Technically yes, but if a string makes sense to be the primary key then you should probably use it. This all depends on the size of the table you’re making it for and the length of the string that is going to be the primary key (longer strings == harder to compare). I wouldn’t necessarily … Read more
How much writing vs. reading of this table(s) do you expect? I’ve used a single audit table, with columns for Table, Column, OldValue, NewValue, User, and ChangeDateTime – generic enough to work with any other changes in the DB, and while a LOT of data got written to that table, reports on that data were … Read more
You’re probably looking forwith (updlock, holdlock). This will make a select grab an exclusive lock, which is required for updates, instead of a shared lock. The holdlock hint tells SQL Server to keep the lock until the transaction ends. FROM TABLE_ITEM with (updlock, holdlock)
Sure you can. The docs are a little conflicting about this as they also say that no limitations are imposed. I think they should say that relative paths are to the above location and dbs there ARE private. Here is the code you want: File dbfile = new File(“/sdcard/mydb.sqlite” ); SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile, null); … Read more
Very short answer The current dialects as of this writing are: org.hibernate.dialect.MariaDB102Dialect for MariaDB server 10.2 org.hibernate.dialect.MariaDB103Dialect for MariaDB server 10.3 and later, provides sequence support. org.hibernate.dialect.MariaDB10Dialect for MariaDB server 10.0 and 10.1 org.hibernate.dialect.MariaDB53Dialect for MariaDB server 5.3, and later 5.x versions. org.hibernate.dialect.MariaDBDialect for MariaDB server 5.1 and 5.2. Short answer When using a MariaDB … Read more
There is another solution, if you have binary logs active on your server you can use mysqlbinlog generate a sql file with it mysqlbinlog binary_log_file > query_log.sql then search for your missing rows. If you don’t have it active, no other solution. Make backups next time.
Rails supports Single Table Inheritance. From the AR docs: Active Record allows inheritance by storing the name of the class in a column that by default is named “type” (can be changed by overwriting Base.inheritance_column). This means that an inheritance looking like this: class Company < ActiveRecord::Base; end class Firm < Company; end class Client … Read more
The problem, as mentioned, is that you are selecting PEID from two tables, the solution is to specify which PEID do you want, for example SELECT tb.* FROM ( SELECT tb1.PEID,tb2.col1,tb2.col2,tb3.col3 –, and so on FROM vCodesWithPEs as tb1 INNER JOIN vDeriveAvailabilityFromPE as tb2 ON tb1.PROD_PERM = tb2.PEID INNER JOIN PE_PDP tb3 ON tb1.PROD_PERM = … Read more
I recommend you go over Using tables as Queues. Properly implemented queues can handle thousands of concurrent users and service as high as 1/2 Million enqueue/dequeue operations per minute. Until SQL Server 2005 the solution was cumbersome and involved a mixing a SELECT and an UPDATE in a single transaction and give just the right … Read more