sqlite环境下的数据库

#include <stdio.h>
#include <stdlib.h>
#include <sqlite3.h>
#include <string.h>
#define     LEN     20
#define     TAB_NAME "room"
#define     SIZE    1024
sqlite3 *db = NULL;
char** result;
char buffer[1024];          //send buffer to Android
int nx,ny;
char* errmsg;
int ret;
char tab[20];               //sql command sqace
char a[7] = {'"','"','(',')',',';','*'};
char* create_tab_name(char tab[20]);     //build  tab command tab[20]
void create_tab(sqlite3* db);            //do create_tab command
char* cmd_insert(char tab[20],char* device,char* status);
char* sql_insert(char* device,char* status);
char* cmd_delete(char tab[20],char* device);
void sql_delete(char* device);
char*  sql_to_android(char tab[20]);

char*  sql_to_android(char tab[20])
{
    int i,j;
    memset(tab,LEN);
    strcat(tab,"select * from room");
    ret = sqlite3_get_table(db,tab,&result,&ny,&nx,&errmsg);
    if (ret != SQLITE_OK)
        printf("serch the room data failedn");
    else
        printf("serch thr room data succeedn");

    printf("nx = %dn",nx);
    printf("ny = %dn",ny);

    memset(buffer,SIZE);
    strcat(buffer,"R");
    
    for(i = 1; i< ny+1; i++)
    {
        strcat(buffer,":");
        for (j=0; j< nx; j++)
        {
            strcat(buffer,result[i*nx+j]);
        }
    }

/*    for (i= nx; i<(ny+1)*nx; i++)
    {
        strcat(buffer,":");
        strcat(buffer,result[i]);
        printf("string: %sn",result[i]);
    }
 */
    printf("send_to_android: %sn",buffer);
    
}

char* cmd_update(char* device,char* sta)
{
    memset(tab,"update room set sta = ");
    strncat(tab,&a[0],1);
    strcat(tab,sta);
    strncat(tab," where device = ");
    strncat(tab,device);
    strncat(tab,1);
    strncat(tab,&a[5],1);
    printf("string = %sn",tab);
    return tab;
}

void sql_update(char* device,char* sta)
{
    cmd_update(device,sta);
    ret = sqlite3_exec(db,NULL,&errmsg);
    if (ret != SQLITE_OK)
        printf("sql update failedn");
    else 
        printf("sql update succeedn");
    return;
}

char* cmd_search(char tab[20],char* device)
{
    /*
     select * from room where device = %s
     */
    memset(tab,"select * from room where device = ");
    strcat(tab,device);
    printf("string: %sn",tab);
    return tab;
}

void sql_search(char* device)
{
    ret = sqlite3_exec(db,&errmsg);
    if (ret != SQLITE_OK)
        printf("sql search failedn");
    else 
          printf("sql search succeedn");
    return;
}

char* cmd_delete(char tab[20],char* device)
{
    memset(tab,"delete from room where device = ");
    strcat(tab,tab);
    return tab;
}

void sql_delete(char* device)
{
    cmd_delete(tab,device);
    ret = sqlite3_exec(db,&errmsg);
    if (ret != SQLITE_OK)
        printf("sql delete failedn");
    else
        printf("sql delete succeedn");
    return;
}

char* cmd_insert(char tab[20],char* status)
{
    memset(tab,"insert into room values");
    strncat(tab,&a[2],1); // (
    strncat(tab,1); // "
    strcat(tab,device);    // device
    strncat(tab,&a[1],1); // "
    strncat(tab,&a[4],1); //,strncat(tab,status);    // status
    strncat(tab,&a[3],1); // )
    strncat(tab,1); // ;
    return tab;
}

char* sql_insert(char* device,char* status)
{
  cmd_insert(tab,device,status);
  ret = sqlite3_exec(db,&errmsg);
  if (ret != SQLITE_OK)
      printf("sql insert failedn");
  else 
      printf("sql insert successen");
  return;
}

void tab_insert(sqlite3* db,char* status)
{
    ret = sqlite3_exec(db,&errmsg);
    if (ret != SQLITE_OK)
        printf("create room tab failednyou have created tab !!!!!!n");
    else 
        printf("crate root tab succeedn");
}

char* create_tab_name(char tab[20])
{
    memset(tab,"create table ");
    strcat(tab,TAB_NAME);
    strcat(tab,"(device varchar(2),sta varchar(1));");
    return tab;
}

void create_tab(sqlite3* db)
{
    create_tab_name(tab);
    ret = sqlite3_exec(db,&errmsg);
    if (ret != SQLITE_OK)
    {
        printf("create room tab failednyou have created tab !!!!!!n");
    } else {
        printf("crate root tab succeedn");
    }
    return;
}

int main(int argc,char *argv[])
{
    ret = sqlite3_open("uwan.db",&db);
    if (SQLITE_OK != ret)
    {
        printf("open uwan.db failedn");
        exit(0);
    } else {
        printf("open uwan.db succeedn");
    }

    create_tab(db);
    sql_insert("11","N");
    sql_insert("12","N");
    sql_insert("13","N");
    sql_insert("14","F");
    sql_insert("15","F");

  //  sql_delete("14");

    cmd_search(tab,"11");
    sql_to_android(tab);
    sql_update("13","F");
    sql_search("12");
    sqlite3_close(db);
    printf("close uwan.db succedn");
    
    return 0;
}

（编辑：李大同）

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