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[Conversion] CoreData and MagicalRecord (1), magicalrecord First, let's take a rough look at some core concepts in CoreData.1. core concepts of CoreData First, let's look at two key concepts. (1) NSManagedObjectModel the managed Object Model (MOM) describes the data model of an application. This model includes Entity, Property, and FetchRequest. This MOM is described by an object, that isNSEntityDescriptionThe collection of instances. For more information about Object Description objects, see

Excerpt from: http://blog.csdn.net/lincheng15/article/details/51789093To summarize: Multiplexing is a pin with several functions, 1. Do normal IO input and output 2. Input and output of other peripherals (such as I2C,TIM,SPI, etc.), this is reuse.Remapping is the PIN function redefined to other pins, such as PA9 is the USART1-TX default PIN, but now PA9 used for it, that can be usart1-tx remapped to PB6, of course, this mapping is not arbitrary to map to which foot on which foot, The inside of t

: Counter overflow/down overflow, counter initialized (via software or internal/external trigger) b. Trigger events (counters start, stop, initialize, or internal/external trigger count) c. The input captures the d. Output comparison e. Supports incremental (quadrature) encoders for positioning and Hall sensor circuits f. Trigger input as an external clock or as a cycle current management This experiment is an update interrupt for TIM3.TIM3 Related configuration Files timer.c#

is an iterative process of continuous improvement, in the software development process, small and medium IT enterprises, according to their own resources, especially the development team's human resources, SDLC can be divided into the following four phases from the perspective of accelerating development, ensuring product quality, and facilitating communication and coordination with customers: requirement Analysis, software implementation, system deployment, and system maintenance. 1. The divis

first, sizeof gets the number of bytes of an object or type 1. General type char, int, long, double, etc. Number of bytes returned and system-related 2. Pointer type The pointer type is actually the address, 32 is the number of bytes in the system is 4 3, array Array bytes equal to array type byte number * length of array 4, struct A multiple of the total number of bytes occupied by the largest member, and the total number of bytes for all members before the maximum member, and must be a mul

convergence. GMPLS is an extension of mpls-te As noted earlier, GMPLS employs a peer-to-peer model, developed on the basis of MPLS, and, more accurately, Gmpls is mpls-te extension, Mpls-te is an extension protocol for MPLS-supported traffic engineering, and the GMPLS's core extension is: An MPLS or Mpls-te control plane that only provides packet switching (PSC) and second-tier switching (L2SC) interfaces. GMPLS expands the interface of this contr

Handle Simple Connection Connection Object Execute (connectioncallback action) Handling static Queries statement Object Execute (statementcallback action)void execute (String sql)Object query (String sql, ResultSetExtractor rse)void query (String sql, RowCallbackHandler rch)List query (String sql, RowMapper rowmapper)Object queryForObject (String sql, RowMapper rowmapper)Object queryForObject (String sql, Class requiredtype)Map queryForMap (String sql)Long queryF

* psc = [[NSPersistentStoreCoordinatoralloc] initWithManagedObjectModel: model]; // Obtain the sandbox path NSString * path = [NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES) firstObject]; Path = [path stringByAppendingPathComponent: @ "coreData. sqlite"]; NSLog (@ "% @", path ); NSURL * url = [[NSURLalloc] initFileURLWithPath: path]; // Load the basic library path and basic library type for the Coordinator [

configure the timer simple function actually only need two parameters: prescaler frequency and auto Reload value Tout = ((arr+1) * (psc+1))/tclk; Where arr is the automatic reload value, the PSC is the Prescaler value, and the TCLK is the timer clock.For example, I want the 1s clock timer, you can set: Arr =9999;psc=8399;Notice the value range of ARR and

Everyone has used the JdbcTemplate Execute method, execute acts as the core portal of database operations, encapsulates the same steps for most database operations, and uses parameters PreparedStatementCallback callbacks for personalized operations. Publicaction)throwsDataAccessException {assert.notnull (PSC,"PreparedStatementCreator must not being null"); Assert.notnull (Action,"Callback object must not being null"); if(logger.isdebugenabled ()) {Str

