一、菜单数据表中的存储结构
二、转换后的数据结构
三、 转换过程
1、确定菜单数据的最大级别
/// <summary>
/// 获得Nature定义的最大目录级别，以便于确定Nature的DataTable表结构中的列数目
/// </summary>
/// <returns></returns>
public int GetMaxNatureLevel()
{
if (dtNature == null && dtNature.Rows.Count == 0)
{
dtNature = GetNatureData();
}int maxLevel = 0;
foreach (DataRow dr in dtNature.Rows)
{
int currentLevel = 0;
GetLevelByNatureID(dr["natureid"].ToString(), ref currentLevel);
if (currentLevel > maxLevel)
{
maxLevel = currentLevel;
}
}
return maxLevel;
}public void GetLevelByNatureID(string natureid, ref int level)
{
if (dtNature == null || dtNature.Rows.Count == 0)
{
dtNature = GetNatureData();
}if (dtNature.Rows.Count > 0)
{
DataRow[] drs = dtNature.Select(string.Format("natureid=‘{0}‘", natureid));
if (drs.Count() > 0)
{
level++;
string parentid = drs[0]["parentid"].ToString();
DataRow[] drst = dtNature.Select(string.Format("natureid=‘{0}‘", parentid));
if (drst.Length > 0)
{
GetLevelByNatureID(parentid, ref level);
}
}
}
}
2、 构造存储该数据的表结构
/// <summary>
/// 依据Nature目录的最大级别，声明表的存储结构
/// </summary>
/// <returns></returns>
public DataTable DeclareNatureTable()
{
DataTable dt = new DataTable();
if (dtNature == null && dtNature.Rows.Count == 0)
{
dtNature = GetNatureData();
}
dt.Columns.Add("natureid");int MaxLevel = GetMaxNatureLevel();
for (int i = 1; i <= MaxLevel; i++)
{
dt.Columns.Add("nature" + i.ToString());
}
return dt;
}
三、 获得菜单数据的全部信息
/// <summary>
/// 获得数据库中Nature的所有信息
/// </summary>
/// <returns></returns>
public DataTable GetNatureData()
{
DataTable dt = new DataTable();
try
{
string sQuery = string.Format(" SELECT natureid,naturenm,parentid,seqnumbr FROM dbo.CRNATUREM0 WHERE dsblflag =0 ORDER BY seqnumbr ");
Database db = DatabaseFactory.CreateDatabase();
DataSet ds = db.ExecuteDataSet(CommandType.Text, sQuery);if (ds != null)
{
dt = ds.Tables[0];
}
}
catch (Exception ex)
{
MessageBox.Show("查询数据失败:" + ex.Message);
}
return dt;
}
四、将数据的树形存储转为线性存储
public DataTable GetNatureTable()
{
try
{
if (dtNature != null && dtNature.Rows.Count == 0)
{
dtNature = GetNatureData();
}dtResult = DeclareNatureTable(); // 声明表的结构
foreach (DataRow dr in dtNature.Rows)
{
DataRow drn = dtResult.NewRow();
string natureid = dr["natureid"].ToString();
drn["natureid"] = natureid;
int level = 0;
GetLevelByNatureID(natureid, ref level);
int leve11 = 0;
Dictionary<int, string> natureDict = new Dictionary<int, string>();
GetNatureValsByID(natureid, ref leve11,natureDict);
foreach (KeyValuePair<int, string> keyNature in natureDict)
{
string colName = "nature" + (level - keyNature.Key).ToString();
drn[colName] = keyNature.Value;
}
dtResult.Rows.Add(drn);
}
}
catch (Exception ex)
{
MessageBox.Show("查询数据失败:" + ex.Message);
}
return dtResult;
}/// <summary>
/// 依据Natureid 获得相应的所有级类目信息
/// </summary>
/// <param name="natureid"></param>
/// <param name="level"></param>
/// <param name="natureDict"></param>
public void GetNatureValsByID(string natureid, ref int level,Dictionary<int, string> natureDict)
{
if (dtNature != null && dtNature.Rows.Count == 0)
{
dtNature = GetNatureData();
}if (dtNature != null && dtNature.Rows.Count > 0)
{
DataRow[] drs = dtNature.Select(string.Format("natureid=‘{0}‘", natureid));
natureDict.Add(level, drs[0]["naturenm"].ToString());
natureid = drs[0]["parentid"].ToString();if(natureid.Trim().Length > 0)
{
++level;
GetNatureValsByID(natureid, ref level, natureDict);
}
}}
五、总结（整体代码概览）
public class NatureData
{
private DataTable dtNature = new DataTable();
private DataTable dtResult = new DataTable();
public NatureData()
{}
public DataTable GetNatureTable()
{
try
{
if (dtNature != null && dtNature.Rows.Count == 0)
{
