开发环境：
系统：Windows 10 64 bit
引擎：Unreal Engine 5.1.1
IDE：JetBrains Rider 2023.2.1
语言：C++
工具：DB Browser for SQLiteSQLite数据类型：
//INTEGER TEXT BLOB REAL NUMERIC/*integer --->整数，可以是1、2、3、4、6或8个字节，SQLite会根据数值大小自动调整。real --->实数(浮点数)，一律使用8个字节存储text --->文本，最大支持长度为1,000,000,000个字符的单个字符串blob --->二进制对象，最大支持长度为1,000,000,000个字节null --->没有值char(size) --->固定长度的字符串，size规定字符串的长度varchar(size) --->可变长度的字符串，size规定字符串的最大字符个数*/启用插件：
添加插件模块引用："SQLiteCore","SQLiteSupport"
// Copyright Epic Games, Inc. All Rights Reserved.using UnrealBuildTool;public class PakFramework : ModuleRules
{public PakFramework(ReadOnlyTargetRules Target) : base(Target){PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "UMG","SQLiteCore","SQLiteSupport"});// Uncomment if you are using Slate UI//PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore", "InputDevice"});// Uncomment if you are using online features// PrivateDependencyModuleNames.Add("OnlineSubsystem");// To include OnlineSubsystemSteam, add it to the plugins section in your uproject file with the Enabled attribute set to true}
}示例代码：
【ASQLiteManager.h】
// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "SQLiteDatabaseConnection.h"
#include "SQLiteManager.generated.h"UCLASS()
class PAKFRAMEWORK_API ASQLiteManager : public AActor
{GENERATED_BODY()public:// Sets default values for this actor's propertiesASQLiteManager();protected:// Called when the game starts or when spawnedvirtual void BeginPlay() override;public:// Called every framevirtual void Tick(float DeltaTime) override;virtual void EndPlay(const EEndPlayReason::Type EndPlayReason) override;private:FSQLiteDatabaseConnection DBConnection;bool bIsOpened = false;
public:bool OpenDB(const FString& FileFullPath,const FString& UserName = TEXT(""),const FString& Password = TEXT(""));bool CloseDB();bool ExecSql(const TCHAR* InStatement);bool ExecSql(const TCHAR* InStatement, FDataBaseRecordSet*& RecordSet);
}【ASQLiteManager.cpp】
// Fill out your copyright notice in the Description page of Project Settings.#include "SQLiteManager.h"#include "MyFramework/AOT/Runtime/CoreKits/LogKit.h"// Sets default values
ASQLiteManager::ASQLiteManager()
{// Set this actor to call Tick() every frame. You can turn this off to improve performance if you don't need it.PrimaryActorTick.bCanEverTick = true;
}// Called when the game starts or when spawned
void ASQLiteManager::BeginPlay()
{Super::BeginPlay();const FString DBFileFullPath = TEXT("D:/_DB/DB_G005.db");if(OpenDB(DBFileFullPath)){/*//【1.创建数据表】if(ExecSql(TEXT("create table table_name(id integer,name text,age integer);") )){ULogKit::I(__FUNCTION__,TEXT("成功生成表格!!!"));}else{ULogKit::E(__FUNCTION__,TEXT("生成表格失败!!!"));}*//*//【2.检查数据表是否存在】FDataBaseRecordSet* ResultSet;if(ExecSql(TEXT("select * from sqlite_master where type = 'table' and name = 'table_name';"),ResultSet)){const int32 RecordCount = ResultSet->GetRecordCount();if(RecordCount > 0){ULogKit::I(__FUNCTION__,TEXT("数据表 存在!!!"));}else{ULogKit::E(__FUNCTION__,TEXT("数据表 不存在 1 !!!"));}//【注意】//此处必须删除FDataBaseRecordSet对象，其为new方式生成对象-->[FSQLiteDatabaseConnection.cpp]-->RecordSet = new FSQLiteResultSet(MoveTemp(PreparedStatement));//否则CloseDB()会失败，退出程序时抛出异常："Destructor called while an SQLite database was still open. Did you forget to call Close?"delete ResultSet;ResultSet = nullptr;}else{ULogKit::E(__FUNCTION__,TEXT("数据表 不存在 2 !!!"));}*//*//【3.