, // parent window0, 0, // ReservedFilterinfo. achname, // caption for the dialog box1, // number of objects (just the filter) Pfilterunk, // array of object pointers.Caguid. celems, // number of property pagesCaguid. pelems, // array of property page clsids0, // Locale identifier0, NULL // Reserved); // Clean up.PFilterUnk-> Release ();FilterInfo. pGraph-> Release ();CoTaskMemFree (caGUID. pElems );} The following function code is used to open and set the pin property page. Void CVideoCap1Dlg:

Handling Simple Connection Connection Object Execute (connectioncallback action) Handling static Queries statement Object Execute (statementcallback action)void execute (String sql)Object query (String sql, ResultSetExtractor rse)void query (String sql, RowCallbackHandler rch)List query (String sql, RowMapper rowmapper)Object queryForObject (String sql, RowMapper rowmapper)Object queryForObject (String sql, Class requiredtype)Map queryForMap (String sql)Long quer

. This interface defines a set of JDBC operations, most of which use callbacks to define operations. Here is the definition of the method, which can basically be read as a SPRINGJDBC document. Operation JdbcOperations method definition Handling Simple Connection Connection Object Execute (connectioncallback action) Handling static Queries statement Object Execute (statementcallback action)void execute (String sql)Object query (String

Introduction to input CaptureThe input capture mode can be used to measure the pulse width or measurement frequency. STM32 timers, in addition to TIM6 and TIM7, have input capture capabilities for other timers.STM32 input capture, simply by detecting the edge signal on the TIMX_CHX, when the edge signal jumps (such as rising edge/falling edge), the value of the moment timer (timx_cnt) stored in the corresponding channel capture/comparison register (TIMX_CCRX) inside, Complete one capture.To use

STM32 external pulse ETR pin:tim1-->pa12; timer2-->pa0;timer3-->pd2; TIMER4-->PE0 ...1.TIM2 PA0 Count Configuration steps① turn on TIM2 clock, configure PA0 inputAPB1 Peripheral Reset Register (RCC_APB1RSTR)APB2 Peripheral Clock Enable register (RCC_APB2ENR)Set 1 to open. Clear 0 closed.eg:rcc->apb1enr|=1rcc->apb2enr|=1//enable Porta clockConfiguring I/O ports: See Stm32 Register Edition Learning Note the configuration of the Gpio port.eg:gpioa->crl=0xfffffff0; PA0 before clearing the settingsGP

CPU, do not only consider the clock speed. The CPU clock speed of the computer does not represent everything. For example, the clock speed of 630 is 3.0, but it is not 820 (clock speed 2.8) expensive, why is it that the CPU is effective? Think about other things and you will get twice the result with half the effort. At the same time, you must be careful about JavaScript deception. Please be careful when using low-price CPU but same-frequency CPU. High-speed hyper-threading

1. Function and principle The basic timers TIM6 and TIM7 each contain a 16-bit automatic load counter, which is driven by the respective programmable prescaler. They can provide a time base as a general-purpose timer, especially for a digital-to-analog converter (DAC). In fact, they connect directly to the DAC inside the chip and drive the DAC directly through the trigger output. These 2 timers are independent of each other and do not share any resources. The graph shows that its clock source c

Human resource management includes human resource planning, Project Unity, project team building, project team management process1. Development of human resources planning Human Resource planning is the process of determining the role and responsibilities of a project to report relationships. input to human resources planning: Activity resource estimation, environmental and organizational factors, project management plan Tools and techniques for human resource planning: Organizational chart and

arrows, refine the main classification, and identify the cause of the problem.Trend analysis: Involves the use of mathematical techniques to predict future outcomes based on historical results. Can be used to track changes in variables over time and are often used for monitoring.Histogram is also called bar graph, mass distribution map, rectangle chart, frequency distributionLet's snack.6σ Management Law, the general enterprise's failure rate is about 3-4σ.3. Human Resource ManagementHuman reso

results.Tools and Techniques: inspection, control charts, Pareto charts, statistical sampling, flow charts, trend analysis diagrams, bug fixes, histograms, scatter charts, 6 sigma Management law.Output: Recommended corrective action recommended preventative measures, request for changes, recommended bug fixes. A confirmed bug fix. Update the project management plan, quality control metrics, and update the organizational process assets.Key knowledge of Project human resource management:Including