MySQL binlog反解析

反解析delete语句

背景：delete table忘了加条件导致整张表被删除
恢复方式：直接从binlog里反解析delete语句为insert进行恢复

导出删指定表的DELETE语句：

# mysqlbinlog  -vv -d dbname mysql-bin.000048 | awk '/DELETE FROM/ && (/dbname.tbname/ || /`dbname.`tbname`/){
    while(1){
        print $0;
        getline;
        if($0 !~ /^###/){
            break;
        };
    }
}' > dbname.tbname.delete.txt

去掉binlog每行开头的#

# sed -i 's/^### //g' dbname.tbname.delete.txt

语句转换 DELETE --> INSERT

# sed -i "s/^DELETE FROM/INSERT INTO/g" dbname.tbname.delete.txt
# sed -i "s/^WHERE/VALUES(/g" dbname.tbname.delete.txt
# sed -i '/@13=.*/a );' dbname.tbname.delete.txt

字段处理

# cat dbname.tbname.delete.txt | awk -F"=|/*" '{
    if($0 ~ /^INSERT|^VALUES|^);/){
        print $0;
    }else{
        printf $2",";
    };
}' > dbname.tbname.insert.sql

去掉values()最后一个逗号

# sed -i "s/,);$/);/g" dbname.tbname.insert.sql

至此就将delete语句反解析为insert语句了

重新导入数据库