Question

我有一个SQL查询，我想使用EntityFramework和Linq调用此查询。我怎样才能做到这一点？

我想获取包含特定列名的表名：

SELECT    DISTINCT t.name AS 'TableName'
FROM        sys.columns c
JOIN        sys.tables  t   ON c.object_id = t.object_id
WHERE       c.name LIKE '%CustomField%'
ORDER BY    TableName

Answer 1

我不确定你为什么会在实体中搜索那样的表。

Msdn充满了exemple 它的总和是：参数化查询返回ObjectQuery<string>。

using (myEntities myContext = new myEntities())
{   
    // Create a query string
    string myQuery = @"SELECT    DISTINCT t.name AS 'TableName' "+
                        "FROM        sys.columns c "+
                        "JOIN        sys.tables  t   ON c.object_id = t.object_id "+
                        "WHERE       c.name LIKE '%@CustomField%' "+
                        "ORDER BY    TableName"; 

    // Create a query
    //If you return a primitive type you can use ObjectQuery<string>
    ObjectQuery<DbDataRecord> tableQuery = new ObjectQuery<DbDataRecord>(myQuery, myContext);

    // Add parameters.
    tableQuery.Parameters.Add(new ObjectParameter("CustomField", "FOOBAR"));

    // Go through the Result 
    foreach (DbDataRecord rec in tableQuery)
    {
        Console.WriteLine("TableName\t [{0}]", rec[0]);
    }
}

Answer 2

    string Query = "SELECT    DISTINCT t.name AS 'TableName' "+
                            "FROM        sys.columns c "+
                            "JOIN        sys.tables  t   ON c.object_id = t.object_id "+
                            "WHERE       c.name LIKE '%@table%' "+
                            "ORDER BY    TableName"

    vr db = new DB();     
    string table = "YourTableName";     
    var result = db.Database.SqlQuery<string>(Query, new SqlParameter("@table", table)).ToList();

我如何使用EntityFramework获取表名

2 个答案: