BUG: “java.sql.Connection.prepareStatement(String)“ because “this.conn“ is null - 代码天地

BUG: “java.sql.Connection.prepareStatement(String)“ because “this.conn“ is null

编程语言 2023-04-08 21:55:51 阅读次数: 0

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转载自blog.csdn.net/weixin_45384457/article/details/128260925

BUG: “java.sql.Connection.prepareStatement(String)“ because “this.conn“ is null

Cannot invoke “java.sql.Connection.prepareStatement(String)“because “this.conn“ is null

测试报错：java.lang.NullPointerException: Cannot invoke “......“ because “......“ is null

java.sql.SQLException: null, message from server: "Host 'xx' is blocked because of many co

java.sql.SQLException: null, message from server: “Host ‘xx‘ is blocked because of many co

null, message from server: "Host 'xxx' is blocked because of many connection errors; unblock

null, message from server: "Host 'PC-20130201IBXI' is blocked because of many connection errors; un

conn.closed()和conn == null的区别

Cannot invoke “java.util.ArrayList.add(Object)“ because “this.books“ is null

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java.sql.SQLException: connection holder is null;

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SQL(is Null)

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SQL bug

SQL state [null]; error code [0]; connection holder is null

Host 'XXXXXX' is blocked because of many connection errors

【转】Host is blocked because of many connection errors

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