maddish
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发表于:2008-2-29 12:09
标题：通过 数据库表 自动生成 实体类
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// 获取到所有的用户表.
DataTable userTableName = GetTable( "select name as tablename from sysobjects where xtype = 'U'" );
//根据表名获取所有字段和字段类型
DataTable myTable =
GetTable(
"select syscolumns.name,systypes.name as type from syscolumns " +
" INNER JOIN sysobjects ON syscolumns.id = sysobjects.id " +
"INNER JOIN systypes ON syscolumns.xtype = systypes.xtype " +
" WHERE (sysobjects.name = '" + tableName + "') AND (systypes.name <> 'sysname') ");
//创建一个新的表.需要生成的数据
//字段1:修饰符 - 一般为 private
//字段2:修饰符2 - 一般我不写.可以写 statice
//字段3:SQL字段的类型 - 在生成.cs文件前会转换成c#类型
//字段4:生成属性名称 - 与表内字段名一样
DataTableNew.Columns.Add("xiushifu1", typeof (string));
DataTableNew.Columns.Add("xiushifu2", typeof (string));
DataTableNew.Columns.Add("type", typeof (string));
DataTableNew.Columns.Add("name", typeof (string));
// 进行类型转换
//为生成实体需要的数据添加记录保存
for (int i = 0; i < myTable.Rows.Count; i++)
{
string typeName = ChangeToCSharpType(myTable.Rows["type"].ToString());
DataTableNew.Rows.Add(new object[] {"private", "", typeName, myTable.Rows["name"]});
}
//进行类型转换函数
protected static string ChangeToCSharpType( string type )
{
string reval;
switch( type.ToLower() )
{
case "int":
reval = "Int32";
break;
case "text":
reval = "String";
break;
case "bigint":
reval = "Int64";
break;
case "binary":
reval = "System.Byte[]";
break;
case "bit":
reval = "Boolean";
break;
case "char":
reval = "String";
break;
case "datetime":
reval = "System.DateTime";
break;
case "decimal":
reval = "System.Decimal";
break;
case "float":
reval = "System.Double";
break;
case "image":
reval = "System.Byte[]";
break;
case "money":
reval = "System.Decimal";
break;
case "nchar":
reval = "String";
break;
case "ntext":
reval = "String";
break;
case "numeric":
reval = "System.Decimal";
break;
case "nvarchar":
reval = "String";
break;
case "real":
reval = "System.Single";
break;
case "smalldatetime":
reval = "System.DateTime";
break;
case "smallint":
reval = "Int16";
break;
case "smallmoney":
reval = "System.Decimal";
break;
case "timestamp":
reval = "System.DateTime";
break;
case "tinyint":
reval = "System.Byte";
break;
case "uniqueidentifier":
reval = "System.Guid";
break;
case "varbinary":
reval = "System.Byte[]";
break;
case "varchar":
reval = "String";
break;
case "Variant":
reval = "Object";
break;
default:
reval = "String";
break;
}
return reval;
}
//创建文本流并设置编码
TextWriter writer = new StreamWriter(
new BufferedStream(
new FileStream( fileDesc , FileMode.Create , FileAccess.Write ) ) , System.Text.Encoding.GetEncoding( "gb2312" ) )
// 写入命名空间和类名
writer.WriteLine( "using System;" );
writer.WriteLine();
writer.WriteLine( "namespace " + nameSpace );
writer.WriteLine( "{" );
writer.WriteLine( "\tpublic class " + className );
writer.WriteLine( "\t{" );
//写入所有私有变量
for( int i = 0 ; i < table.Rows.Count ; i++ )
{
object [ ] row = table.Rows [ i ].ItemArray;
writer.Write( "\t\t" );
for( int j = 0 ; j < row.Length ; j++ )
{
writer.Write( row [ j ].Equals( "无" ) ? "" : row [ j ] + ( j == row.Length - 1 ? "" : " " ) );
}
writer.Write( ";" );
writer.WriteLine();
}
//写入所有属性
for( int i = 0 ; i < table.Rows.Count ; i++ )
{
writer.Write( "\t\t" );
