Question

我试图将二进制文件插入sqlite数据库。我得到＆＃34;绑定或列索引超出范围＆＃34;错误。我不知道为什么我会收到这个错误，一切似乎都井然有序。我用评论标记了错误的位置。我已经仔细检查过文件是否存在且尺寸是否正确。

private void InsertBlob(uint PID, uint MID, int CR, int CG, int CB){
    ifstream file("my_file.bin", ios::in | ios::binary);
    file.seekg(0, ifstream::end);
    streampos size = file.tellg();
    file.seekg(0);

    //read file to buffer
    char* buffer = new char[size];
    file.read(buffer, size);

    //C++ string build, MBinary is blob others are Integers
    string Command = "BEGIN; INSERT INTO Dat (PID,MID,CID_R,CID_G,CID_B,MBinary) VALUES (" + to_string(PID) + "," + to_string(MID) + "," + to_string(CR) + "," + to_string(CG) + "," + to_string(CB) + ",?);COMMIT;";

    //convert string to char
    char c_style_string[1024];
    strncpy(c_style_string, Command.c_str(), sizeof(c_style_string));
    c_style_string[sizeof(c_style_string) - 1] = 0;

    int rc;

    sqlite3_open("AnalysisDatabase.db3", &db);
    sqlite3_stmt *stmt = NULL;
    rc = sqlite3_prepare_v2(db,c_style_string,-1, &stmt, NULL);

    **//following line throws the error: bind or column index out of range**
    rc = sqlite3_bind_blob(stmt, 1, buffer, size, SQLITE_STATIC);

    rc = sqlite3_step(stmt);
    sqlite3_finalize(stmt);
    sqlite3_close(db);

}

Answer 1

您绑定到明确没有占位符的语句BEGIN。您需要使用多个语句。 sqlite3_prepare_v2的最后一个参数设置指向分号后面的下一个语句的指针。

以下是您的代码的修改版本：

sqlite3_exec(db, "BEGIN", NULL, NULL, NULL);

char const* const command = "INSERT INTO Dat (PID, MID, CID_R, CID_G, CID_B, MBinary)"
                            " VALUES (?, ?, ?, ?, ?, ?)";

sqlite3_open("AnalysisDatabase.db3", &db);
sqlite3_stmt* stmt = NULL;
int rc = sqlite3_prepare_v2(db, command, -1, &stmt, NULL);

// Note: you're not handling rc. Also, why were you concatenating strings
// instead of binding params, like you were already doing for the blob?
rc = sqlite3_bind_int(stmt, 1, PID);
rc = sqlite3_bind_int(stmt, 2, MID);
rc = sqlite3_bind_int(stmt, 3, CT);
rc = sqlite3_bind_int(stmt, 4, CG);
rc = sqlite3_bind_int(stmt, 5, CB);
rc = sqlite3_bind_blob(stmt, 6, buffer, size, SQLITE_STATIC);

rc = sqlite3_step(stmt);
sqlite3_finalize(stmt);

sqlite3_exec(db, "COMMIT", NULL, NULL, NULL);

修改：您在原始代码中也没有delete buffer。您需要开始使用RAII来管理资源。

sqlite插入blob - 绑定或列索引超出范围

1 个答案: