Creating an question/answer test application that scores you based on how many attempts it took to get it right (i.e on the first attempt 5 points, 2nd attempt 4 points… and so on) the questions are stored in a .DB file in asset folder and after testing the scoring logic I’m now trying to draw fro…
Tag: java
Is insert.addBatch() accessible outside of this for loop?
I have multiple for loops where I am setting the values to be inserted into a MySQL DB. My question is will insert.addBatch(); detect the insert values if it is outside of the for loop. Below is an …
Cursor based pagination for table without a unique and sequential id column?
I’m investigating using cursor-based pagination. I have the following (postgres) table: and had begun to sketch out the pagination query (not tested): I’ve been reading these posts: https://slack.engineering/evolving-api-pagination-at-slack-1c1f644f8e12 https://engineering.mixmax.com/blog/api-pagi…
H2 database – Update from select sets out-of-date data after h2database upgrade to version 1.4.198
We have a simple counter in out project database. Until now we were using version 1.4.197 of H2 database. Executing below example snippet with this version always imply counter to be 5000. Upgrade to version 1.4.198 or above makes below code returning inconsistent results, usually between 1500 and 2000. My as…
How setting Auto Commit off, helps to start a transaction in JDBC?
Many articles and documents says that by setting Auto Commit off, You can start a transaction in JDBC. This Topic also ask same question but It doesn’t answer to the question and just said: …
Why do I fail to save data in my application?
I am a student and started working on android studio recently. I don’t know about it much. I am working on an application where I save the item name and its amount in the database and display toast …
Using classes from /target
I am using JOOQ. JOOQ generates meta classes, using with database requests. It’s recommended to generate classes into /target/generated-sources/jooq. But when I try to call these meta classes in code, they are not accessible. Please, tell me what to do. Answer This is the default output location because…
How to Join two columns in same table
SELECT CAST(`last_charged_date` AS DATE) AS Date_time, COUNT(*) AS Charged_Count, SUM(last_charge_amt) AS Revenue FROM subscriber GROUP BY CAST(last_charged_date AS DATE) SELECT CAST(…
Using Java, update an exisitng SQL table row from Excel Sheet
I am using apache Poi to pull data from an excel sheet that’s uploaded to the server. The object is to pull the excel data, which has four columns (clientId, clientName, monthlyMinimum, setUpFee), and update an existing row’s monthly minimum & set up fee, based off the clientId, in an existing…
SQL Query text formation logic after where condition
i need to generate a SQL Query using logic implemented in java, After WHERE conditions there can be multiple comparitions using AND OR NOT, eg: WHERE column1 = ‘xyz’ and column2 = 2 or column1 = ‘…