SQLite 参数化查询

SQLite参数化查询

首先给出两个参考博客：

Sqlite DB

sqlite3使用简介

贴出一段自己用的代码：

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


int main(int argc, char* argv[])
{
   sqlite3 *db;
   char *zErrMsg = 0;
   int rc;
   char *sql;
   const char* data = "Callback function called";
   sqlite3_stmt *res;
   /* Open database */
   rc = sqlite3_open("test.db", &db);
   if( rc ){
      fprintf(stderr, "Can't open database: %s
", sqlite3_errmsg(db));
      exit(0);
   }else{
      fprintf(stderr, "Opened database successfully
");
   }
   /* Create SQL statement */
   sql = "SELECT count(*) from COMPANY WHERE ID = ? AND AGE = '32'";

   /* Execute SQL statement */
   rc = sqlite3_prepare_v2(db, sql, -1, &res, 0);
    if (rc == SQLITE_OK)
     {
        sqlite3_bind_int(res, 1, 1);//查询第一个问好处ID为1的条目
        printf("bind success!
");
    } 
    else {
        fprintf(stderr, "Failed to execute statement: %s
", sqlite3_errmsg(db));
    }
    int step = sqlite3_step(res);
   if (step == SQLITE_ROW) {
      printf("%d: ", sqlite3_column_int(res, 0));    //sqlite3_column_* 有多种形式
      //printf("%s
", sqlite3_column_text(res, 1));//若存在第二个问号，需要此句，但本处不需要
    }
    sqlite3_finalize(res);
    sqlite3_close(db);
    return 0;
}