dtNature = GetNatureData();
}dtResult = DeclareNatureTable(); // 声明表的结构
foreach (DataRow dr in dtNature.Rows)
{
DataRow drn = dtResult.NewRow();
string natureid = dr["natureid"].ToString();
drn["natureid"] = natureid;
int level = 0;
GetLevelByNatureID(natureid, ref level);
int leve11 = 0;
Dictionary<int, string> natureDict = new Dictionary<int, string>();
GetNatureValsByID(natureid, ref leve11,natureDict);
foreach (KeyValuePair<int, string> keyNature in natureDict)
{
string colName = "nature" + (level - keyNature.Key).ToString();
drn[colName] = keyNature.Value;
}
dtResult.Rows.Add(drn);
}
}
catch (Exception ex)
{
MessageBox.Show("查询数据失败:" + ex.Message);
}
return dtResult;
}/// <summary>
/// 依据Natureid 获得相应的所有级类目信息
/// </summary>
/// <param name="natureid"></param>
/// <param name="level"></param>
/// <param name="natureDict"></param>
public void GetNatureValsByID(string natureid, ref int level,Dictionary<int, string> natureDict)
{
if (dtNature != null && dtNature.Rows.Count == 0)
{
dtNature = GetNatureData();
}if (dtNature != null && dtNature.Rows.Count > 0)
{
DataRow[] drs = dtNature.Select(string.Format("natureid=‘{0}‘", natureid));
natureDict.Add(level, drs[0]["naturenm"].ToString());
natureid = drs[0]["parentid"].ToString();if(natureid.Trim().Length > 0)
{
++level;
GetNatureValsByID(natureid, ref level, natureDict);
}
}}
public void GetLevelByNatureID(string natureid, ref int level)
{
if (dtNature == null || dtNature.Rows.Count == 0)
{
dtNature = GetNatureData();
}if (dtNature.Rows.Count > 0)
{
DataRow[] drs = dtNature.Select(string.Format("natureid=‘{0}‘", natureid));
if (drs.Count() > 0)
{
level++;
string parentid = drs[0]["parentid"].ToString();
DataRow[] drst = dtNature.Select(string.Format("natureid=‘{0}‘", parentid));
if (drst.Length > 0)
{
GetLevelByNatureID(parentid, ref level);
}
}
}
}/// <summary>
/// 获得Nature定义的最大目录级别，以便于确定Nature的DataTable表结构中的列数目
/// </summary>
/// <returns></returns>
public int GetMaxNatureLevel()
{
if (dtNature == null && dtNature.Rows.Count == 0)
{
dtNature = GetNatureData();
}int maxLevel = 0;
foreach (DataRow dr in dtNature.Rows)
{
int currentLevel = 0;
GetLevelByNatureID(dr["natureid"].ToString(), ref currentLevel);
if (currentLevel > maxLevel)
{
maxLevel = currentLevel;
}
}
return maxLevel;
}/// <summary>
/// 依据Nature目录的最大级别，声明表的存储结构
/// </summary>
/// <returns></returns>
public DataTable DeclareNatureTable()
{
DataTable dt = new DataTable();
if (dtNature == null && dtNature.Rows.Count == 0)
{
dtNature = GetNatureData();
}
dt.Columns.Add("natureid");int MaxLevel = GetMaxNatureLevel();
for (int i = 1; i <= MaxLevel; i++)
{
dt.Columns.Add("nature" + i.ToString());
}
return dt;
}/// <summary>
/// 获得数据库中Nature的所有信息
/// </summary>
/// <returns></returns>
public DataTable GetNatureData()
{
DataTable dt = new DataTable();
try
{
string sQuery = string.Format(" SELECT natureid,naturenm,parentid,seqnumbr FROM dbo.CRNATUREM0 WHERE dsblflag =0 ORDER BY seqnumbr ");
Database db = DatabaseFactory.CreateDatabase();
DataSet ds = db.ExecuteDataSet(CommandType.Text, sQuery);if (ds != null)
{
dt = ds.Tables[0];
}
}
catch (Exception ex)
{
MessageBox.Show("查询数据失败:" + ex.Message);
}
return dt;
}}
六、运行效果；如下图
数据结构：
CREATE TABLE [dbo].[CRNATUREM0](
[natureid] [nvarchar](10) NOT NULL,
[naturenm] [nvarchar](100) NULL,
[parentid] [nvarchar](10) NULL,
[seqnumbr] [int] NULL,
[dsblflag] [bit] NULL,
[lstupdby] [nvarchar](30) NULL,
[lstupddt] [datetime] NULL,
[natext] [text] NULL,
CONSTRAINT [PK_CRNATUREM0] PRIMARY KEY CLUSTERED
(
[natureid] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
附源代码：下载
菜单数据（树形）结构的使用-- ---数据的列存储转换为行存储,码迷,mamicode.com