C# 如何使用OleDbDataAdapter和sql查询更新数据库?
我有以下代码:C# 如何使用OleDbDataAdapter和sql查询更新数据库?,c#,ado.net,C#,Ado.net,我有以下代码: OleDbDataAdapter dataAdapter = new OleDbDataAdapter("SELECT col1, col2 " + "FROM tab1", connection); 我想这样做: dataAdapter.UpdateCommand = ne
OleDbDataAdapter dataAdapter = new OleDbDataAdapter("SELECT col1, col2 "
+ "FROM tab1",
connection);
我想这样做:
dataAdapter.UpdateCommand = new OleDbCommand(
"UPDATE tab1 SET col1 = col1*2, col2 = 300"
+ "WHERE col1 = 5", connection);
var cmd = new OleDbCommand("UPDATE tab1 SET col1 = col1*2, col2 = 300 WHERE col1 = 5", connection);
cmd.ExecuteNonQuery();
如何做到这一点?只需像这样使用它:
dataAdapter.UpdateCommand = new OleDbCommand(
"UPDATE tab1 SET col1 = col1*2, col2 = 300"
+ "WHERE col1 = 5", connection);
var cmd = new OleDbCommand("UPDATE tab1 SET col1 = col1*2, col2 = 300 WHERE col1 = 5", connection);
cmd.ExecuteNonQuery();
您不需要数据适配器。您面临的问题是什么?我有一个选项:
ExecuteNonQuery:Connection属性尚未初始化。
oncmd.ExecuteNonQuery()
@William,您传入的连接是否为空?