Visual Basic / SQL Server：identity_insert设置为off error

Question

我刚刚开始玩弄所有这些编程内容，所以我不太清楚如何解决我在服务器和客户端之间的通信时遇到的一个小问题。

当我启动服务器时，玩家可以在完成播放时连接并注销而不会出现任何问题，但服务器会抛出错误并且不会将项目保存在表items中。 / p>

几乎就像服务器/客户端无法与dbo.items表正确通信一样：/

任何帮助将不胜感激！谢谢。

抱歉英语不好

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;

namespace Goose
{
    /**
     * Item, holds the actual item data
     * 
     * Each item in game is separate
     * Holds the original template and modified/added stats
     * 
     */
    public class Item : IItem
    {
        public int ItemID { get; set; }
        public int TemplateID { get; set; }
        public ItemTemplate Template { get; set; }

        public string Name { get; set; }
        public string Description { get; set; }

        public int GraphicEquipped { get; set; }
        public int GraphicTile { get; set; }
        public int GraphicR { get; set; }
        public int GraphicG { get; set; }
        public int GraphicB { get; set; }
        public int GraphicA { get; set; }

        int weapondamage = 0;

        public int WeaponDamage 
        {
            get
            {
                return this.weapondamage + (int)Math.Ceiling(this.Template.WeaponDamage * this.StatMultiplier);
            }
            set
            {
                this.weapondamage = value;
            }
        }

        /**
         * Body pose/state 1 for normal, 3 for staff, 4 for sword
         */
        public int BodyState { get; set; }

        public AttributeSet BaseStats { get; set; }
        public AttributeSet TotalStats { get; set; }

        public decimal StatMultiplier { get; set; }
        /**
         * Dirty, has data changed since loading
         * 
         */
        public bool Dirty { get; set; }
        /**
         * Delete, item is no longer in game so delete it
         */
        public bool Delete { get; set; }
        public long Value { get; set; }

        bool bound = false;
        public bool IsBound
        {
            get { return this.bound; }
            set { this.bound = value; }
        }

        /**
         * These properties are read only and just pass along from the templates properties
         * 
         */
        public int WeaponDelay { get { return this.Template.WeaponDelay; } }
        public int StackSize { get { return this.Template.StackSize; } }
        public bool IsLore { get { return this.Template.IsLore; } }
        public bool IsBindOnPickup { get { return this.Template.IsBindOnPickup; } }
        public bool IsBindOnEquip { get { return this.Template.IsBindOnEquip; } }
        public bool IsEvent { get { return this.Template.IsEvent; } }
        public ItemTemplate.ItemSlots Slot { get { return this.Template.Slot; } }
        public ItemTemplate.ItemTypes Type { get { return this.Template.Type; } }
        public ItemTemplate.UseTypes UseType { get { return this.Template.UseType; } }
        public int MinLevel { get { return this.Template.MinLevel; } }
        public int MaxLevel { get { return this.Template.MaxLevel; } }
        public long MinExperience { get { return this.Template.MinExperience; } }
        public long MaxExperience { get { return this.Template.MaxExperience; } }
        /**
         * This is a bitmask
         * Therefore only limited to about 64 classes, which should be enough.
         * If the bit is set then that class id CAN'T use the item.
         * 
         */
        public long ClassRestrictions { get { return this.Template.ClassRestrictions; } }
        public SpellEffect SpellEffect { get { return this.Template.SpellEffect; } }
        public decimal SpellEffectChance { get { return this.Template.SpellEffectChance; } }
        public int LearnSpellID { get { return this.Template.LearnSpellID; } }

        public bool Unsaved { get; set; }

        public Item()
        {
            this.Unsaved = true;
            this.ItemID = 0;
            this.TotalStats = new AttributeSet();
            this.BaseStats = new AttributeSet();
            this.StatMultiplier = 1;
            this.Dirty = true;
            this.Delete = false;
        }

        /**
         * LoadFromTemplate, loads item from a template
         * 
         * This is when we want an item the same as the template.
         * 
         */
        public void LoadFromTemplate(ItemTemplate template)
        {
            this.Template = template;
            this.TemplateID = this.Template.ID;
            this.TotalStats += this.Template.BaseStats;

            this.Name = this.Template.Name;
            this.Description = this.Template.Description;
            this.GraphicEquipped = this.Template.GraphicEquipped;
            this.GraphicTile = this.Template.GraphicTile;
            this.GraphicR = this.Template.GraphicR;
            this.GraphicG = this.Template.GraphicG;
            this.GraphicB = this.Template.GraphicB;
            this.GraphicA = this.Template.GraphicA;

            this.Value = this.Template.Value;
            this.BodyState = this.Template.BodyState;
        }

