Question

我试图通过重复使用预准备语句，使用事务和参数化查询来提高保存代码的效率。但是每当我运行保存代码时，我的表中只有一条记录结束。我认为这与放置sqlite3_step的位置有关。

但我也希望其他一些眼睛能够查看我的代码并让我知道我是否正确地做事;我无法在任何地方找到这样做的例子，所以我在各种主题上找到了大约六个论坛帖子和Stack Overflow主题的混乱：

//Planet Data

//Delete previous save data
dData("Generated_Planets", bErrors);

if (plData.size() > 0)
{
    sqlite3_exec(dBase, "BEGIN TRANSACTION", NULL, NULL, &error);

    sqlStr = "Insert Into Generated_Planets (ID, Name, Affiliation, Disposition, Race, Player_Owned, Is_Destroyed, EKS, Planet_Size, Current_Pop, Max_Pop) Values (?,?,?,?,?,?,?,?,?,?,?);";

    if (sqlite3_prepare_v2(dBase, sqlStr.c_str(), sqlStr.size(), &statement, 0) == SQLITE_OK)
    {
        cout << "Saving planet data";
        //Save new data
        for (i = 0; i <= plData.size(); i++)
        {
            if (i == plData.size())
            {
                finalize(statement, bErrors);
            }

            else
            {
                sqlI1 = plData.at(i).pID;
                sqlS1 = plData.at(i).pName;
                sqlS2 = plData.at(i).pAffiliation;
                sqlS3 = plData.at(i).pDispo;
                sqlS4 = plData.at(i).pRace;
                sqlI2 = plData.at(i).bIsPOwned;
                sqlI3 = plData.at(i).bIsDestroyed;
                sqlF1 = plData.at(i).pEKS;
                sqlF2 = plData.at(i).pSize;
                sqlLLI1 = plData.at(i).pCPop;
                sqlLLI2 = plData.at(i).pMPop;

                find = "'";
                temp = "\"";

                foundAt = sqlS1.find(find);

                if (foundAt != string::npos)
                {
                    sqlS1.replace(foundAt,1,temp);
                }

                //Bind parameters
                sqlite3_bind_int(statement,1,sqlI1);
                sqlite3_bind_text(statement,2,sqlS1.c_str(),sqlS1.size(),SQLITE_TRANSIENT);
                sqlite3_bind_text(statement,3,sqlS2.c_str(),sqlS2.size(),SQLITE_TRANSIENT);
                sqlite3_bind_text(statement,4,sqlS3.c_str(),sqlS3.size(),SQLITE_TRANSIENT);
                sqlite3_bind_text(statement,5,sqlS4.c_str(),sqlS4.size(),SQLITE_TRANSIENT);
                sqlite3_bind_int(statement,6,sqlI2);
                sqlite3_bind_int(statement,7,sqlI3);
                sqlite3_bind_double(statement,8,sqlF1);
                sqlite3_bind_double(statement,9,sqlF2);
                sqlite3_bind_int64(statement,10,sqlLLI1);
                sqlite3_bind_int64(statement,11,sqlLLI2);

                sqlite3_step(statement);

                cout << ".";
            }
        }
    }       

    else
    {
        *bErrors = true;
        createBInfo();      
        d.createBReport("SQL Code 2",sqlite3_errmsg(dBase),bLocale + to_string(__LINE__),bTDate,"./SC_Log.txt");    
    }

    sqlite3_exec(dBase, "END TRANSACTION", NULL, NULL, &error);

    sFlags_Temp.push_back(saveFlag());
    sFlags_Temp.at(sFlags_Temp.size()-1).sfName = "GPlanets";
    sFlags_Temp.at(sFlags_Temp.size()-1).sfValue = 1;
    cout << "Done" << endl << endl;
}

Answer 1

在sqlite3_reset之后以及绑定下一组参数之前，您似乎错过了对sqlite3_step的调用。并且你忽略了会告诉你的返回代码。

请在此处查看sqlite3_step的文档：http://sqlite.org/c3ref/step.html

SQLite3带参数的多个插入;仅插入一个记录

1 个答案: