SQLite的使用（包括编译安装的步骤）

// 解压
tar zxvf sqlite-autoconf-3110000.tar.gz

// 安装
cd sqlite-autoconf-3110000
./configure --prefix=/usr/local
make
make install

sudo apt-get install sqlite3 libsqlite3-dev

gcc dbtest.c -o dbtest –lsqlite3

gcc dbtest.c -o dbtest -lsqlite3 -L.

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

int main(void)
{
    sqlite3 *db = NULL;
    int rc;
    // 打开数据库，不存在会创建一个新的
    rc = sqlite3_open("my.db",&db);
    if(rc)  // 不为0，打开失败
    {
        fprintf(stderr,"Can‘t open database:%s\n",sqlite3_errmsg(db));
        sqlite3_close(db);
        exit(0);
    }
    else
    {
        printf("open db success!\n");
        sqlite3_close(db);
    }
    return 0;
}

rc = sqlite3_exec(db, sql, 0, 0, &errorMsg);
if(errorMsg)
    printf("%s\n", errorMsg);
else
    printf("success!\n");

if( rc != SQLITE_OK )
{
    fprintf(stderr, "SQL error: %s\n", zErrMsg);
    sqlite3_free(zErrMsg);
}
else
{
    fprintf(stdout, "success!\n");
}

typedef int (*sqlite3_callback)(
void*,    /* Data provided in the 4th argument of sqlite3_exec() */
int,      /* The number of columns in row */
char**,   /* An array of strings representing fields in the row */
char**    /* An array of strings representing column names */
);

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

int sqlite3_get_table(
  sqlite3 *db,          /* An open database */
  const char *zSql,     /* SQL to be evaluated */
  char ***pazResult,    /* Results of the query */
  int *pnRow,           /* Number of result rows written here */
  int *pnColumn,        /* Number of result columns written here */
  char **pzErrmsg       /* Error msg written here */
);
// 不论数据库查询是否成功，都释放 char** 查询结果
void sqlite3_free_table(char **result);

result = sqlite3_get_table( db, “select * from table1”, &dbResult, &nRow, &nColumn, &errmsg );
if( SQLITE_OK == result )    // 查询成功
{
    index = nColumn;
    // dbResult 第一行数据是字段名称，从 nColumn 索引开始才是真正的数据
    printf( “查到%d条记录\n”, nRow );

    for(  i = 0; i < nRow ; i++ )
    {
         printf( “第 %d 条记录\n”, i+1 );
         for( j = 0 ; j < nColumn; j++ )
         {
              printf( “字段名:%s  >  字段值:%s\n”,  dbResult[j], dbResult [index] );
              ++index;
              // dbResult 的字段值是连续的，从第0索引到第 nColumn - 1索引都是字段名称，
　　　　　　　　// 从第 nColumn 索引开始，后面都是字段值
         }
         printf( “--------\n” );
    }
}
// 释放查询结果
sqlite3_free_table( dbResult );

char query(sqlite3 *db, const char *sql) {
    printf("%s\n", sql);
    char *select_str = "SELECT";
    char *errorMsg;
    char *str_str = strstr(sql, select_str);
    if(str_str) {
        printf("in it, %s\n", str_str);
        int row = 0, column = 0, i = 0;
        char **result;
        sqlite3_get_table(db, sql, &result, &row, &column, &errorMsg);
        printf("row:%d, column:%d\n", row, column);
        for(; i < column * (row + 1); i++) {
            printf("result[%d]=%s\n", i, result[i]);
        }
    }else{
        sqlite3_exec(db, sql, 0, 0, &errorMsg);
    }
    if(errorMsg){
        printf("%s\n", errorMsg);
    }else{
        printf("success!\n");
    }
}

#define SQLITE_OK           0   /* Successful result */
/* beginning-of-error-codes */
#define SQLITE_ERROR        1   /* SQL error or missing database */
#define SQLITE_INTERNAL     2   /* Internal logic error in SQLite */
#define SQLITE_PERM         3   /* Access permission denied */
#define SQLITE_ABORT        4   /* Callback routine requested an abort */
#define SQLITE_BUSY         5   /* The database file is locked */
#define SQLITE_LOCKED       6   /* A table in the database is locked */
#define SQLITE_NOMEM        7   /* A malloc() failed */
#define SQLITE_READONLY     8   /* Attempt to write a readonly database */
#define SQLITE_INTERRUPT    9   /* Operation terminated by sqlite3_interrupt()*/
#define SQLITE_IOERR       10   /* Some kind of disk I/O error occurred */
#define SQLITE_CORRUPT     11   /* The database disk image is malformed */
#define SQLITE_NOTFOUND    12   /* Unknown opcode in sqlite3_file_control() */
#define SQLITE_FULL        13   /* Insertion failed because database is full */
#define SQLITE_CANTOPEN    14   /* Unable to open the database file */
#define SQLITE_PROTOCOL    15   /* Database lock protocol error */
#define SQLITE_EMPTY       16   /* Database is empty */
#define SQLITE_SCHEMA      17   /* The database schema changed */
#define SQLITE_TOOBIG      18   /* String or BLOB exceeds size limit */
#define SQLITE_CONSTRAINT  19   /* Abort due to constraint violation */
#define SQLITE_MISMATCH    20   /* Data type mismatch */
#define SQLITE_MISUSE      21   /* Library used incorrectly */
#define SQLITE_NOLFS       22   /* Uses OS features not supported on host */
#define SQLITE_AUTH        23   /* Authorization denied */
#define SQLITE_FORMAT      24   /* Auxiliary database format error */
#define SQLITE_RANGE       25   /* 2nd parameter to sqlite3_bind out of range */
#define SQLITE_NOTADB      26   /* File opened that is not a database file */
#define SQLITE_NOTICE      27   /* Notifications from sqlite3_log() */
#define SQLITE_WARNING     28   /* Warnings from sqlite3_log() */
#define SQLITE_ROW         100  /* sqlite3_step() has another row ready */
#define SQLITE_DONE        101  /* sqlite3_step() has finished executing */
/* end-of-error-codes */