/// <summary>
/// 尝试创建对应的表。
/// </summary>
/// <param name="entityType">实体类型。</param>
/// <param name="context"></param>
/// <returns></returns>
public static bool TryCreate(Type entityType, InternalContext context)
{
var metadata = EntityMetadataUnity.GetEntityMetadata(entityType);
var lazy = new Lazy <bool>(() =>
{
var syntax = context.Database.Provider.GetService <ISyntaxProvider>();
//判断表是否存在
SqlCommand sql = syntax.ExistsTable(metadata.TableName);
if (context.Database.ExecuteScalar <int>(sql) == 0)
{
if (InternalCreate(metadata, syntax, context))
{
//通知 context 仓储已经创建
if (context.OnRespositoryCreated != null)
{
context.OnRespositoryCreated(entityType);
}
return(true);
}
return(false);
}
return(true);
});
return(cache.TryGetValue(entityType, () => lazy.Value));
}