流畅的 NHibernte 变更/约定

发布于 2024-07-17 15:06:29 字数 875 浏览 9 评论 0原文

我喜欢我在这篇博文中看到的模式（http://marekblotny .blogspot.com/2009/04/conventions-after-rewrite.html），作者在应用约定之前检查是否已进行表名更改。

public bool Accept(IClassMap target)
{
    //apply this convention if table wasn't specified with WithTable(..) method
    return string.IsNullOrEmpty(target.TableName);
}

我用于字符串长度的约定接口是 IProperty：

public class DefaultStringLengthConvention: IPropertyConvention
{
    public bool Accept(IProperty property) {
        //apply if the string length hasn't been already been specified
        return ??; <------ ??
    }

    public void Apply(IProperty property) {
        property.WithLengthOf(50);
    }
}

我没有看到 IProperty 在哪里公开任何告诉我该属性是否已设置的信息。这可能吗？

TIA，贝里尔

原文

I like the pattern I saw in this blog post (http://marekblotny.blogspot.com/2009/04/conventions-after-rewrite.html), where the author is checking to see if a table name alteration has already been made before applying a convention.

public bool Accept(IClassMap target)
{
    //apply this convention if table wasn't specified with WithTable(..) method
    return string.IsNullOrEmpty(target.TableName);
}

The convention interface I'm using for a string length is IProperty:

public class DefaultStringLengthConvention: IPropertyConvention
{
    public bool Accept(IProperty property) {
        //apply if the string length hasn't been already been specified
        return ??; <------ ??
    }

    public void Apply(IProperty property) {
        property.WithLengthOf(50);
    }
}

I don't see where IProperty exposes anything that tells me if the property has already been set. Is this possible?

TIA,
Berryl

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帝王念 2024-07-24 15:06:29

.WithLengthOf() 将“更改”(Action) 添加到生成 XML 映射时要应用的更改列表中。不幸的是，该字段是 private 并且没有属性可以访问更改列表，因此恐怕（当前）无法检查属性映射是否具有 WithLengthOf应用于它。

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君勿笑 2024-07-24 15:06:29

在出现更好的替代方案之前，您可以使用 HasAttribute("length")。

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策马西风 2024-07-24 15:06:29

为了在代码中阐明 Stuart 和 Jamie 所说的内容，以下是有效的方法：

public class UserMap : IAutoMappingOverride<User>
{
    public void Override(AutoMap<User> mapping) {
        ...
        const int emailStringLength = 30;
        mapping.Map(x => x.Email)
            .WithLengthOf(emailStringLength)                        // actually set it
            .SetAttribute("length", emailStringLength.ToString());  // flag it is set
        ...

    }
}

public class DefaultStringLengthConvention: IPropertyConvention
{
    public bool Accept(IProperty property) {
        return true;
    }

    public void Apply(IProperty property) {
        // only for strings
        if (!property.PropertyType.Equals(typeof(string))) return;

        // only if not already set
        if (property.HasAttribute("length")) return;

        property.WithLengthOf(50);
    }
}

To clarify in code what Stuart and Jamie are saying, here's what works:

public class UserMap : IAutoMappingOverride<User>
{
    public void Override(AutoMap<User> mapping) {
        ...
        const int emailStringLength = 30;
        mapping.Map(x => x.Email)
            .WithLengthOf(emailStringLength)                        // actually set it
            .SetAttribute("length", emailStringLength.ToString());  // flag it is set
        ...

    }
}

public class DefaultStringLengthConvention: IPropertyConvention
{
    public bool Accept(IProperty property) {
        return true;
    }

    public void Apply(IProperty property) {
        // only for strings
        if (!property.PropertyType.Equals(typeof(string))) return;

        // only if not already set
        if (property.HasAttribute("length")) return;

        property.WithLengthOf(50);
    }
}

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~没有更多了~