读取Java字节码指令:数字意味着什么?(Reading a Java bytecode instruction: What does the number mean?)
我正在阅读java字节码,看到这个:
getfield #5 (Field java.lang.String name)
#5
是什么意思?我怎样才能写一个字节码的程序?
I was reading java bytecode and saw this:
getfield #5 (Field java.lang.String name)
What does
#5
mean?And how can I write a program in bytecode?
原文:https://stackoverflow.com/questions/9335729
更新时间:2023-07-16 08:07
最满意答案
正好之前帮人写了个,不过列出的信息比你这个多,你运行试试吧 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 select a.owner 所属用户,a.table_name 表名,a.column_name 字段名,a.data_type 字段类型,a.字段长度,a.字段精度,a.是否为空,a.创建日期,a.最后修改日期, case when a.owner=d.owner and a.table_name=d.table_name and a.column_name=d.column_name then '主键' else '' end 是否主键 from (select a.owner,a.table_name,b.column_name,b.data_type,case when b.data_precision is null then b.data_length else data_precision end 字段长度, data_scale 字段精度, decode(nullable,'Y','√','N','×') 是否为空,c.created 创建日期,c.last_ddl_time 最后修改日期
其他回答
常用数据库查询判断表和字段是否存在 数据库postgresql表是否存在字段是否存在oracle 1、mssql server 表:select count(*) from dbo.sysobjects where name= 'table_name'; 字段:select count(*) from syscolumns where id=object_id(‘table_name’) and name= 'column_name';2、my sql 表:select count(*) from information_schema.tables where table_name = 'table_name'; 字段:select count(*) from information_schema.columns where table_name = 'table_name' and column_name = 'column_name';3、oracle 表:select count(*) from user_objects where object_name = 'table_name'; 字段:select count(*) from user_tab_columns where table_name = 'table_name' and column_name = 'column_name';4、postgresql 表:select count(*) from information_schema.tables where table_schema='table_schema' and table_name ='table_name'; 字段:select count(*) from information_schema.columns where table_schema='table_schema'
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