writer.Write( "public " );
object [ ] row = table.Rows [ i ].ItemArray;
for( int j = 1 ; j < row.Length - 1 ; j++ )
{
if( row [ j ].Equals( "static" ) )
{
writer.Write( "static " );
continue;
}
writer.Write( row [ j ].Equals( "无" ) ? "" : row [ j ] + " " );
}
string attribName = row [ row.Length - 1 ].ToString();
writer.Write( attribName.Substring( 0 , 1 ).ToUpper() + attribName.Substring( 1 , attribName.Length - 1 ) );
writer.WriteLine();
writer.WriteLine( "\t\t{" );
writer.WriteLine( "\t\t\tget" );
writer.WriteLine( "\t\t\t{" );
if( row [ 1 ].Equals( "static" ) )
{
writer.WriteLine( "\t\t\t\treturn " + attribName + ";" );
}
else
{
writer.WriteLine( "\t\t\t\treturn this." + attribName + ";" );
}
writer.WriteLine( "\t\t\t}" );
writer.WriteLine( "\t\t\tset" );
writer.WriteLine( "\t\t\t{" );
if( row [ 1 ].Equals( "static" ) )
{
writer.WriteLine( "\t\t\t\t" + attribName + " = value;" );
}
else
{
writer.WriteLine( "\t\t\t\tthis." + attribName + "= value;" );
}
writer.WriteLine( "\t\t\t}" );
writer.WriteLine( "\t\t}" );
}
writer.WriteLine( "\t}" );
writer.WriteLine( "}" );
完整项目代码可下载....
共享下....
还是可以提高开发效率的.
// 获取到所有的用户表.
 DataTable userTableName = GetTable( "select name as tablename from sysobjects where xtype = 'U'" );
//根据表名获取所有字段和字段类型
DataTable myTable =
GetTable(
"select syscolumns.name,systypes.name as type from syscolumns " +
" INNER JOIN sysobjects ON syscolumns.id = sysobjects.id " +
"INNER JOIN systypes ON syscolumns.xtype = systypes.xtype " +
" WHERE (sysobjects.name = '" + tableName + "') AND (systypes.name 'sysname') ");
//创建一个新的表.需要生成的数据
//字段1:修饰符 - 一般为 private
//字段2:修饰符2 - 一般我不写.可以写 statice
//字段3:SQL字段的类型 - 在生成.cs文件前会转换成c#类型
//字段4:生成属性名称 - 与表内字段名一样
DataTableNew.Columns.Add("xiushifu1", typeof (string));
DataTableNew.Columns.Add("xiushifu2", typeof (string));
DataTableNew.Columns.Add("type", typeof (string));
DataTableNew.Columns.Add("name", typeof (string));
// 进行类型转换
//为生成实体需要的数据添加记录保存
for (int i = 0; i
//进行类型转换函数
protected static string ChangeToCSharpType( string type )
{
string reval;
switch( type.ToLower() )
{
case "int":
reval = "Int32";
break;
case "text":
reval = "String";
break;
case "bigint":
reval = "Int64";
break;
case "binary":
reval = "System.Byte[]";
break;
case "bit":
reval = "Boolean";
break;
case "char":
reval = "String";
break;
case "datetime":
reval = "System.DateTime";
break;
case "decimal":
reval = "System.Decimal";
break;
case "float":
reval = "System.Double";
break;
case "image":
reval = "System.Byte[]";
break;
case "money":
reval = "System.Decimal";
break;
case "nchar":
reval = "String";
break;
case "ntext":
reval = "String";
break;
case "numeric":
reval = "System.Decimal";
break;
case "nvarchar":
reval = "String";
break;
case "real":
reval = "System.Single";
break;
case "smalldatetime":
reval = "System.DateTime";
break;
case "smallint":
reval = "Int16";
break;
case "smallmoney":
reval = "System.Decimal";
break;
case "timestamp":
reval = "System.DateTime";
break;
case "tinyint":
reval = "System.Byte";
break;
case "uniqueidentifier":
reval = "System.Guid";
break;
case "varbinary":
reval = "System.Byte[]";
break;
case "varchar":
reval = "String";
break;
case "Variant":
reval = "Object";
break;
default:
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