插入表字段】if(ExecSql(TEXT("alter table table_name add column age2 integer;"))){ULogKit::I(__FUNCTION__,TEXT("插入表字段 成功!!!"));}else{ULogKit::E(__FUNCTION__,TEXT("插入表字段 失败!!!"));}*//*//【4.删除表】if(ExecSql(TEXT("drop table table_name;"))){ULogKit::I(__FUNCTION__,TEXT("删除表 成功!!!"));}else{ULogKit::E(__FUNCTION__,TEXT("删除表 失败!!!"));}*//*//【5.1.数据-增加行】if(ExecSql(TEXT("insert into table_name values(1,\"张三\",18,19);")))//不指定列字段{ULogKit::I(__FUNCTION__,TEXT("增加行 成功!!!"));}else{ULogKit::E(__FUNCTION__,TEXT("增加行 失败!!!"));}//【5.2.数据-增加行】if(ExecSql(TEXT("insert into table_name(name ,age) values(\"李四\",18);")))//指定列字段{ULogKit::I(__FUNCTION__,TEXT("增加行 成功!!!"));}else{ULogKit::E(__FUNCTION__,TEXT("增加行 失败!!!"));}*//*//【6.数据-删除行】if(ExecSql(TEXT("delete from table_name where id=1;"))){ULogKit::I(__FUNCTION__,TEXT("删除行 成功!!!"));//若删除不存在项，也会返回true}else{ULogKit::E(__FUNCTION__,TEXT("删除行 失败!!!"));}*//*//【7.数据-更新行】if(ExecSql(TEXT("update table_name set name=\"王五\",age=38 where id=1;"))){ULogKit::I(__FUNCTION__,TEXT("更新行 成功!!!"));//删除不存在项，也会返回true}else{ULogKit::E(__FUNCTION__,TEXT("更新行 失败!!!"));}*///【8.数据-查询】FDataBaseRecordSet* ResultSet;if(DBConnection.Execute(TEXT("select * from tablename"),ResultSet)){FDataBaseRecordSet::TIterator itor(ResultSet);//通过get获得数据while (itor) {int32 Id = itor->GetInt(TEXT("id"));FString Name = itor->GetString(TEXT("name"));int32 Age = itor->GetInt(TEXT("age"));ULogKit::I(__FUNCTION__,TEXT("id = ")+FString::FromInt(Id)+TEXT(" ; name = ")+Name+TEXT(" ; age = ")+FString::FromInt(Age));++itor;}//【注意】//此处必须删除FDataBaseRecordSet对象，其为new方式生成对象-->[FSQLiteDatabaseConnection.cpp]-->RecordSet = new FSQLiteResultSet(MoveTemp(PreparedStatement));//否则CloseDB()会失败，退出程序时抛出异常："Destructor called while an SQLite database was still open. Did you forget to call Close?"delete ResultSet;ResultSet = nullptr;}}else{ULogKit::E(__FUNCTION__,TEXT("无法打开DB!!!"));}
}// Called every frame
void ASQLiteManager::Tick(float DeltaTime)
{Super::Tick(DeltaTime);
}void ASQLiteManager::EndPlay(const EEndPlayReason::Type EndPlayReason)
{Super::EndPlay(EndPlayReason);CloseDB();
}bool ASQLiteManager::OpenDB(const FString& FileFullPath,const FString& UserName,const FString& Password)
{if(IsDatabaseExists(FileFullPath)){if(DBConnection.Open(*FileFullPath,nullptr,nullptr)){bIsOpened = true;}else{bIsOpened = false;}}else{bIsOpened = false;}return bIsOpened;
}bool ASQLiteManager::CloseDB()
{if(bIsOpened){DBConnection.Close();return true;}else{return false;}
}bool ASQLiteManager::ExecSql(const TCHAR* InStatement)
{if(bIsOpened){return DBConnection.Execute(InStatement);}else{return false;}
}bool ASQLiteManager::ExecSql(const TCHAR* InStatement, FDataBaseRecordSet*& RecordSet)
{if(bIsOpened){return DBConnection.Execute(InStatement,RecordSet);}else{return false;}
}
