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我正在尝试使用新的 Mono 2.6 SqlMetal 工具为简单的 Sqlite 数据库创建 DBML 文件。架构非常简单,如下所示:

CREATE TABLE Tags (
    Id              INTEGER PRIMARY KEY,
    TagName         TEXT,
    Description     TEXT);
CREATE TABLE Trends (
    TagId           INTEGER NOT NULL,
    Timestamp       DATETIME NOT NULL,
    Value           TEXT,
    PRIMARY KEY (tagid, timestamp));

我正在尝试使用以下内容创建 DBML 文件:

sqlmetal.exe /conn:"Data Source=MyDatabase.db" /namespace:MyNamespace /provider:Sqlite /dbml:MyDatabase.dbml

我得到以下输出:

>>> Reading schema from SQLite database
<<< Writing file 'MyDatabase.dbml'
sqlmetal failed:System.InvalidOperationException: There was an error reflecting type 'DbLinq.Schema.Dbml.Database'. --->
 System.InvalidOperationException: DbLinq.Schema.Dbml.Database is inaccessible due to its protection level. Only public types can be processed
  at System.Xml.Serialization.ReflectionHelper.CheckSerializableType (System.Type type, Boolean allowPrivateConstructors ) [0x00000] in <filename unknown>:0
  at System.Xml.Serialization.XmlReflectionImporter.ImportClassMapping (System.Xml.Serialization.TypeData typeData, System.Xml.Serialization.XmlRootAttribute root, System.String defaultNamespace) [0x00000] in <filename unknown>:0
  at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping (System.Xml.Serialization.TypeData typeData, System.Xml.Serialization.XmlRootAttribute root, System.String defaultNamespace) [0x00000] in <filename unknown>:0
  --- End of inner exception stack trace ---
  at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping (System.Xml.Serialization.TypeData typeData, System.Xml.Serialization.XmlRootAttribute root, System.String defaultNamespace) [0x00000] in <filename unknown>:0
  at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping (System.Type type, System.Xml.Serialization.XmlRootAttribute root, System.String defaultNamespace) [0x00000] in <filename unknown>:0
  at System.Xml.Serialization.XmlSerializer..ctor (System.Type type, System.Xml.Serialization.XmlAttributeOverrides overrides, System.Type[] extraTypes, System.Xml.Serialization.XmlRootAttribute root, System.String defaultNamespace) [0x00000] in <filename unknown>:0  at System.Xml.Serialization.XmlSerializer..ctor (System.Type type) [0x00000] in <filename unknown>:0
  at DbLinq.Schema.Dbml.DbmlSerializer.Write (System.IO.Stream xmlStream, DbLinq.Schema.Dbml.Database dbml) [0x00000] in <filename unknown>:0
  at DbMetal.Generator.Implementation.Processor.WriteSchema (DbLinq.Schema.Dbml.Database dbSchema, ISchemaLoader schemaLoader, DbMetal.Parameters parameters) [0x00000] in <filename unknown>:0
  at DbMetal.Generator.Implementation.Processor.ProcessSchema (DbMetal.Parameters parameters) [0x00000] in <filename unknown>:0

我可以使用 /code 选项来创建 C# 代码文件,但是在生成 DBML 时它总是失败。

我错过了一个微妙的命令行选项,还是这个新版本的 SqlMetal 不适用于 Sqlite?

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<sheepish-grin>你相信我以前没有尝试过生成 DBML 文件吗?</sheepish-grin>

简短版本:这是您遇到的错误,没有解决方法。我已将其归档为http://code.google.com/p/dblinq2007/issues/detail?id=171

更长的版本:似乎没有一个简单的解决方案(除了“jettison System.Xml.Serialization”),因为引用的DbLinq.Schema.Dbml.Database类型不能从 公开System.Data.Linq.dll,原因很明显。由于不同的错误,在 Linux 下构建 DbLinq 并使用 DbMetal.exe 的“解决方法”不起作用。

带来不便敬请谅解。

于 2009-12-16T20:11:09.327 回答