此 getObject 方法是由 java.sql.CallableStatement 接口中的 getObject 方法指定的。 此方法将返回给定列的值作为一个 Java 对象。 根据 JDBC 规范中指定的内置类型映射，Java 对象的类型将为对应于此列 SQL 类型的默认 Java 对象类型。 如果值为 SQL NULL，驱动程序将返回 Java null。

此 getConnection 方法是由 javax.sql.DataSource 接口中的 getConnection 方法指定的。

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Contains information about the check itself. The metadata object is mandatory for all BChecks and must be placed at the very start of the definition.

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