tp5 database - chaining

Chaining

Chaining method provided by the database, can effectively improve the development efficiency and clarity of code data access, and supports all CURD operations.

Using relatively simple, if we now want to query a User table of state meet for the first 10 records 1, and want to follow the creation time of the user's sort code is as follows:

Db::table('think_user')
    ->where('status',1)
    ->order('create_time')
    ->limit(10)
    ->select();

Here where, orderand limitthe method was called chaining method, except that the method must select the last placed outside (because the select method is not chaining method), a method of operation of the chain has no calling sequence, for example, the following and the above equivalent code is:

Db::table('think_user')
    ->order('create_time')
    ->limit(10)
    ->where('status',1)
    ->select();

In fact, not only you can use the query methods consistent operations, including all CURD methods can be used, for example:

Db::table('think_user')
    ->where('id',1)
    ->field('id,name,email')
    ->find(); 
Db::table('think_user')
    ->where('status',1)
    ->where('id',1)
    ->delete();

Chain automatically clears all by value chain operations after the completion of inquiry. In short, the results of operations of the chain will not inquire into the back of the other.

The system supports chaining methods are:

Coherent operation	effect	Supported parameter types
where*	AND for query	Strings, arrays and objects
whereOr*	Queries for OR	Strings, arrays and objects
wheretime*	Time for quick and easy reference date	String
table	Defines the name of a data table to be operated	Strings and arrays
alias	The current data table is used to define an alias	String
field*	Is used to define the fields you want to query (support field excluded)	Strings and arrays
order*	It used to sort the results	Strings and arrays
limit	Used to limit the number of query results	Strings and numbers
page	Used to query paging (internal converted into limit)	Strings and numbers
group	For group support for query	String
having	Support for having the query	String
join*	Support for join queries	Strings and arrays
union*	For union support for queries	Strings, arrays and objects
view*	To view query	Strings, arrays
distinct	Support for distinct queries	Boolean value
lock	For the locking mechanism of the database	Boolean value
cache	For query cache	Support for multiple parameters
relation*	For related queries	String
with*	Association for preloading	Strings, arrays
bind*	Data for the binding operation	Array or more parameters
comment	For SQL comment	String
force	Force index for the data set	String
master	Reading data for setting the master	Boolean value
strict	Whether to set strict detection field name exists	Boolean value
sequence	Increment sequence for setting the name of Pgsql	String
failException	Whether or not to set the query to the data thrown	Boolean value
partition	Information for setting a sub-table	Array of strings

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

All operations are consistent returns the current instance of the object model (this), in which marked with * support multiple calls.