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We welcome all types of contributions!
The most common type of contribution is to fix an incorrect SQL generation for a database grammar.
To debug what SQL is being ran, you can always call toSQL
on any QueryBuilder
or SchemaBuilder
object. Additionally, you can listen to the preQBExecute
interception point for the generated SQL.
Each of the database grammars have two tests — {Grammar}QueryBuilderSpec.cfc
and {Grammar}SchemaBuilderSpec.cfc
. These tests run the same qb syntax across the different grammars. In each test are methods that return SQL strings like so:
If you find an issue with the SQL generated from a grammar, please file a pull request with the correct SQL in these tests. It's okay if you don't submit a fix as well. (But we'd greatly appreciate it!) Doing so will help expedite the fix.
If you want to add support for a new database grammar, simply copy these two tests from an existing grammar, rename them, change the getBuilder
method to return your new grammar, and fill out the SQL as it should be. That will guide your implementation to be 100% compatible with the other grammars in qb.
when
callbacksThis isn't a breaking change that will affect most people. In fact, it will most likely improve your code.
Previously, when using the when
control flow function, you were fully responsible for the wrapping of your where statements. For example, the following query:
Would generate the following SQL:
The problem with this statement is that the OR
can short circuit the active
check.
The fix is to wrap the LIKE
statements in parenthesis. This is done in qb using a function callback to where
.
When using the when
control flow function, it was easy to miss this. This is because you are already in a closure - it looks the same as when using where
to group the clauses.
In qb 8.0.0, when
will automatically group added where clauses when needed. That means our original example now produces the SQL we probably expected.
Grouping is not needed if there is no OR
combinator. In these cases no grouping is added.
If you had already wrapped your expression in a group inside the when
callback, nothing changes. Your code works as before. The OR
combinator check only works on the top most level of added where clauses.
Additionally, if you do not add any where clauses inside a when
callback, nothing changes from qb 7.
The breaking change part is if you were relying on these statements residing at the same level without grouping. In those cases, you may pass the withoutScoping
flag to the when
callback.
Support for Lucee 4.5 and Adobe ColdFusion 11 has been dropped. If you need support for these engines, please remain on an earlier version of qb.
MSSQLGrammar
was visually too close to MySQLGrammar
and was hard to differentiate quickly. SqlServerGrammar
is much more unique and easily identifiable. Additionally, more people that use this library refer to their database engine as "SQL Server" than "MSSQL".
To migrate, replace any instances of MSSQLGrammar
with SqlServerGrammar
. Make sure to also append the @qb
namespace, if needed, as explained below.
Variadic parameter support was the ability to pass any number of arguments to certain methods like select
.
This code came with a slight performance cost and readability cost. That, combined with the fact that the above syntax is very close to an array, we are dropping support for variadic parameters. To migrate, wrap instances of variadic parameters in an array:
In previous versions, the value passed to defaultGrammar
was used to look up a mapping in the @qb
namespace. This made it difficult to add or use grammars that weren't part of qb. (You could get around this be registering your custom grammar in the @qb
namespace, but doing so seemed strange.)
To migrate this code, change your defaultGrammar
to be the full WireBox mapping in your moduleSettings
:
A defaultValue
parameter and optional exception throwing was added to value
. This pushed the options
struct to the end of the method. If you are using positional parameters with value
, you will need to update your method calls to either use named parameters or the new positions.
callback
to query
All methods that could conceivably take a subquery as well as a value now accept a closure or another builder instance to use as a subquery. This led to changing the callback
argument to query
in the following cases:
whereSub
whereInSub
whereExists
orWhereExists
whereNotExists
andWhereNotExists
orWhereNotExists
whereNullSub
orderBySub
subSelect
If you are using named parameters with any of the above methods you will need to migrate your method calls.
Version v5.0.0
brings support for SchemaBuilder
inside qb
. To avoid naming confusion, Builder
was renamed to QueryBuilder
. Any references in your code to Builder@qb
need to be updated to QueryBuilder@qb
.
Installation is easy through and . Simply type box install qb
to get started.
To start a new query, instantiate a new Builder: wirebox.getInstance('QueryBuilder@qb')
.
By default, qb uses a generic Grammar. You can specify your specific grammar in ColdBox by setting the defaultGrammar
in your moduleSettings
.
The grammars provided by qb are:
MySQLGrammar
OracleGrammar
PostgresGrammar
SqlServerGrammar
If you are not using WireBox, just make sure to wire up the Builder
object with the correct grammar:
QB binds all parameters by default and guesses the SQL type based on passed values. The default SQL type for numeric values is CF_SQL_NUMERIC
, which is a floating point number, for the widest compatibility. This can cause performance problems with large recordsets in some database engines. You can provide a different default in coldbox.cfc if you wish to override this setting:
Note: These instructions assume a basic knowledge of FW/1, a working FW/1 application structure with qb installed in the
/subsystems
directory (manually or via CommandBox), and a database configured to run with your application.
Once the application structure is setup, now we need to wire up qb to a bean factory using DI/1.
First we will add a mapping in Application.cfc
.
Next we need to tell DI/1 where qb's components are and how to reference them for later use in the application. We can do so by defining the configuration settings in the variables.framework.subsystems
struct in Application.cfc
. The example below makes use of a load listener to declare each component instance and pass in any constructor arguments.
Now that everything is configured, you can launch your application with CommandBox by entering start
in the terminal or use whatever method you're accustomed to.
To access qb from your application's code, you can call on it by using getBeanFactory()
.