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我用ExecuteScalar
单查询是这样的:我怎样才能使用执行读取器的不同变量?
try
{
OleDbConnection Connection;
using (Connection = new OleDbConnection("Provider=MSDAORA.1;Data Source=DATABASE:1521/orcl;Persist Security Info=True;Password=PASSWORD;User ID=USERNAME"))
{
OleDbCommand Command1, Command2, Command3;
Command1 = new OleDbCommand("SELECT HOUR FROM Table1 WHERE type='CAR' and name='FERRARI'",", Connection);
Command2 = new OleDbCommand("SELECT HOUR FROM Table1 WHERE type='CAR' and name='FORD'", Connection);
Command3 = new OleDbCommand("SELECT HOUR FROM Table1 WHERE type='CAR' and name='OPEL'", Connection);
Connection.Open();
var1 = (int)Command1.ExecuteScalar();
var2 = (int)Command2.ExecuteScalar();
var3 = (int)Command3.ExecuteScalar();
Connection.Close();
}
它的工作对我罚款。但是3(更多用于其他数据库)由于数据库而等待很多。我怎样才能选择所有的表(从表1中选择*),并在每个条件执行命令后?你可以在我的示例代码中向我展示这个例子吗?谢谢。