就像標(biāo)題所說的那樣，我想知道為什么準(zhǔn)備好的語句.isClosed()方法在關(guān)閉基礎(chǔ)流(使用JDBC)后將返回false。

public void someTest() throws SQLException, InterruptedException {

Connection conn = DBHelper.newConnection();

PreparedStatement statement = conn.prepareCall(CLEANUP_DELETE);

conn.close();

System.out.println(statement.isClosed());

Thread.sleep(1000);

System.out.println(statement.isClosed());

}

產(chǎn)量

false

false

但是，如果您嘗試調(diào)用set方法或execute，則會得到以下信息：

java.sql.SQLException: org.apache.commons.dbcp.DelegatingCallableStatement with address: "SQLServerCallableStatement:32" is closed.

at org.apache.commons.dbcp.DelegatingStatement.checkOpen(DelegatingStatement.java:137)

at org.apache.commons.dbcp.DelegatingPreparedStatement.setInt(DelegatingPreparedStatement.java:120)

at org.apache.commons.dbcp.DelegatingPreparedStatement.setInt(DelegatingPreparedStatement.java:120)

at com.ipti.ptl.common.messagetable.MessageHandlerTest.someTest(MessageHandlerTest.java:70)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606) .....

總結(jié)

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