SQLite数据库Hello World

嵌入式数据库主要是Berkeley DB和SQLite,BDB功能很强可以应用于工业,但不是关系数据库,SQLite免费小巧且速度快。

1、下载源代码并编译安装
http://www.sqlite.org/download.html下载sqlite-autoconf-3080100.tar.gz,解压缩后./configure ; make ; make install,则生成了sqlite3程序和500多k的libsqlite3.so.0.8.6库文件
其中源代码包括sqlite3.c和sqlite3.h,sqlite3.h在程序中需要用到

2、程序部署
将库文件libsqlite3.so.0.8.6拷贝到部署机即可

3、测试程序

#include <stdio.h>
#include <sqlite3.h>

static int callback(void *NotUsed, int argc, char **argv, char **azColName){
   int i;
   for(i=0; i<argc; i++){
     printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
   }
   printf("\n");
   return 0;
}

int main(int argc, char **argv){
   sqlite3 *db;
   int rc;
   char *zErrMsg = 0;

//1.create or open database file
   rc = sqlite3_open("my.db", &db);
   if( rc ){
     fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
     sqlite3_close(db);
     exit(1);
   }
//2.create table
   rc = sqlite3_exec(db, "create table phonenumber(id int,name varchar(30));", NULL, 0, &zErrMsg);
   if( rc!=SQLITE_OK ){
     fprintf(stderr, "SQL error: %s\n", zErrMsg);
     sqlite3_free(zErrMsg);
   }

//3.insert data
  rc = sqlite3_exec(db, "insert into phonenumber values(1,'abc')", NULL, 0, &zErrMsg);
   if( rc!=SQLITE_OK ){
     fprintf(stderr, "SQL error: %s\n", zErrMsg);
     sqlite3_free(zErrMsg);
   }

//4.select and show data

   sqlite3_exec(db, "select * from phonenumber", callback, 0, &zErrMsg);
   if( rc!=SQLITE_OK ){
     fprintf(stderr, "SQL error: %s\n", zErrMsg);
     sqlite3_free(zErrMsg);
   }

   sqlite3_close(db);
   return 0;
}


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