They define two types of drivers: optimistic and defensive.

他们把司机分为两类：乐观型和防御型。

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Let's start by comparing two types of drivers that are available.

首先让我们来比较现有的两种驱动程序。

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Because of the native code, their portability is limited. DB2 UDB provides two types of drivers in this category.

由于有本机代码，它们的可移植性受到了限制。

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The two types of JDBC drivers handle errors in very different ways.

这两类JDBC驱动程序处理错误的方式大相径庭。

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Both the ibm_db2 and PDO_IBM drivers support two types of cursors: forward-only cursors and scrollable cursors.

ibm_db2和PDO_IBM驱动程序都支持两种类型的游标：只能前进(forward -only)的游标和可滚动游标。

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Both the ibm_db2 and PDO_IBM drivers support two types of cursors: forward-only cursors and scrollable cursors.

ibm_db2和PDO_IBM驱动程序都支持两种类型的游标：只能前进(forward -only)的游标和可滚动游标。

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