如何使用拥有类型的自定义名称约定

Question

public class ProcessInitialization
{
    public Guid CorrelationId { get; set; }
    public MyProcessContext ProcessContext { get; set; }
}
public class MyProcessContext
{
    public int? ProcessId { get; set; }
}

不使用我的约定，我得到了

SELECT `process`.`CorrelationId`
FROM `ProcessInitialization` AS `process`
WHERE `process`.`ProcessContext_ProcessId` = 8

我的约定从 PascalCase：

制造 snake_case

public static void SetSimpleUnderscoreTableNameConvention(this ModelBuilder modelBuilder,
    bool preserveAcronyms,
    IDictionary<string, string> propertyMap = null,
    IDictionary<string, string> entityMap = null
    )
{
    var propMap = propertyMap ?? new Dictionary<string, string>();
    var entMap = entityMap ?? new Dictionary<string, string>();
    foreach (var entity in modelBuilder.Model.GetEntityTypes())
    {
        foreach (var prop in entity.GetProperties())
        {
            if (propMap.ContainsKey(prop.Name))
            {
                prop.Relational().ColumnName = propMap[prop.Name];
            }
            else
            {
                var underscoredProp = AddUndercoresToSentence(prop.Name, preserveAcronyms);
                prop.Relational().ColumnName = underscoredProp.ToLowerInvariant();
            }
        }
        var entName = entity.DisplayName();
        if (entMap.ContainsKey(entName))
        {
            entity.Relational().TableName = entMap[entName];
        }
        else
        {
            var underscored = AddUndercoresToSentence(entity.DisplayName(), preserveAcronyms);
            entity.Relational().TableName = underscored.ToLowerInvariant();
        }
    }
}

用它查询变得无效：

SELECT `process`.`correlation_id`
FROM `process`
LEFT JOIN `process_initialization._process_context#_my_process_context` AS `process.ProcessContext` ON `process`.`correlation_id` = `process.ProcessContext`.`process_initialization_correlation_id`
WHERE `process.ProcessContext`.`process_id` = 8

看来我不需要将转换应用于entity的某些：

var underscored = AddUndercoresToSentence(entity.DisplayName(), preserveAcronyms);
if (underscored.Contains("#")) // any other way to understand it is special?
    continue;
entity.Relational().TableName = underscored.ToLowerInvariant();

之后我得到了：

'processInitialization.processContext＃myProcessContext'}键{'processInitialization -correlationId'} on'processInitialization'的procesitialization.processContext＃myProcessContext'和{'corralationId'}都映射到'process_Initialization.pk_process_initialization.pk_initialization_initialization'，但与不同的列'correlation_id'}）。

Answer 1

拥有的类型需要特殊处理。

首先，您使用IEntityType.IsOwned()方法识别它们。

然后，当拥有实体类型时，您应该跳过表名映射（因为它们与根所有者实体共享同一表）。还具有Shadow PK属性，应该跳过Shadow PK属性，对于其他属性，您应该从根所有者到拥有类型的路径构建列名。所有者信息可通过DefiningEntityType和DefiningNavigationName的 IEntityType属性访问。

将所有这些应用于您的代码：

foreach (var entity in modelBuilder.Model.GetEntityTypes())
{
    foreach (var prop in entity.GetProperties())
    {
        if (entity.IsOwned() && prop.IsPrimaryKey()) continue;
        IEntityType propOwner = entity;
        string propName = prop.Name, columnName = null;
        do
        {
            if (!propMap.TryGetValue(propName, out var name))
                name = AddUndercoresToSentence(propName, preserveAcronyms).ToLowerInvariant();
            columnName = columnName == null ? name : name + "_" + columnName;
            propName = propOwner.DefiningNavigationName;
            propOwner = propOwner.DefiningEntityType;
        }
        while (propName != null);
        prop.Relational().ColumnName = columnName;
    }
    if (entity.IsOwned()) continue;
    var entName = entity.DisplayName();
    if (!entMap.TryGetValue(entName, out var tableName))
        tableName = AddUndercoresToSentence(entName, preserveAcronyms).ToLowerInvariant();
    entity.Relational().TableName = tableName;
}