        /**
         * LoadTemplate, adds template to item
         * 
         * This is when we want to just add the templates stats to our item
         * ie when loading the items database, eg for surname/titled items
         * 
         * Note: Doesn't load the value from the template as we want to keep the value as 0
         * if the item is custom for example
         * 
         */
        public void LoadTemplate(ItemTemplate template)
        {
            this.TotalStats += template.BaseStats;
            this.TotalStats *= this.StatMultiplier;
            this.TotalStats += this.BaseStats;
        }

        /**
         * AddItem, adds item to database
         * 
         */
        public void AddItem(GameWorld world)
        {
            SqlParameter nameParam = new SqlParameter("@itemName", SqlDbType.VarChar, 64);
            nameParam.Value = this.Name;
            SqlParameter descriptionParam = new SqlParameter("@itemDescription", SqlDbType.VarChar, 64);
            descriptionParam.Value = this.Description;

            string query = "INSERT INTO items (item_id, item_template_id, item_name, item_description, " +
            "player_hp, player_mp, player_sp, stat_ac, stat_str, stat_sta, stat_dex, stat_int, " +
            "res_fire, res_water, res_spirit, res_air, res_earth, weapon_damage, item_value, " +
            "graphic_tile, graphic_equip, graphic_r, graphic_g, graphic_b, graphic_a, stat_multiplier, " +
            "bound, body_state) VALUES (" +
            this.ItemID + "," +
            this.TemplateID + ", " +
            "@itemName, " +
            "@itemDescription, " +
            this.BaseStats.HP + ", " +
            this.BaseStats.MP + ", " +
            this.BaseStats.SP + ", " +
            this.BaseStats.AC + ", " +
            this.BaseStats.Strength + ", " +
            this.BaseStats.Stamina + ", " +
            this.BaseStats.Dexterity + ", " +
            this.BaseStats.Intelligence + ", " +
            this.BaseStats.FireResist + ", " +
            this.BaseStats.WaterResist + ", " +
            this.BaseStats.SpiritResist + ", " +
            this.BaseStats.AirResist + ", " +
            this.BaseStats.EarthResist + ", " +
            this.weapondamage + ", " +
            this.Value + ", " +
            this.GraphicTile + ", " +
            this.GraphicEquipped + ", " +
            this.GraphicR + ", " +
            this.GraphicG + ", " +
            this.GraphicB + ", " +
            this.GraphicA + ", " +
            this.StatMultiplier + ", " +
            (this.bound ? "'1'" : "'0'") + ", " +
            this.BodyState + ")";

            this.Dirty = false;

            this.Unsaved = false;

            SqlCommand command = new SqlCommand(query, world.SqlConnection);
            command.Parameters.Add(nameParam);
            command.Parameters.Add(descriptionParam);
            command.BeginExecuteNonQuery(new AsyncCallback(GameWorld.DefaultEndExecuteNonQueryAsyncCallback), command);
        }

        /**
         * SaveItem, updates item info in database
         * 
         */
        public void SaveItem(GameWorld world)
        {
            SqlParameter nameParam = new SqlParameter("@itemName", SqlDbType.VarChar, 64);
            nameParam.Value = this.Name;
            SqlParameter descriptionParam = new SqlParameter("@itemDescription", SqlDbType.VarChar, 64);
            descriptionParam.Value = this.Description;

