• SQLServer数据库中的列对象 荣


    基于http://www.cnblogs.com/admin11/archive/2007/09/01/878298.html 和 http://www.cnblogs.com/admin11/archive/2007/09/05/882898.html 中对数据库系统数据的读取,我们可以建立列对象。
    我的列对象结构:

    using System;
    using System.Data;
    using System.Configuration;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Web.UI.HtmlControls;

    /// <summary>
    /// 数据库列信息类。
    /// </summary>
    /// <author>天志</author>
    /// <log date="2007-09-01">创建</log>
    public class ColumnDT
    {
        
    public ColumnDT()
        {
        }

        
    public ColumnDT(DataRowView dv)
        {
            
    this._tableName = Convert.ToString(dv["tableName"]);
            
    this._id = Convert.ToInt32(dv["id"]);
            
    this._columnName = Convert.ToString(dv["columnName"]);
            
    this._colId = Convert.ToInt32(dv["colId"]);
            
    this._columnType = Convert.ToString(dv["columnType"]);
            
    this._columnTypeIndex = Convert.ToInt32(dv["columnTypeIndex"]);
            
    this._length = Convert.ToInt32(dv["length"]);
            
    this._decimaldigits = Convert.ToInt32(dv["decimaldigits"]);
            
    this._script = Convert.ToString(dv["script"]);
            
    this._defaultValue = Convert.ToString(dv["defaultValue"]);
            
    this._isnullable = Convert.ToInt32(dv["isnullable"]);
            
    this._isMarking = Convert.ToInt32(dv["isMarking"]);
        }

        
    /// <summary>
        
    /// 所属表名称
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        private string _tableName;

        
    /// <summary>
        
    /// 所属表ID
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        private int _id;

        
    /// <summary>
        
    /// 列名
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        private string _columnName;

        
    /// <summary>
        
    /// 列ID
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        private int _colId;

        
    /// <summary>
        
    /// 数据类型
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        private string _columnType;

        
    /// <summary>
        
    /// 数据类型索引
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        private int _columnTypeIndex;

        
    /// <summary>
        
    /// 字段长度
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        private int _length;

        
    /// <summary>
        
    /// 小数点位数
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        private int _decimaldigits;

        
    /// <summary>
        
    /// 描述信息
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        private string _script;

        
    /// <summary>
        
    /// 默认值
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        private string _defaultValue;

        
    /// <summary>
        
    /// 是否允许为空
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        private int _isnullable;

        
    /// <summary>
        
    /// 是否标识
        
    /// </summary>
        private int _isMarking;

        
    /// <summary>
        
    /// 所属表名称
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        public string TableName
        {
            
    set
            {
                
    this._tableName = value;
            }
            
    get
            {
                
    return this._tableName;
            }
        }

        
    /// <summary>
        
    /// 所属表ID
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        public int Id
        {
            
    set
            {
                
    this._id = value;
            }
            
    get
            {
                
    return this._id;
            }
        }

        
    /// <summary>
        
    /// 列名
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        public string ColumnName
        {
            
    set
            {
                
    this._columnName = value;
            }
            
    get
            {
                
    return this._columnName;
            }
        }

        
    /// <summary>
        
    /// 列ID
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        public int ColId
        {
            
    set
            {
                
    this._colId = value;
            }
            
    get
            {
                
    return this._colId;
            }
        }

        
    /// <summary>
        
    /// 数据类型
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        public string ColumnType
        {
            
    set
            {
                
    this._columnType = value;
            }
            
    get
            {
                
    return this._columnType;
            }
        }

        
    /// <summary>
        
    /// 数据类型索引
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        public int ColumnTypeIndex
        {
            
    set
            {
                
    this._columnTypeIndex = value;
            }
            
    get
            {
                
    return this._columnTypeIndex;
            }
        }

        
    /// <summary>
        
    /// 字段长度
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        public int Length
        {
            
    set
            {
                
    this._length = value;
            }
            
    get
            {
                
    return this._length;
            }
        }

        
    /// <summary>
        
    /// 小数点位数
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        public int Decimaldigits
        {
            
    set
            {
                
    this._decimaldigits = value;
            }
            
    get
            {
                
    return this._decimaldigits;
            }
        }

        
    /// <summary>
        
    /// 描述信息
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        public string Script
        {
            
    set
            {
                
    this._script = value;
            }
            
    get
            {
                
    return this._script;
            }
        }

        
    /// <summary>
        
    /// 默认值
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        public string DefaultValue
        {
            
    set
            {
                
    this._defaultValue = value;
            }
            
    get
            {
                
    return this._defaultValue;
            }
        }

        
    /// <summary>
        
    /// 是否允许为空
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        public bool IsNullable
        {
            
    set
            {
                
    if (value)
                {
                    
    this._isnullable = 1;
                }
                
    else
                {
                    
    this._isnullable = 0;
                }
            }
            
    get
            {
                
    if (this._isnullable == 1)
                {
                    
    return true;
                }
                
    else
                {
                    
    return false;
                }
            }
        }

        
    /// <summary>
        
    /// 是否标识
        
    /// </summary>
        
    /// <author>天志</author>
        
    /// <log date="2007-09-01">创建</log>
        public bool IsMarking
        {
            
    set
            {
                
    if (value)
                {
                    
    this._isMarking = 1;
                }
                
    else
                {
                    
    this._isMarking = 0;
                }
            }
            
    get
            {
                
    if (this._isMarking == 1)
                {
                    
    return true;
                }
                
    else
                {
                    
    return false;
                }
            }
        }

        
    /// <summary>
        
    /// 是否主键
        
    /// </summary>
        public bool IsPK
        {
            
    get
            {
                
    return DataMarket.IsPKForColumn(this.TableName, this.ColumnName);
            }
        }
    }


    这个对象里面收集了一个列的所属表名称、所属表ID、列名、列ID、数据类型、数据类型索引、字段长度、小数点位数、描述信息、默认值、是否允许为空、是否标识(自增ID)、是否主键等信息。
    其他的信息好得到。
    是否主键信息有点困难,通过DataMarket.IsPKForColumn方法实现。DataMarket是一个类。提供数据操作静态方法的类。数据是从SQL-server数据库中取得的数据库信息。
    IsPKForColumn以通过调用列名、所属表名称为参数,通过调用存储过程sp_pkeys来判断当前表的主键中是否包含该列名来判断该列是否是主键。

    using System;
    using System.Data;
    using System.Configuration;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Web.UI.HtmlControls;
    using System.Collections.Generic;
    using System.Collections;

    /// <summary>
    /// 存储列信息的集合.
    /// </summary>
    /// <author>天志</author>
    /// <log date="2007-09-01">创建</log>
    public class ColumnList<T> : List<T> where T : ColumnDT
    {
        
    public ColumnList() : base()
        {
        }

        
    public ColumnList(IEnumerable<T> collection)
            : 
    base(collection)
        {
        }

        
    public ColumnList(int capacity)
            : 
    base(capacity)
        {
        }
    }
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  • 原文地址:https://www.cnblogs.com/admin11/p/896849.html
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