oracle11g

问题 On Oracle 11g I'm trying to create a materialized view with FAST REFRESH ON COMMIT that contains a HAVING clause. The Database Data Warehousing Guide says: General Restrictions on Fast Refresh The defining query of the materialized view is restricted as follows: It cannot contain a HAVING clause with a subquery. But if I add HAVING count(*)>1 (note: no subquery) to an otherwise working materialized view, I get this error: ORA-12054: cannot set the ON COMMIT refresh attribute for the

问题 I tried setting oracle.net.READ_TIMEOUT as connection properties but it seems like it is not working, however setting oracle.jdbc.ReadTimeout works. Any idea why? I am using 11g JDBC Drivers. And the DB server version is 11g. 回答1: According to http://www.javamonamour.org/2012/09/oraclenetconnecttimeout.html oracle.net.READ_TIMEOUT for jdbc versions < 10.1.0.5 oracle.jdbc.ReadTimeout for jdbc versions >=10.1.0.5 So if you are using a JDBC driver version 10.1.0.5 or higher, then oracle.jdbc

问题 Can I convert an oracle BLOB to Base64 CLOB in One go? like: CREATE TABLE test ( image BLOB, imageBase64 CLOB ); INSERT INTO test(image) VALUES (LOAD_FILE('/full/path/to/new/image.jpg')); UPDATE test SET imageBase64 = UTL_ENCODE.base64_encode(image); commit; I know I can add functions/Stored proc to do the work. Performance aspect is very important,so I am asking if there is a way to overcome the 32K limitation by directly pushing the data into a CLOB. 回答1: Provided that stored procs would

问题 Can I convert an oracle BLOB to Base64 CLOB in One go? like: CREATE TABLE test ( image BLOB, imageBase64 CLOB ); INSERT INTO test(image) VALUES (LOAD_FILE('/full/path/to/new/image.jpg')); UPDATE test SET imageBase64 = UTL_ENCODE.base64_encode(image); commit; I know I can add functions/Stored proc to do the work. Performance aspect is very important,so I am asking if there is a way to overcome the 32K limitation by directly pushing the data into a CLOB. 回答1: Provided that stored procs would

问题 How can I loop through an implicit cursor which is created, for example, from a query? Here is the sample code: SERVEROUTPUT on; DECLARE TYPE ref_cursor IS REF CURSOR; cur REF_CURSOR; BEGIN OPEN cur FOR 'SELECT i.item_no, i.item_descr FROM ITEMS i WHERE i.item_no in (1,2,3)'; ... loop statement to print all item descriptions? END; 回答1: Here's how to do it allowing for dynamic SQL. You can build the query string up in code however needed (usual warnings about SQL injection apply). DECLARE TYPE

问题 I have hundreds of stored procedures and i want to find out the name of the procedure which uses the particular column name in query 回答1: This will do it, but might produce false positives for generic column names SELECT DISTINCT type, name FROM dba_source WHERE owner = 'OWNER' AND text LIKE '%COLUMN_NAME%'; where OWNER is the schema which owns the stored procedures you want to search and COLUMN_NAME is the column name that you want to find. If you don't use mixed case column names then you

问题 How can I loop through an implicit cursor which is created, for example, from a query? Here is the sample code: SERVEROUTPUT on; DECLARE TYPE ref_cursor IS REF CURSOR; cur REF_CURSOR; BEGIN OPEN cur FOR 'SELECT i.item_no, i.item_descr FROM ITEMS i WHERE i.item_no in (1,2,3)'; ... loop statement to print all item descriptions? END; 回答1: Here's how to do it allowing for dynamic SQL. You can build the query string up in code however needed (usual warnings about SQL injection apply). DECLARE TYPE

问题 I am using the javax.persistence API and Hibernate to create annotations and persist entities and their attributes in an Oracle 11g Express database. I have the following attribute in an entity: @Column(precision = 12, scale = 9) private BigDecimal weightedScore; The goal is to persist a decimal value with a maximum of 12 digits and a maximum of 9 of those digits to the right of the decimal place. After calculating weightedScore , the result is 0.1234, but once I commit the entity with the

问题 I am using the javax.persistence API and Hibernate to create annotations and persist entities and their attributes in an Oracle 11g Express database. I have the following attribute in an entity: @Column(precision = 12, scale = 9) private BigDecimal weightedScore; The goal is to persist a decimal value with a maximum of 12 digits and a maximum of 9 of those digits to the right of the decimal place. After calculating weightedScore , the result is 0.1234, but once I commit the entity with the

问题 I need to parse a text field (Description), delimited by '\n', into three separate fields. I am doing this by utilizing substr and instr , but it results in difficult to read and repetitive sql. Is there a way to create and use a variable or expression to hold the "position" value returned by the instring function so I can pass that variable to substr instead? My code posted below functions and returns the correct results, but it doesn't feel right. There's a lot of duplication. Relevant Raw