            string query = "UPDATE items SET " +
                "item_template_id=" + this.TemplateID + ", " +
                "item_name=" + "@itemName, " +
                "item_description=" + "@itemDescription, " + 
                "player_hp=" + this.BaseStats.HP + ", " +
                "player_mp=" + this.BaseStats.MP + ", " +
                "player_sp=" + this.BaseStats.SP + ", " +
                "stat_ac=" + this.BaseStats.AC + ", " +
                "stat_str=" + this.BaseStats.Strength + ", " +
                "stat_sta=" + this.BaseStats.Stamina + ", " +
                "stat_dex=" + this.BaseStats.Dexterity + ", " +
                "stat_int=" + this.BaseStats.Intelligence + ", " + 
                "res_fire=" + this.BaseStats.FireResist + ", " +
                "res_water=" + this.BaseStats.WaterResist + ", " +
                "res_spirit=" + this.BaseStats.SpiritResist + ", " +
                "res_air=" + this.BaseStats.AirResist + ", " +
                "res_earth=" + this.BaseStats.EarthResist + ", " +
                "weapon_damage=" + this.weapondamage + ", " +
                "item_value=" + this.Value + ", " + 
                "graphic_tile=" + this.GraphicTile + ", " +
                "graphic_equip=" + this.GraphicEquipped + ", " +
                "graphic_r=" + this.GraphicR + ", " +
                "graphic_g=" + this.GraphicG + ", " +
                "graphic_b=" + this.GraphicB + ", " +
                "graphic_a=" + this.GraphicA + ", " +
                "stat_multiplier=" + this.StatMultiplier + ", " +
                "bound=" + (this.bound ? "'1'" : "'0'") + ", " +
                "body_state=" + this.BodyState + 
                " WHERE item_id=" + this.ItemID;

            SqlCommand command = new SqlCommand(query, world.SqlConnection);
            command.Parameters.Add(nameParam);
            command.Parameters.Add(descriptionParam);
            command.BeginExecuteNonQuery(new AsyncCallback(GameWorld.DefaultEndExecuteNonQueryAsyncCallback), command);
            this.Dirty = false;
        }

        /**
         * DeleteItem, deletes item from database
         * 
         */
        public void DeleteItem(GameWorld world)
        {
            SqlCommand command = new SqlCommand(
                "DELETE FROM items WHERE item_id=" + this.ItemID, 
                world.SqlConnection);
            command.BeginExecuteNonQuery(new AsyncCallback(GameWorld.DefaultEndExecuteNonQueryAsyncCallback), command);
        }
    }
}

Answer 1

   public void AddItem(GameWorld world)
    {
        SqlParameter nameParam = new SqlParameter("@itemName", SqlDbType.VarChar, 64);
        nameParam.Value = this.Name;
        SqlParameter descriptionParam = new SqlParameter("@itemDescription", SqlDbType.VarChar, 64);
        descriptionParam.Value = this.Description;

        string query = "INSERT INTO items (item_template_id, item_name, item_description, " +
        "player_hp, player_mp, player_sp, stat_ac, stat_str, stat_sta, stat_dex, stat_int, " +
        "res_fire, res_water, res_spirit, res_air, res_earth, weapon_damage, item_value, " +
        "graphic_tile, graphic_equip, graphic_r, graphic_g, graphic_b, graphic_a, stat_multiplier, " +
        "bound, body_state) VALUES (" +
        this.TemplateID + ", " +
        "@itemName, " +
        "@itemDescription, " +
        this.BaseStats.HP + ", " +
        this.BaseStats.MP + ", " +
        this.BaseStats.SP + ", " +
        this.BaseStats.AC + ", " +
        this.BaseStats.Strength + ", " +
        this.BaseStats.Stamina + ", " +
        this.BaseStats.Dexterity + ", " +
        this.BaseStats.Intelligence + ", " +
        this.BaseStats.FireResist + ", " +
        this.BaseStats.WaterResist + ", " +
        this.BaseStats.SpiritResist + ", " +
        this.BaseStats.AirResist + ", " +
        this.BaseStats.EarthResist + ", " +
        this.weapondamage + ", " +
        this.Value + ", " +
        this.GraphicTile + ", " +
        this.GraphicEquipped + ", " +
        this.GraphicR + ", " +
        this.GraphicG + ", " +
        this.GraphicB + ", " +
        this.GraphicA + ", " +
        this.StatMultiplier + ", " +
        (this.bound ? "'1'" : "'0'") + ", " +
        this.BodyState + ")";

        this.Dirty = false;

        this.Unsaved = false;

        SqlCommand command = new SqlCommand(query, world.SqlConnection);
        command.Parameters.Add(nameParam);
        command.Parameters.Add(descriptionParam);
        command.BeginExecuteNonQuery(new AsyncCallback(GameWorld.DefaultEndExecuteNonQueryAsyncCallback), command);
    }

不要插入列item_id，因为它是标识，它将自动插入