The SchemaUpdate object provides database schema updating, by apparently generating and executing a series of SQL UPDATE statements (as well as constraint statements) when it’s void Execute(bool script, bool doUpdate) function is called. The SchemaUpdate class is in the NHibernate.Tool.hbm2ddl namespace, which can be found in the Nhibernate.dll file. SchemaUpdate is mentioned in chapter 15 … Read more
Try this: { “description” : “schema validating people and vehicles”, “type” : “object”, “oneOf” : [ { “type” : “object”, “properties” : { “firstName” : { “type” : “string” }, “lastName” : { “type” : “string” }, “sport” : { “type” : “string” } } }, { “type” : “object”, “properties” : { “vehicle” : … Read more
All fields in a mongoose schema are optional by default (besides _id, of course). A field is only required if you add required: true to its definition. So define your schema as the superset of all possible fields, adding required: true to the fields that are required.
You can spool the schema out to a file via SQL*Plus and dbms_metadata package. Then replace the schema name with another one via sed. This works for Oracle 10 and higher. sqlplus<<EOF set long 100000 set head off set echo off set pagesize 0 set verify off set feedback off spool schema.out select dbms_metadata.get_ddl(object_type, object_name, … Read more
SELECT TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, COLLATION_NAME FROM INFORMATION_SCHEMA.COLUMNS
Performance isn’t worse, necessarily. As the article explains, there are specific conditions which make the schema approach better or worse depending on your application design and workload. Let me explain the tradeoffs of the “tenant-schema” vs. “shared-table” approaches: tenant-schema is best when you have a relatively small number of fairly large tenants. An example of … Read more
Basically it references another element that is declared elsewhere, which may or may not be the same schema document. For instance, it could come from an externally referenced schema in a different namespace. Suppose you use the item element a lot in several different schemas, you can declare it (and any other common types and … Read more
If you have a large number of objects in a schema, you can use something like this to generate all the changes automatically (it only does tables and views, so before you run it, you might need to expand it to SPs, UDFs, etc.) USE SandBox DECLARE @OldSchema AS varchar(255) DECLARE @NewSchema AS varchar(255) DECLARE … Read more
Postgres psql needs escaping for capital letters. Eonil=# \d+ “TestTable1” So this works well. Eonil=# \d+ “TestTable1” Table “public.TestTable1” Column | Type | Modifiers | Storage | Description ——–+——————+———–+———-+————- ID | bigint | not null | plain | name | text | | extended | price | double precision | | plain | Indexes: “TestTable1_pkey” … Read more
Use rake db:structure:load, which will load db/structure.sql. [Update] If you want to load another file, you can specify its path via SCHEMA environment variable (Rails 5.0 or later) DB_STRUCTURE environment variable (Rails 4.x) For example, run rake db:structure:load SCHEMA=db/another.sql or rake db:structure:load DB_STRUCTURE=db/another.sql