ACCESS数据库访问组件(二)

王朝other·作者佚名  2006-01-09
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ACCESS数据库访问组件(二)ACCESS_Table.cs

using System;

namespace XLang.VideoOnline.Framework.Database.Access

{

/// <summary>

/// Summary description for ACCESS_DataTable.

/// </summary>

public class DataTable:System.Data.DataTable

{

private string _tableName;

private string _primaryKey;

public string Name

{

get { return _tableName; }

set { _tableName=value; }

}

public string PrimaryKey

{

get { return _primaryKey; }

set { _primaryKey=value; }

}

public DataTable()

{

}

public DataTable(string tableName)

{

_tableName=tableName;

}

public string CreateCommand(Database.Access.DataRow[] rows)

{

string temp="CREATE TABLE "+_tableName+"(";

for(int i=0;i<rows.GetLength(0);i++)

{

temp+="["+rows[i].Name+"] "+rows[i].Type+(rows[i].IsNull? ",":" not null,");

}

temp+="CONSTRAINT [Index1] PRIMARY KEY (["+rows[0].Name+"]))";

_primaryKey=rows[0].Name;

return temp;

}

public string InsertCommand(Database.Access.DataRow[] rows)

{

string temp="";

temp="INSERT INTO "+_tableName+" ( ";

for(int i=0;i<rows.GetLength(0);i++)

{

temp+="["+rows[i].Name+"] "+",";

}

temp=temp.Substring(0,temp.Length-1);

temp+=") VALUES(";

for(int i=0;i<rows.GetLength(0);i++)

{

if(rows[i].Type.Equals("boolean"))

temp+=((rows[i].Value.ToString().ToUpper().Equals("YES"))? "yes":"no")+",";

else if(rows[i].Type.StartsWith("string")||rows[i].Type.Equals("memo")||

rows[i].Type.Equals("text")||rows[i].Type.StartsWith("text"))

temp+="'"+rows[i].Value+"',";

else if(rows[i].Type.Equals("date"))

temp+="#"+rows[i].Value+"#,";

else

temp+=rows[i].Value+",";

}

temp=temp.Substring(0,temp.Length-1);

temp+=")";

return temp;

}

public string DeleteCommand()

{

return "DROP TABLE "+_tableName;

}

public string DeleteCommand(string conditions)

{

return "DELETE * FROM "+_tableName+" WHERE "+conditions;

}

public string UpdateCommand(Database.Access.DataRow[] rows,string conditions)

{

string temp="UPDATE "+_tableName+" SET ";

temp+=ProsessDifferentDataType(rows);

temp+=" WHERE "+conditions;

return temp;

}

public string SelectCommand()

{

return "SELECT * FROM "+_tableName;

}

public string SelectCommand(string conditions)

{

return "SELECT * FROM "+_tableName +" WHERE "+conditions;

}

public string SelectCommand(Database.Access.DataRow[] rows,string conditions)

{

string temp="SELECT ";

for(int i=0;i<rows.GetLength(0);i++)

{

temp+="["+rows[i].Name+"],";

}

temp=temp.Substring(0,temp.Length-1);

temp+=" FROM "+_tableName+" WHERE "+conditions;

return temp;

}

public string JoinCommand(Database.Access.DataRow[] rows,string condition,params string [] tableNames)

{

string temp="SELECT ";

for(int i=0;i<rows.GetLength(0);i++)

{

temp+="["+rows[i].Name+"],";

}

temp=temp.Substring(0,temp.Length-1);

// temp+=" FROM "+_tableName+" WHERE "+conditions;

temp+=" FROM ";

foreach(string table in tableNames)

temp+=table+",";

temp=temp.Substring(0,temp.Length-1);

if(condition!=null)

temp+=" WHERE "+condition;

return temp;

}

private string ProsessDifferentDataType(Database.Access.DataRow[] rows)

{

string temp="";

for(int i=0;i<rows.GetLength(0);i++)

{

if(rows[i].Type.Equals("boolean"))

temp+="["+rows[i].Name+"] ="+

((rows[i].Value.ToString().ToUpper().Equals("YES"))? "yes":"no")

+",";

else if(rows[i].Type.StartsWith("string")||rows[i].Type.Equals("memo")||

rows[i].Type.Equals("text")||rows[i].Type.StartsWith("text"))

temp+="["+rows[i].Name+"] ='"+rows[i].Value+"',";

else if(rows[i].Type.Equals("date"))

temp+="["+rows[i].Name+"] =#"+rows[i].Value+"#,";

else

temp+="["+rows[i].Name+"] ="+rows[i].Value+",";

}

temp=temp.Substring(0,temp.Length-1);

return temp;

}

}

}

 
 
 
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