ExecuteScalar,ExecuteReader,ExecuteNonQuery区别
ExecuteScalar
is typically used when your query returns a single value. If it returns more, then the result is the first column of the first row. An example might be SELECT @@IDENTITY AS 'Identity'
.
ExecuteReader
is used for any result set with multiple rows/columns (e.g., SELECT col1, col2 from sometable
).
ExecuteNonQuery
is typically used for SQL statements without results (e.g., UPDATE, INSERT, etc.).
原文地址:https://www.cnblogs.com/shy1766IT/p/7528126.html