C#拼接SQL语句用ROW_NUMBER实现的高效分页排序

///

/// 单表（视图）获取分页SQL语句
///

/// 表名或视图名
/// 唯一键
/// 获取的字段
/// 查询条件（不包含WHERE）
/// 排序规则（不包含ORDER BY）
/// 页大小
/// 页码（从1开始）
/// 分页SQL语句
public static string GetPagingSQL(
string tableName,
string key,
string fields,
string condition,
string collatingSequence,
int pageSize,
int pageIndex)
{
string whereClause = string.Empty;
if (!string.IsNullOrEmpty(condition))
{
whereClause = string.Format("WHERE {0}", condition);
}

if (string.IsNullOrEmpty(collatingSequence))
{
collatingSequence = string.Format("{0} ASC", key);
}

StringBuilder sbSql = new StringBuilder();

sbSql.AppendFormat("SELECT {0} ", PrependTableName(tableName, fields, ','));
sbSql.AppendFormat("FROM ( SELECT TOP {0} ", pageSize * pageIndex);
sbSql.AppendFormat(" [_RowNum_] = ROW_NUMBER() OVER ( ORDER BY {0} ), ", collatingSequence);
sbSql.AppendFormat(" {0} ", key);
sbSql.AppendFormat(" FROM {0} ", tableName);
sbSql.AppendFormat(" {0} ", whereClause);
sbSql.AppendFormat(" ) AS [_TempTable_] ");
sbSql.AppendFormat(" INNER JOIN {0} ON [_TempTable_].{1} = {0}.{1} ", tableName, key);
sbSql.AppendFormat("WHERE [_RowNum_] > {0} ", pageSize * (pageIndex - 1));
sbSql.AppendFormat("ORDER BY [_TempTable_].[_RowNum_] ASC ");

return sbSql.ToString();
}

///

/// 给字段添加表名前缀
///

/// 表名
/// 字段
/// 标识字段间的分隔符
///
public static string PrependTableName(string tableName, string fields, char separator)
{
StringBuilder sbFields = new StringBuilder();

string[] fieldArr = fields.Trim(separator).Split(separator);
foreach (string str in fieldArr)
{
sbFields.AppendFormat("{0}.{1}{2}", tableName, str.Trim(), separator);
}

return sbFields.ToString().TrimEnd(separator);
}

CREATE TABLE [dbo].[Tbl_Product]
(
[ID] [int] IDENTITY(1, 1)
NOT NULL ,
[ProductId] [varchar](50) NOT NULL ,
[ProductName] [nvarchar](50) NOT NULL ,
[IsDeleted] [int] NOT NULL
CONSTRAINT [DF_Tbl_Product_IsDeleted] DEFAULT ( (0) ) ,
CONSTRAINT [PK_Tbl_Product] PRIMARY KEY CLUSTERED ( [ProductId] ASC )
WITH ( PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF,
IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON,
ALLOW_PAGE_LOCKS = ON ) ON [PRIMARY]
)
ON [PRIMARY]

SELECT Tbl_Product.ID ,
Tbl_Product.ProductId ,
Tbl_Product.ProductName
FROM ( SELECT TOP 25
[_RowNum_] = ROW_NUMBER() OVER ( ORDER BY ProductName ASC, ID DESC ) ,
ID
FROM Tbl_Product
WHERE IsDeleted = 0
) AS [_TempTable_]
INNER JOIN Tbl_Product ON [_TempTable_].ID = Tbl_Product.ID
WHERE [_RowNum_] > 20
ORDER BY [_TempTable_].[_RowNum_] ASC