c++ 之连接sqlite数据库（vsode）

Tasks.json中添加配置"-lsqlite3"

#include<sqlite3.h>
#include<iostream>
#include<errno.h>


static int callback1(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;
}

static int callback_insert(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;
}

/*
    void *data: 这是用户定义的数据，通常在调用 sqlite3_exec 时传入。
    int argc: 这是结果集中列的数量。
    char **argv[]: 这是一个指向字符串数组的指针，数组中的每个元素都是结果集中对应列的值。
    char **azColName[]: 这是一个指向列名的字符串数组的指针。
*/
static int callback_select(void *data, int argc, char **argv, char **azColName){
   int i;
   fprintf(stderr, "%s: ", (const char*)data);
   for(i=0; i<argc; i++){
      printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
   }
   printf("\n");
   return 0;
}

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

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


int main(){
  std::cout<<"asdf"<<std::endl;
  sqlite3 *db;  
  char *sql;
  char *zErrMsg = 0;
  const char* data = "Callback function called";

    int rc = sqlite3_open("/home/trc/cPlus/data.db",&db);
     if( rc ){
      fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
      exit(0);
   }else{
      fprintf(stderr, "Opened database successfully\n");
   }
   /* Create  SQL statement */
   sql = "CREATE TABLE INF("  \
         "ID INT PRIMARY KEY     NOT NULL," \
         "NAME           TEXT    NOT NULL," \
         "AGE            INT     NOT NULL," \
         "ADDRESS        CHAR(50)," \
         "SALARY         REAL );";
         /* Execute SQL statement */
   rc = sqlite3_exec(db, sql, callback1, 0, &zErrMsg);
   if( rc != SQLITE_OK ){
   fprintf(stderr, "SQL error: %s\n", zErrMsg);
      sqlite3_free(zErrMsg);
   }else{
      fprintf(stdout, "Table created successfully\n");
   }


    /* Create SQL statement */
   sql = "INSERT INTO INF (ID,NAME,AGE,ADDRESS,SALARY) "  \
         "VALUES (1, 'Paul', 32, 'California', 20000.00 ); " \
         "INSERT INTO INF (ID,NAME,AGE,ADDRESS,SALARY) "  \
         "VALUES (2, 'Allen', 25, 'Texas', 15000.00 ); "     \
         "INSERT INTO INF (ID,NAME,AGE,ADDRESS,SALARY)" \
         "VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );" \
         "INSERT INTO INF (ID,NAME,AGE,ADDRESS,SALARY)" \
         "VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 );";

   /* Execute SQL statement */
   rc = sqlite3_exec(db, sql, callback_insert, 0, &zErrMsg);
   if( rc != SQLITE_OK ){
      fprintf(stderr, "SQL error: %s\n", zErrMsg);
      sqlite3_free(zErrMsg);
   }else{
      fprintf(stdout, "Records created successfully\n");
   }


/* Create SQL statement */
   sql = "SELECT * from INF";

   /* Execute SQL statement */
   rc = sqlite3_exec(db, sql, callback_select, (void*)data, &zErrMsg);
   /*SQLITE_OK：成功。
SQLITE_ERROR：一般性错误。
SQLITE_BUSY：数据库忙。*/
   if( rc != SQLITE_OK ){
      fprintf(stderr, "SQL error: %s\n", zErrMsg);
      sqlite3_free(zErrMsg);
   }else{
      fprintf(stdout, "Operation done successfully\n");
   }


/* Create merged SQL statement */
   sql = "UPDATE INF set SALARY = 25000.00 where ID=1; " \
         "SELECT * from INF";

   /* Execute SQL statement */
   rc = sqlite3_exec(db, sql, callback_update, (void*)data, &zErrMsg);
   if( rc != SQLITE_OK ){
      fprintf(stderr, "SQL error: %s\n", zErrMsg);
      sqlite3_free(zErrMsg);
   }else{
      fprintf(stdout, "Operation done successfully\n");
   }

    /* Create merged SQL statement */
   sql = "DELETE from INF where ID=2; " \
         "SELECT * from INF";

   /* Execute SQL statement */
   rc = sqlite3_exec(db, sql, callback_delete, (void*)data, &zErrMsg);
   if( rc != SQLITE_OK ){
      fprintf(stderr, "SQL error: %s\n", zErrMsg);
      sqlite3_free(zErrMsg);
   }else{
      fprintf(stdout, "Operation done successfully\n");
   }

   sqlite3_close(db);
    return 0;
}