format f

The role GDB accomplishes: Start the program, you can run the program as required by the engineer's custom Let the debugged program stop at the breakpoint specified by the engineer, and the breakpoint can be a conditional expression

Test environment: WindowsI. Exporting dataf:\dbsoft\soft\master\bin>mongoexport/h 127.0.0.1/port 50000/d testdb/c tb1--type=csv/f _id,name,age/o F:\DbSoft\mongodb\export_file\abc.dat2015-12-02t15:01:06.787+0800 Connected

GDB debugging C + + classesThe common tool for debugging on Linux is gdb. Learn about GDB's general debugging skills with the opportunity to learn C + + virtual function tables and memory layouts.One, test cases1,c++ header file (szyu_test_gdb.h)/***

One, MongoDB command line startup option configurationMongoDB command line start when we can choose some options to change the configuration, the specific options are as follows:1 、--dbpath: Each mongodb will need a separate data storage directory,

MongoDB Data Import and exportThe Mongoexport in MongoDB is responsible for data exportThe Mongoimport in MongoDB is responsible for data importThe Mongoexport tool allows you to export data tables in MongoDB to a file in JSON or CSV formatExport

1. Debug Core dump Fileulimit-c 1024: Set coredump file size to 1024, otherwise coredump file is not generated by defaultgdb-c core:gdb Debugging the Coredump fileFile a.out: Specifying symbol table FilesBT: Print stack information2, insert

First, the debugging instructions1.list command　　　List LineNum shows the program around the LineNum lineThe list function displays the source program for functions that have a program nameList shows the source program after the current

Data export Mongoexport Suppose there's a user table in the library with 2 records, and we're going to export it> Use My_mongodbSwitched to DB My_mongodb> Db.user.find ();{"_id": ObjectId ("4f81a4a1779282ca68fd8a5a"), "UID": 2, "username": "Jerry", "

Export MongoDB data based on time filtering1. Convert the time in MongoDB to a timestamp first:Isodate ("2016-12-01 00:00:00.000+08:00"). ValueOf ()1334592000000Then you can query based on the time stamp obtained.Export:- D is the database- c is a

1. View Source code:list [function name] [number of rows]2. Suspend the program(1) Set breakpoints:A, break + [source code line number] [source code function name] [memory address]B, break ... if condition ... Can be any one of these parameters,

Data Export Mongoexport Suppose there's a user table in the library with 2 records, and we're going to export it> Use My_mongodbSwitched to DB My_mongodb> Db.user.find ();{"_id": ObjectId ("4f81a4a1779282ca68fd8a5a"), "UID": 2, "username": "Jerry",

Single-precision floating-point number with 4 bytes (32bit) for floating-point numbers, using the IEEE754 standard computer floating-point number, in the interior is a binary representation, such as: 7.22 with 32-bit binary is not the case, so it

How to use common commands:1.echo (printf)Echo-display a line of text Common options:-N: Do not wrap,-e: use \ Guided escape sequence to take effect; \ n: newline \ t: Horizontal tab 2.CD Change the shell working dir Ectory. Switch working

Http://blog.chinaunix.net/uid-23193900-id-3184605.html1. What is program debugging? The purpose of the program debugging is to find out the hidden faults in the program, correct those abnormal instructions, so that the program can work properly. 2.

mongodb{First, start {# Do not start authentication./mongod--port 27017--fork--logpath=/opt/mongodb/mongodb.log--logappend--dbpath=/opt/mongodb/data/# Start Authentication./mongod--port

Dbgprint output1) Print the string directly.Dbgprint ("Hello world!");2) null-terminated string, you can use normal C syntax to represent string constantsChar variable_string[] = "Hello World";Dbgprint ("%s", variable_string);3) empty end of wide

Think a lot of friends are not how to use the float type in MySQL, especially when it comes to money we may use double precision, we know that the type of float of MySQL is single precision floating point type is careless will cause data

First, installation and landing commands1. Enter the graphical interfaceStartX2. Enter the graphical interfaceInit 53. Enter the character interfaceInit 34. LoginLogin5. Shut down the machinePoweroff-P Turn off the power when shutting down the

I. Overview of RAID1.1RAID (redundant Arrays of inexpensive Disks) inexpensive redundant disk arrayConsolidate multiple small/low-speed disks into one large disk with hardware/software technology1.2 Classification 1.2.1 RAID0Stripe modeAt least two

ManagementIn a unix/linux system, everything is a file, or a process if it is not a file. First recognize the file system:Linux file system/var-frequently changing (variable) files, such as logs or databases/USR-contains applications and files that