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[Test]
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public void TestSelectSql()
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{
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try
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{
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//创建临时表
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DBFactorySingleton.GetInstance().ExecuteSql("create table testSql (id int,name varchar(20)) ");
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}
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catch(Exception)
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{
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//删除临时数据
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DBFactorySingleton.GetInstance().ExecuteSql("drop table testSql ");
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//创建临时表
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DBFactorySingleton.GetInstance().ExecuteSql("create table testSql (id int,name varchar(20)) ");
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}
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//插入数据
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DBFactorySingleton.GetInstance().ExecuteSql("insert into testSql values(1,'10')");
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DBFactorySingleton.GetInstance().ExecuteSql("insert into testSql values(2,'20')");
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string selectSql="select * from testSql";
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//查询数据
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IDataReader read= DBFactorySingleton.GetInstance().SelectSql(selectSql);
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Assert.IsNotNull(read);
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read.Read();
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Assert.AreEqual( read[0].ToString(),"1");
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Assert.AreEqual( read[1].ToString(),"10");
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read.Read();
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Assert.AreEqual( read[0].ToString(),"2");
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Assert.AreEqual( read[1].ToString(),"20");
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Assert.IsFalse( read.Read()); //只有两条记录
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read.Close();
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//添加一列
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DBFactorySingleton.GetInstance().ExecuteSql("alter table testSql add testcolumn int");
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//查询数据
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read= DBFactorySingleton.GetInstance().SelectSql(selectSql);
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Assert.IsNotNull(read);
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read.Read();
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Assert.AreEqual(3,read.FieldCount) ;
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read.Close();
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//删除临时数据
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DBFactorySingleton.GetInstance().ExecuteSql("drop table testSql ");
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}
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问题出现在第47行,即先执行某查询,然后添加字段,再次查询出来的结果中 字段数量不变!
这个unit在Sqlserver中测试是没有问题的,为什么在Oracle中就不行了呢?
开始的时候,以为Oracel的Connection缓存的原因,于是在ODP.net的连接字符串中加入Pooling=false,不使用连接池,但测试还是不通过。
即然与连接池无关,那就可能是查询本身的问题,突然想到原来在做Oracle优化时候的一个原则:尽量执行同样的SQL语句。 是否与这有关呢?
在第40行加入:
selectSql="select * from testSql "; //后面加一空格
再次运行,测试通过!
总结:在Oracle中,同样的Sql语句在查询的时候性能会更高,但如果修改了表结构,查询结果中的表格保持不变。