Function ExModifyDataDBFunc

src/vm/luavm/lmylib.cpp:1476–1510

*bool ExModifyDataDBFunc(const void* const key,const uint8_t keylen, const void* const pvalue,const uint16_t valuelen) * 中间层传了两个参数 * 1.第一个是 key * 2.第二个是 value */

 * 2.第二个是 value
 */
int32_t ExModifyDataDBFunc(lua_State *L) {
    vector<std::shared_ptr < vector<uint8_t> > > retdata;
    if (!GetDataTableWriteDataDB(L,retdata) ||retdata.size() != 2) {
        return RetFalse("ExModifyDataDBFunc key err");
    }

    string key((*retdata.at(0)).begin(), (*retdata.at(0)).end());
    string newValue((*retdata.at(1)).begin(), (*retdata.at(1)).end());

    CLuaVMRunEnv* pVmRunEnv = GetVmRunEnv(L);
    if (nullptr == pVmRunEnv) {
        return RetFalse("pVmRunEnv is nullptr");
    }

    CRegID contractRegId = pVmRunEnv->GetContractRegID();
    CContractDBCache* scriptDB = pVmRunEnv->GetScriptDB();
    string oldValue;
    bool flag = false;
    if (scriptDB->GetContractData(contractRegId, key, oldValue)) {
        if (scriptDB->SetContractData(contractRegId, key, newValue)) {
            lua_BurnStoreSet(L, key.size(),  oldValue.size(), newValue.size(), BURN_VER_R2);
            flag = true;
        } else {
            lua_BurnStoreUnchanged(L, key.size(), newValue.size(), BURN_VER_R2);
        }
    } else {
        lua_BurnStoreUnchanged(L, key.size(), newValue.size(), BURN_VER_R2);
    }
    #ifdef TRACE_LUAVM_CONTRACT_DATA
        LogPrint(BCLog::LUAVM, "ModifyData(), contract_regid=%s, key=%s, key_hex=%s, new_value=%s, new_value_hex=%s\n",
            contractRegId.ToString(), key, HexStr(key), newValue, HexStr(newValue));
    #endif//TRACE_LUAVM_CONTRACT_DATA

    return RetRstBooleanToLua(L,flag);
}


static bool GetDataTableWriteOutput(lua_State *L, CVmOperate &operate) {