Access使用宏控制程序 3.在宏中使用条件
在某些情况下，可能希望仅当特定条件为真时才在宏中执行一个或多个操作。例如，如果在某个窗体中使用宏来校验数据，可能要显示相应的信息来响应记录的某些输入值，另一信息来响应另一些不同的值。在这种情况下，可以使用条件来控制宏的流程。 条件是逻辑表达式。宏将根据条件结果的真或假而沿着不同的路径执行。如果这个条件结果为真，则 Microsoft Access 将执行此行中的操作。在紧跟此操作的操作的“条件”栏内键入省略号（…），就可以使 Microsoft Access 在条件为真时可以执行这些操作；如果这个条件式的结果为假，Microsoft Access 则会忽略这个操作以及紧接着此操作且在“条件”字段内有省略号（…）的操作，并且移到下一个包含其他条件或空“条件”字段的操作。
建立一个窗体，添加一个文本框，命名为“输入数字文本框”，再添加一个确定按钮。 单击确定按钮属性的事件/单击右边的生成器按钮，选择建立宏，并为宏起一个宏名，如“宏3”。
上图是宏3的设计视图。这个宏将实现根据用户在[输入数字文本框]中输入的不同数字显示不同的消息。 单击工具栏上的“条件”按钮
，为宏添加条件列。 图中第一行表示当 0 这是窗体运行时的效果，当输入了一个数字 15 ，将显示如图的消息框
What Are the Limitations of Using Views in MySQL?May 14, 2025 am 12:10 AMMySQLviewshavelimitations:1)Theydon'tsupportallSQLoperations,restrictingdatamanipulationthroughviewswithjoinsorsubqueries.2)Theycanimpactperformance,especiallywithcomplexqueriesorlargedatasets.3)Viewsdon'tstoredata,potentiallyleadingtooutdatedinforma
Securing Your MySQL Database: Adding Users and Granting PrivilegesMay 14, 2025 am 12:09 AMProperusermanagementinMySQLiscrucialforenhancingsecurityandensuringefficientdatabaseoperation.1)UseCREATEUSERtoaddusers,specifyingconnectionsourcewith@'localhost'or@'%'.2)GrantspecificprivilegeswithGRANT,usingleastprivilegeprincipletominimizerisks.3)
What Factors Influence the Number of Triggers I Can Use in MySQL?May 14, 2025 am 12:08 AMMySQLdoesn'timposeahardlimitontriggers,butpracticalfactorsdeterminetheireffectiveuse:1)Serverconfigurationimpactstriggermanagement;2)Complextriggersincreasesystemload;3)Largertablesslowtriggerperformance;4)Highconcurrencycancausetriggercontention;5)M
MySQL: Is it safe to store BLOB?May 14, 2025 am 12:07 AMYes,it'ssafetostoreBLOBdatainMySQL,butconsiderthesefactors:1)StorageSpace:BLOBscanconsumesignificantspace,potentiallyincreasingcostsandslowingperformance.2)Performance:LargerrowsizesduetoBLOBsmayslowdownqueries.3)BackupandRecovery:Theseprocessescanbe
MySQL: Adding a user through a PHP web interfaceMay 14, 2025 am 12:04 AMAdding MySQL users through the PHP web interface can use MySQLi extensions. The steps are as follows: 1. Connect to the MySQL database and use the MySQLi extension. 2. Create a user, use the CREATEUSER statement, and use the PASSWORD() function to encrypt the password. 3. Prevent SQL injection and use the mysqli_real_escape_string() function to process user input. 4. Assign permissions to new users and use the GRANT statement.
MySQL: BLOB and other no-sql storage, what are the differences?May 13, 2025 am 12:14 AMMySQL'sBLOBissuitableforstoringbinarydatawithinarelationaldatabase,whileNoSQLoptionslikeMongoDB,Redis,andCassandraofferflexible,scalablesolutionsforunstructureddata.BLOBissimplerbutcanslowdownperformancewithlargedata;NoSQLprovidesbetterscalabilityand
MySQL Add User: Syntax, Options, and Security Best PracticesMay 13, 2025 am 12:12 AMToaddauserinMySQL,use:CREATEUSER'username'@'host'IDENTIFIEDBY'password';Here'showtodoitsecurely:1)Choosethehostcarefullytocontrolaccess.2)SetresourcelimitswithoptionslikeMAX_QUERIES_PER_HOUR.3)Usestrong,uniquepasswords.4)EnforceSSL/TLSconnectionswith
MySQL: How to avoid String Data Types common mistakes?May 13, 2025 am 12:09 AMToavoidcommonmistakeswithstringdatatypesinMySQL,understandstringtypenuances,choosetherighttype,andmanageencodingandcollationsettingseffectively.1)UseCHARforfixed-lengthstrings,VARCHARforvariable-length,andTEXT/BLOBforlargerdata.2)Setcorrectcharacters
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
SublimeText3 English version
Recommended: Win version, supports code prompts!
MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.
SublimeText3 Linux new version
SublimeText3 Linux latest version
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
