.net core 使用 freesql 备份结构和数据

1、获取表结构

//获取表结构,无分库
List dbTableInfos =
    _freeSql.DbFirst.GetTablesByDatabase(_freeSql.DbFirst.GetDatabases()[0]);

2、序列化表结构，序列化时Table字段会循环引用，需要排除掉

//备份表结构
dbTableInfos
    .AsParallel()
    .WithDegreeOfParallelism(_backupConfig.backupThread)
    .ForAll(_ =>
{
    //目录名称就是表名
    string tempPath = Path.Combine(filePathName, _.Name);
    //文件
    string tempFilePath = Path.Combine(tempPath, _.Name);

    _iLogger.Info($"备份表:{_.Name},备份文件路径:{tempPath}");

    if (!Directory.Exists(tempPath))
    {
        Directory.CreateDirectory(tempPath);
    }

    //表结构
    string tableStructure = JsonHelperEx.SerializeSettingsEx(_, new Newtonsoft.Json.JsonSerializerSettings()
    {
        ContractResolver = new IgnorePropertiesContractResolver(new[] { "Table" })
    });

    //写入文件
    File.WriteAllText(tempFilePath, tableStructure);
    _iLogger.Info($"备份表结构:{_.Name},完成");
});

注：排除的代码

/// 

/// 序列化时过滤某个字段
/// 
public class IgnorePropertiesContractResolver : DefaultContractResolver
{
    private readonly HashSet _ignoreProps;

    /// 

    /// 构造
    /// 
    /// 
    public IgnorePropertiesContractResolver(IEnumerable propNamesToIgnore)
    {
        _ignoreProps = new HashSet(propNamesToIgnore);
    }

    /// 

    /// 创建映射
    /// 
    /// 
    /// 
    /// 
    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
    {
        JsonProperty property = base.CreateProperty(member, memberSerialization);
        if (_ignoreProps.Contains(property.PropertyName))
        {
            property.ShouldSerialize = _ => false;
        }
        return property;
    }
}

3、备份数据

//数据
List