/// <summary>
/// 构造缓存键值。
/// </summary>
/// <param name="builder">select命令构造器。</param>
/// <param name="tag">标记。</param>
/// <param name="type">类型。</param>
/// <returns>返回缓存键值。</returns>
protected virtual string BuildCacheKey(Symbol.Data.ISelectCommandBuilder builder, string tag, Type type)
{
return(string.Concat(
tag, ":",
type.AssemblyQualifiedName, "|",
builder.CommandText, "/",
Symbol.Serialization.Json.ToString(builder.Parameters, true)
));
}
/// <summary>
/// 缓存键值操作。
/// </summary>
/// <param name="cache">缓存对象。</param>
/// <param name="builder">select命令构造器。</param>
/// <param name="tag">标记。</param>
/// <param name="type">类型。</param>
/// <param name="func">缓存求值委托。</param>
/// <returns>返回</returns>
protected virtual object CacheFunc(IDataBinderObjectCache cache, Symbol.Data.ISelectCommandBuilder builder, string tag, Type type, CacheValueFunc func)
{
if (cache != null && AllowCache)
{
object value;
string key = BuildCacheKey(builder, tag, type);
if (!cache.Get(key, out value))
{
value = func();
cache.Set(key, value);
}
return(value);
}
else
{
return(func());
}
}
/// <summary>
/// select命令构造器预处理（处理$this.xx值引用）。
/// </summary>
/// <param name="dataContext">数据上下文对象。</param>
/// <param name="dataReader">数据读取对象。</param>
/// <param name="entity">当前实体对象。</param>
/// <param name="builder">select命令构造器。</param>
/// <param name="cache">缓存。</param>
protected virtual void PreSelectBuilder(IDataContext dataContext, System.Data.IDataReader dataReader, object entity, Symbol.Data.ISelectCommandBuilder builder, IDataBinderObjectCache cache)
{
var baseAddCommandParameter = builder.AddCommandParameter;
builder.AddCommandParameter = (p) => {
string p10 = p as string;
if (p10 != null && p10[0] == '$' && p10.Length > 1)
{
var value = CacheFunc(cache, entity, p10, () => {
var func = GetPreSelectBuilderFunc(entity.GetType(), p10);
return(func?.Invoke(dataContext, dataReader, entity));
});
//var value = GetPreSelectBuilderFunc(entity.GetType(), p10)?.Invoke(dataContext, dataReader, entity);
return(baseAddCommandParameter(value));
}
return(baseAddCommandParameter(p));
};
}
