*I don’t get value of max in function other. Value return is “0”. I trying but not success 🙁 Image Help!!! Answer You’re not using it as it should be. First of all, you use AVG but want MAX so change it to MAX(GiaSP). Second, you must use rs.next() to have your cursor go to the first r…
Tag: java
“not Implemented by SQLite JDBC driver”
I have a database with User information, and I wanted to make a public static to return the database integers at any given time without having to make a void for every single one, but it’s giving me this error: And this is my code: Does someone understand what I’m doing wrong? I tried to Google th…
SQLQuery.list() returns the same entries
In my java code I have written like this. This query returning same records again and again. But in database I have only single record. String queryString = “select e.business_event_id, e.event_name …
Hibernate @GeneratedValue null error for primary key
I am using Hibernate to save an object in the database. I am generating my primary key with @GeneratedValue annotation. Here is my code Vendor class I am using MS SQL Server 2012 where I have a vendor table with following columns Unchecked means its NOTNULL = true, it doesnt allow null values. Here is the cod…
Hibernate Check Annotation
I have a table with three fields, say a, b, c. I would like to add a constraint ensuring that if a is not null, then also b and c are not null. I have done that using following SQL Is there a way to achieve same effect using hibernate annotation @Check? I can’t find a helpful example with that
CSVJDBC – Interpreting Strings Instead of Integers in Aggregate Functions
I am using the CSVJDBC driver for retrieving results from CSV files. All record fields are interpreted as Strings. How can I utilise the MAX aggregate function in order to obtain the maximim Integer of a column? As far as I know, csvjdbc does not support casting. Consider this sample file: I use the following…
Reuse a parameter in a PreparedStatement?
I am passing a parameter to a PreparedStatement like this : And the query looks like this : Now I want to modify my query like this, and reuse the first parameter (both ? would use the runId parameter) : Is that possible without doing this : Answer This cannot be done with plain JDBC. You could instead use Sp…
Catch SQL RaiseError in jsp
I am developing a database and some JSP Pages to perform CRUD operations on it. I cannot catch exceptions related to my SQL Code in my JSP Code. For Example: I have this part of code where I raise an error in T-SQL: I need to call the function where I raise those errors in JSP code. Heres a part
java.sql.SQLException: Field ‘id’ doesn’t have a default value
I am trying to insert data into arrivaltimes tables but I am getting the following error: java.sql.SQLException: Field ‘id’ doesn’t have a default value Answer You are missing AUTO INCREMENT for Primary Key in arrivaltimes table. Just need to add AUTO_INCREMENT while creating table
Why does Hibernate generate a CROSS JOIN for an implicit join of a @ManyToOne association?
Baur & King said in their book: Implicit joins are always directed along many-to-one or one-to-one association, never through a collection-valued association. [P 646, Ch 14] But when I am doing that in the code it is generating a CROSS JOIN instead of an INNER JOIN. Mapping is from Member2 (many-to-one) -…