Lazy loading only queries when accessing associations can easily lead to N 1 problems, which is suitable for scenarios where the associated data is not determined whether it is needed; 2. Emergency loading uses with() to load associated data in advance to avoid N 1 queries, which is suitable for batch processing scenarios; 3. Emergency loading should be used to optimize performance, and N 1 problems can be detected through tools such as LaravelDebugbar, and the $with attribute of the model is carefully used to avoid unnecessary performance overhead.

UseaRESTAPItobridgePHPandMLmodelsbyrunningthemodelinPythonviaFlaskorFastAPIandcallingitfromPHPusingcURLorGuzzle.2.RunPythonscriptsdirectlyfromPHPusingexec()orshell_exec()forsimple,low-trafficusecases,thoughthisapproachhassecurityandperformancelimitat

Laravel supports the use of native SQL queries, but parameter binding should be preferred to ensure safety; 1. Use DB::select() to execute SELECT queries with parameter binding to prevent SQL injection; 2. Use DB::update() to perform UPDATE operations and return the number of rows affected; 3. Use DB::insert() to insert data; 4. Use DB::delete() to delete data; 5. Use DB::statement() to execute SQL statements without result sets such as CREATE, ALTER, etc.; 6. It is recommended to use whereRaw, selectRaw and other methods in QueryBuilder to combine native expressions to improve security

Responsive programming implements high concurrency, low latency non-blocking services in Java through ProjectReactor and SpringWebFlux. 1. ProjectReactor provides two core types: Mono and Flux, supports declarative processing of asynchronous data flows, and converts, filters and other operations through operator chains; 2. SpringWebFlux is built on Reactor, supports two programming models: annotation and functional. It runs on non-blocking servers such as Netty, and can efficiently handle a large number of concurrent connections; 3. Using WebFlux Reactor can improve the concurrency capability and resource utilization in I/O-intensive scenarios, and naturally supports SSE and WebSo.

MapStruct is a compile-time code generator used to simplify mapping between JavaBeans. 1. It automatically generates implementation classes by defining interfaces to avoid manually writing lengthy set/get mapping code; 2. It has type-safe, no runtime overhead, supports automatic mapping of the same name fields, custom expressions, nested objects and collection mapping; 3. It can be integrated with Spring and uses @Mapper(componentModel="spring") to inject mapper into Springbean; 4. Simple configuration, just introduce mapstruct dependencies and annotationProcessorPaths inserts

Python's ternary operator is used to concisely implement if-else judgment, and its syntax is "value_if_trueif conditionelsevalue_if_false"; 1. It can be used for simple assignment, such as returning the corresponding string based on positive and negative values; 2. It can avoid division errors, such as determining that the denominator is non-zero and then division; 3. It can select content according to conditions in string format; 4. It can assign labels to different elements in list derivation formula; it should be noted that this operator is only suitable for binary branches and should not be nested multiple layers. Complex logic should use the traditional if-elif-else structure to ensure readability.

Go generics are supported since 1.18 and are used to write generic code for type-safe. 1. The generic function PrintSlice[Tany](s[]T) can print slices of any type, such as []int or []string. 2. Through type constraint Number limits T to numeric types such as int and float, Sum[TNumber](slice[]T)T safe summation is realized. 3. The generic structure typeBox[Tany]struct{ValueT} can encapsulate any type value and be used with the NewBox[Tany](vT)*Box[T] constructor. 4. Add Set(vT) and Get()T methods to Box[T] without

table-layout:fixed will force the table column width to be determined by the cell width of the first row to avoid the content affecting the layout. 1. Set table-layout:fixed and specify the table width; 2. Set the specific column width ratio for the first row th/td; 3. Use white-space:nowrap, overflow:hidden and text-overflow:ellipsis to control text overflow; 4. Applicable to background management, data reports and other scenarios that require stable layout and high-performance rendering, which can effectively prevent layout jitter and improve rendering efficiency.