将MYSQL DB与Android应用程序连接

Question

伙计们我的主要目标是将此数据库与我的Android应用程序连接但由于某种原因我已经收到连接错误而无法弄明白。所以我得到了stackoverflow来为我排序

下面给出的是我主要活动的SC

//LIBRARIES
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

//GLOBAL VARS
const char *filename = NULL;      //file name
FILE *file;                       //file stream
int page_number=1;                //number of current page
int line_count;
int page_total=0;

//PROTOTYPES METHODS
int prompt(void);
int print_page(int num_page_print);  

int main(int argc, char *argv[]) {
    int i;  //loop counter
    char name[50]; //name of file

    //read the name of the file from command line
    if(argc!=2) {
        printf("Specify input on command line.\n");
        scanf("%s", name);
        filename = name;
    }
    else if(argv[1]!=NULL)
             filename=argv[1];
         else
             return 1; //error

    //try to open the file
    file=fopen(filename, "rt");
    if(file == NULL){
        printf("Cannot open the file! %s \n",filename);
        return 1; //error
    }
    prompt();                       //call for prompt
    fclose(file);                   //close file
    return 0;                       //everything has gone as supposed :-)
}

int prompt(void) {
    char *cmd=NULL;                  //cmd
    cmd=malloc(2*sizeof(char*));         //allocate two bit for command
    char line[100];

    while(fgets(line, sizeof(line), file)!=NULL)  //count file lines
        line_count++;

    rewind(file); 

    //number of total pages  
    if(line_count%40==0)
        page_total=line_count/40;
    else
        page_total=line_count/40+1;

    //printf("\nTotal pages are %d\n",page_total);
    //while cmd!=q, continue to show prompt >>
    while(1){
        //VIEW ALL COMMANDS
        printf("a: next page; i: previous page; q: quit\n"); 
        printf(">> ");
        scanf("%s", cmd);
        //next page
        if(page_number!=page_total && strcmp(cmd,"n")==0){
            print_page(page_number+1);               //print next page
            page_number++;                           //update number of page
        }
        //prev page
        if(page_number!=1 && strcmp(cmd,"p")==0){
            print_page(page_number-1);               //print prev page
            page_number--;                           //update number of page
        }
        //exit
        if(strcmp(cmd, "q")==0){
            free(cmd);                       //free memory
            return 0;                          //success, return zero
        }
    }
}
//My problems start here
int print_page(int num_page_print) {
    char line[100]; 
    int i;

    if(num_page_print < page_number)
        //fseek change offset to print prev page
    else 
        //fseek change offset to print next page

    for(i = 0; i < 40; i++) {
        fread(line, sizeof(line),1, file); 
        //how do I print lines that have different lengths!
        printf("[%d] %s\n",i+1, line);
    }
}
//Any comments, reccomendations and critics are welcome :-)`