchUpdate() calls. I read in several places that they are slower if not implemented correctly. Will adding a @Transactional on the method that inserts in a loop achieve the same functionality of batching the updates? If the below method that inserts one record at a time, is called from a loop which is in a transactional as shown, will this cause updates to

问题 I have defined my models in JPA and am writing some queries for my application and I am using JOOQ generated classes to join all the tables together to check if the requested resources actually belong to the requesting user. However, when I do this I get the following warning: Ambiguous match found for ID. Both "alias_4548634"."ID" and "alias_47496750"."ID" match. java.sql.SQLWarning: null at org.jooq.impl.Fields.field(Fields.java:132) ~[jooq-3.11.10.jar:?] ... etc This is my code db.select

问题 I have defined my models in JPA and am writing some queries for my application and I am using JOOQ generated classes to join all the tables together to check if the requested resources actually belong to the requesting user. However, when I do this I get the following warning: Ambiguous match found for ID. Both "alias_4548634"."ID" and "alias_47496750"."ID" match. java.sql.SQLWarning: null at org.jooq.impl.Fields.field(Fields.java:132) ~[jooq-3.11.10.jar:?] ... etc This is my code db.select

问题 I have defined my models in JPA and am writing some queries for my application and I am using JOOQ generated classes to join all the tables together to check if the requested resources actually belong to the requesting user. However, when I do this I get the following warning: Ambiguous match found for ID. Both "alias_4548634"."ID" and "alias_47496750"."ID" match. java.sql.SQLWarning: null at org.jooq.impl.Fields.field(Fields.java:132) ~[jooq-3.11.10.jar:?] ... etc This is my code db.select

问题 Is it possible to create "DIRECTORY" object in Postgres? If not can some help me with a solution how implement it on PostgreSQL. 回答1: Not the best option, but you could use: COPY (select 1) TO PROGRAM 'mkdir --mode=777 -p /path/to/your/directory/' Note that only the last part of directory get the permissions set in mode. 回答2: The question doesn't even make sense really. PostgreSQL is a database management system . It doesn't have files and directories. The closest parallel I can think of is