Check sqlite database integrity and sqlite database integrity
Recently, a problem occurs: user data is lost. After obtaining the user database file, the database is damaged.
database disk image is malformed
Therefore, we hope to find a method to check whether the database is damaged. After google, we found a method to record it first.
+ (BOOL)checkIntegrity { NSString *databasePath = [self databaseFilePath
Database integrity and constraints, database integrity constraints
Reprint please indicate from Zhu jiayuan http://blog.csdn.net/zhgl7688
Database integrity and constraints
1. Data Integrity: three types of constraints are commonly used to ensure data integrity: domain (col
D2hackmap has an integrity scan function to check whether the game process code has been changed. This function is applicable to d2hackmap's secure open map. The so-called "Safe map opening" principle is to allocate a space in the game process and inject the Code related to the "map opening" (not a complete DLL module) into the space, this code runs under the main thread context of the game. It calls the internal function of the game to implement the
Integrity constraints (Chapter Summary), integrity constraints Chapter Summary1. The Integrity Constraint of the database is a check measure for data updating. One or more constraints exist on a data table.2. constraints are divided into five types: non-NULL constraint (not null), UNIQUE constraint (UNIQUE), primary key constraint (primary key), CHECK constraint
introduction: The previous time experienced the Xcode compiler code was injected into the event, this time mac os X elcapitan system upgrade, enabling a higher security protection mechanism: System Integrity protection systems Integritypro tection (SIP), is by Design? Or is it a coincidence? for System Integrity Protection systems Integrity Protection (SIP), y
Tags: database integrity referential constraint operationsIntegrity of the databaseCorrectness and compatibility of data Data integrity and security are two different conceptsIntegrity of dataPrevents non-conforming data in the database, that is, prevents incorrect data from being present in the databaseObject of protection: non-semantic, incorrect dataSecurity o
Process integrity(ProcessIntegrity)It refers to the ability to manage business activities in a seamless and reliable manner at all levels of a secure and scalable SOA environment.
It mainly includes transaction integrity (transaction Integration), information integration, and interaction integration.
Because of the mature customers of SOA implementation, as the business modularization increases, enterpr
Tags: MySQL data integrityMySQL database Advanced (i)--data integrity first, data integrity Introduction 1, Data integrity IntroductionData redundancy refers to the existence of some duplicate data in the database, data integrity refers to the data in the database can correctly respond to the actual situation.Data
Five phases of file integrity monitoring, file integrity monitoring
If the file integrity monitoring (FIM) solution is deployed well, the benefits are great:
If you see unexpected or uninterpretable file modifications, you can immediately start the investigation: if the investigation finds that the system is intruded, the problem can be quickly solved.
These chan
What are the five types of integrity constraints? Data constraints based on the MySQL database instance, integrity mysqlTo prevent non-conforming data from entering the database, DBMS automatically monitors the data according to certain constraints when you insert, modify, or delete the data, make the non-compliant data unable to enter the database to ensure that the data stored in the database is correct,
Because the database stores data consistently, tables in the database require methods to validate various data types. It is not limited to data types, there are unique values, ranges of values, or the values of a column match the columns in another table.When you define a table, it uses these data validation methods. This is called declaring data integrity. That's what we call table constraints. UsetempdbGOCREATE TABLEs (SidVARCHAR( -), snameVARCHAR(
Label:1 integrity of the dataConstraints are used to ensure the accuracy and consistency of data. The integrity of the data is a guarantee of the accuracy and consistency of the data. Data integrity (Integrity) refers to the accuracy (accuracy) and reliability (reliability) of data. Divided into the following four cate
, employee, manager of personnel and payroll management system, and various business rules.
After completing the search for business rules, determine the business rules to be used as database integrity and categorize the business rules. The integrity design that is part of the database schema is performed in the following procedure. and the database integrity de
Server relational database management systems. these relationships are achieved by defining primary key constraints and foreign key constraints.
Summary
1. Data integrity is enhanced to ensure data accuracy, consistency, and reliability in the database. It can be divided into the following types:
Entity
, employee, manager of personnel and payroll management system, and various business rules.
After completing the search for business rules, determine the business rules to be used as database integrity and categorize the business rules. The integrity design that is part of the database schema is performed in the following procedure. and the database integrity de
Tags: delete auto name PRIMARY KEY constraint Insert build table has a default value ble1. Completeness of data 1. What is the integrity of dataEnsure that the data entered by the user is saved to the database in the correct2. Add Data integrityAdding a constraint to a table when creating a table3. Integrity classificationEntity integrity, domain
the integrity constraints of data are some constraints on the data description, and three types of integrity constraints can be found in the relational data model: Entity integrity, referential integrity, and user-defined integrity
The data in the database is input from outside, and the input is invalid or incorrect for various reasons. Ensuring that the input data meets the requirements has become a top concern for database systems, especially multi-user relational database systems. Therefore, data integrity is proposed. This chapter describes the concept of data integrity and its implementation methods in SQL Server.Data
ensures the rationality of database Field Values. Including restriction type (data type), format (by checking constraints and rules), possible value range (by foreign key constraints, check constraints, default value definitions, non-empty constraints and Rules ), in today's relational DBMS, domain integrity constraints are generally checked.
Entity integrity:
Entity
Tags: c style class blog Code aAuthor: DolphinOriginal address: http://blog.csdn.net/qingdujun/article/details/27109035I. DEFINITION of entity integrity[Example 1] defines the SNO attribute in the student table as a code.CREATE TABLE Student ( Sno char) PRIMARY KEY,/ * in the column Definition Master code * /Sname CHAR (a) not NULL, Sage SMALLINT);Or:CREATE TABLE Student ( Sno char (Ten), Sname char () not NULL, Sage SMALLINT, PRIMARY K
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