MySQL嵌入式版本的小程序例子

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MySQL嵌入式版本越来越式微了。碰巧有个小应用用到了它，顺便记录一下。

文档可以参考http://dev.mysql.com/doc/refman/5.6/en/libmysqld-example.html，看起来年久失修的样子，没法一看就懂。

希望下面这个简化的步骤可以起到点作用。

1. 下载代码并且进行版本编译。这个还比较简单，文档说的也很靠谱。

$ cmake . -DCMAKE_INSTALL_PREFIX=/home/mysql -DWITH_EMBEDDED_SERVER=1
$ make clean

$ make -j 8
$ make install

2. 写个小程序

$ ls
GNUmakefile main.cc my.cnf

具体代码就看附件好了，其实很简单。

$ make

3. 安装好MySQL，初始化一下
$ cd /home/mysql
$ scripts/mysql_install_db --defaults-file=/home/mysql/my.cnf

4. 启动小程序
$ ./main

附件：

# This assumes the MySQL software is installed in /usr/local/mysql#inc      := /usr/local/mysql/include/mysql#lib      := /usr/local/mysql/lib# If you have not installed the MySQL software yet, try this insteadtopdir   := /home/mysql/mysql-5.5.35inc      := $(topdir)/includelib      := $(topdir)/libmysqldCXX      := g++CPPFLAGS := -I$(inc) -D_THREAD_SAFE -D_REENTRANTCXXFLAGS := -g -WallLDFLAGS  := # You can change -lmysqld to -lmysqlclient to use the# client/server libraryLDLIBS    = -L$(lib) -lmysqld -lm -lcrypt -ldl -lz -lrtifneq (,$(shell grep FreeBSD /COPYRIGHT 2>/dev/null))# FreeBSDLDFLAGS += -pthreadelse# Assume LinuxLDLIBS += -pthreadendif# This works for simple one-file test programssources := $(wildcard *.cc)objects := $(patsubst %cc,%o,$(sources))targets := $(basename $(sources))all: $(targets)clean:rm -f $(targets) $(objects) *.core---#include <mysql.h>#include <iostream>#include <cassert>using namespace std;const char *server_options[] = \       { "mysql_test", "--defaults-file=my.cnf", NULL };int num_elements = (sizeof(server_options) / sizeof(char *)) - 1;const char *server_groups[]= { "libmysqld_server",                               "libmysqld_client",                               NULL};bool is_server_started= false;MYSQL *MySQL= NULL;const char *db= NULL;void start_server(){  cout << "enter start_server()" << endl;  if (mysql_library_init(num_elements, (char **) server_options, (char **) server_groups)) {    is_server_started= false;    cout << "ERROR: start server failed." << endl;  }  else {    is_server_started= true;    cout << "INFO: start server OK." << endl;  }}void stop_server(){  cout << "enter stop_server()" << endl;  mysql_server_end();}bool connect_server(){  cout << "enter connect_server()" << endl;  bool rc = true;  MySQL = mysql_init(NULL);  if (!MySQL)    return rc;  if (mysql_real_connect(MySQL, NULL, NULL, NULL, db, 0, NULL, 0))    rc = false;   MySQL->reconnect= 1;  return rc;}void output_rows(MYSQL_RES *res){  MYSQL_ROW row;  unsigned long n = 0;  while ((row= mysql_fetch_row(res)) != 0)  {    mysql_field_seek(res, 0);    for (unsigned int i= 0 ; i < mysql_num_fields(res); i++)      cout << "row[" << n++ << "]:"<< row[i] << endl;   }}bool get_dbs(){  MYSQL_RES *res;  if (!is_server_started)    return true;  if (!(res= mysql_list_dbs(MySQL, "%")))    return true;  output_rows(res);  mysql_free_result(res);  return false;}int main(int argc, char *argv[]){  start_server();  if (is_server_started) {    cout << "server started." << endl;    if (!connect_server()) {      get_dbs();    }    stop_server();  }  return 0;}---[libmysqld_client][libmysqld_server]basedir=/home/mysql/datadir=/home/mysql/datatmpdir=/home/mysql/tmplog-error=/home/mysql/alert.loglc_messages_dir=/home/mysql/shareinnodb_data_home_dir=/home/mysql/datainnodb_log_group_home_dir=/home/mysql/data

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