UE5连接SQL数据库

1、安装 Sql Connect 插件
Install the Sql Connect plugin

https://www.unrealengine.com/marketplace/zh-CN/product/d1e931c9fb2a459ea2f33a12823e830a

2、使用插件
Use plugins

Features:（产品特点）

Support local SQL server and cloud database connection (eg: Azure Database for SQL)
支持本地SQL服务器和云数据库连接（例如：Azure Database for SQL）

Support C++ or pure blueprint calls
支持 C++ 或纯蓝图调用

Synchronous and asynchronous support
同步和异步支持

used in C++（在 C++ 中使用）

/// synchronous connection example（同步连接示例） ///

sql = USqlConnectSubsystem::Get();
Results = NewObject();

sql->Connect("127.0.0.1", 1433, "username", "pw", "TableName", Results);
if (!Results->IsSucceed)
{
	UE_LOG(LogTemp, Warning, TEXT("SQL: ConnectError: %s"), *Results->Msg);
	return;
}

//Get the total number of rows
sql->Query("SELECT count(1) FROM `testtable`", Results);
UE_LOG(LogTemp, Warning, TEXT("SQL: Count: IsSucceed = %d, msg = %s, count = %d"), Results->IsSucceed, *Results->Msg, Results->getCount());

//get row
sql->Query("SELECT * FROM `testtable`", Results);
UE_LOG(LogTemp, Warning, TEXT("SQL: rows: IsSucceed = %d, msg = %s, Num = %d"), Results->IsSucceed, *Results->Msg, Results->getRows().Num());

/// Asynchronous connection example（异步连接示例） ///

sql = USqlConnectSubsystem::Get();
Results = NewObject();

const FLatentActionInfo LatentInfo(0, FMath::Rand(), TEXT("ConnectCallback"), this);
sql->AConnect("127.0.0.1", 1433, "username", "pw", "TableName", Results, this, LatentInfo);

//Asynchronous callback function
void APluginProjectGameModeBase::ConnectCallback()
{
    if (!Results->IsSucceed)
    {
        UE_LOG(LogTemp, Warning, TEXT("SQL: ConnectError: %s"), *Results->Msg);
        return;
    }

    //Get the total number of rows
    const FLatentActionInfo LatentInfo(0, FMath::Rand(), TEXT("fetch_count_Callback"), this);
    sql->AQuery("SELECT count(1) FROM `testtable`", Results, this, LatentInfo);
}

//Asynchronous callback function
void APluginProjectGameModeBase::fetch_count_Callback()
{
    UE_LOG(LogTemp, Warning, TEXT("SQL: Count: IsSucceed = %d, msg = %s, count = %d"), Results->IsSucceed, *Results->Msg, Results->getCount());

    //get row
    const FLatentActionInfo LatentInfo(0, FMath::Rand(), TEXT("fetch_rows_Callback"), this);
    sql->AQuery("SELECT * FROM `testtable`", Results, this, LatentInfo);
}

//Asynchronous callback function
void APluginProjectGameModeBase::fetch_rows_Callback()
{
    UE_LOG(LogTemp, Warning, TEXT("SQL: rows: IsSucceed = %d, msg = %s, Num = %d"), Results->IsSucceed, *Results->Msg, Results->getRows().Num());
}