Question

我有一些我想获得本地化名称的药物，但是我无法获得他们的本地化名称（在回报中它们是空白的）。

这是查询（在运行时）。

SELECT m.Id as Id, m.Name as Name, lm.Name as ProductName 
FROM Medicine m 
INNER JOIN LocalizedMedicine lm 
    ON lm.MeId = m.Id 
    AND lm.LanguageCode = 'en-US' 
ORDER BY m.Name

这是我的课程。

public class LocalizedMedicine
{        
    [PrimaryKey, AutoIncrement]
    public int Id { get; set; }
    [Indexed("LocMedName", 0)]
    public string Name { get; set; }
    public string LanguageCode { get; set; }
    public int MeId { get; set; }
}



public class Medicine : ObservableObject
{
    [PrimaryKey, AutoIncrement]
    public int Id { get; set; }
    /// <summary>
    /// The universal Latin medical name.
    /// </summary>
    public string Name { get; set; }

    /// <summary>
    /// The primary Gene that this medicine uses.
    /// </summary>
    public int GeneId { get; set; }

    [Ignore]
    public Gene GeneUsed { get; set; }

    private string productName;
    /// <summary>
    /// The localized product name. It retrieves the
    /// localized name from AppResources if it is null.
    /// </summary>
    [Ignore]
    public string ProductName
    {
        get
        {
            // old attempt
            //if (productName == null)
            //    productName = AppResources.ResourceManager.GetString(Name);

            return productName;
        }
        set
        {
            productName = value;
            NotifyPropertyChanged("ProductName");
        }
    }

    /// <summary>
    /// Does a reference comparison and Name comparison, since the names (latin names)
    /// should be unique.
    /// </summary>
    /// <param name="m"></param>
    /// <returns></returns>
    public override bool Equals(object m)
    {
        if (m == null) return false;
        if (m == this) return true;
        if (((Medicine)m).Name == this.Name) return true;
        return false;
    }
}

以下是我打电话的方式（在PCL中）

public IEnumerable<Medicine> GetAllMedicines(CultureInfo cultureInfo)
    {
        string langCode = cultureInfo.Name;

        // get all of the medicines and join LocalizedMedicine on MeId = med.Id
        // and LanguageCode = langCode


        var query = database.QueryAsync<Medicine>(
            "SELECT m.Id as Id, m.Name as Name, lm.Name as ProductName " +
            "FROM Medicine m " +
            "INNER JOIN LocalizedMedicine lm ON lm.MeId = m.Id AND lm.LanguageCode = " + "'" + langCode + "' " +
            "ORDER BY m.Name"
            );
        query.Wait();

        var result = query.Result;
        return result;
    }

Answer 1

从＆＃34; ON＆＃34;更改查询条件到＆＃34;在哪里＆＃34;并从Medicine类中删除了ignore属性。 woops。

在sqlite中使用Inner Join不返回连接表的数据

1 个答案: