如何获取表的PRIMARY KEY列名

Question

我需要获得PRIMARY KEY COLUMN NAME.我在一个名为变量的变量中有我的表的名称_lstview_item

直到现在我尝试获取这样的列名

 string sql = "SELECT ColumnName = col.column_name" +
              "FROM information_schema.table_constraints tc" +
              "INNER JOIN information_schema.key_column_usage col" +
              "ON col.Constraint_Name = tc.Constraint_Name" +
                      "AND col.Constraint_schema = tc.Constraint_schema" +
              "WHERE tc.Constraint_Type = 'Primary Key'" +
                      "AND col.Table_name = " +_lstview_item+ "";

 SqlConnection conn2 = new SqlConnection(cc.connectionString(cmb_dblist.Text));
 SqlCommand cmd_server2 = new SqlCommand(sql);
 cmd_server2.CommandType = CommandType.Text;
 cmd_server2.Connection = conn2;
 conn2.Open();
 string ColumnName = (string)cmd_server2.ExecuteScalar();                 
 conn2.Close();

没有任何成功.救命 ？

Answer 1

这应该是你的查询.您在表名上缺少单引号.经过测试,工作正常.

string sql = "SELECT ColumnName = col.column_name 
    FROM information_schema.table_constraints tc 
    INNER JOIN information_schema.key_column_usage col 
        ON col.Constraint_Name = tc.Constraint_Name 
    AND col.Constraint_schema = tc.Constraint_schema 
    WHERE tc.Constraint_Type = 'Primary Key' AND col.Table_name = '" + _lstview_item + "'";

Answer 2

试试这个:

SELECT column_name
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE OBJECTPROPERTY(OBJECT_ID(constraint_name), 'IsPrimaryKey') = 1
AND table_name = 'TableName'