/// <summary>
/// 获取选择语句内容
/// </summary>
/// <param name="baseCommand">源选择语句</param>
/// <param name="orderReverse">是否反转排序</param>
/// <returns>选择语句内容</returns>
internal static String InternalGetPagerCommand(SelectCommand baseCommand, Boolean orderReverse)
{
SqlCommandBuilder sb = new SqlCommandBuilder(baseCommand.Database);
sb.AppendSelectPrefix();
if (baseCommand.PageSize > 0 && baseCommand.RecordStart > 0)//分页模式
{
/*
* SELECT * FROM
* (
* SELECT TOP 30 *, ROW_NUMBER() OVER(ORDER BY ID ASC) AS RN
* FROM TABLE_NAME
* ) AS T
* WHERE RN > 20
*/
sb.AppendSelectDistinct(baseCommand.UseDistinct).AppendAllColumnNames(baseCommand.UseDistinct, baseCommand.InternalGetQueryFieldList());
SqlCommandBuilder innerBuilder = new SqlCommandBuilder(baseCommand.Database);
innerBuilder.AppendSelectOrderBys(baseCommand.InternalGetOrderList(), false);
SelectCommand innerCommand = baseCommand.Database.InternalCreateSelectCommand(baseCommand, baseCommand.TableName);
innerCommand.InternalQuerys(baseCommand.QueryFields);
innerCommand.InternalQuerys(SqlQueryField.InternalCreateFromFunction(baseCommand, "ROW_NUMBER() OVER( " + innerBuilder.ToString() + ")", "RN"));
innerCommand.PageSize = baseCommand.RecordStart + baseCommand.PageSize;
innerCommand.InternalSetJoinList(baseCommand);
innerCommand.InternalSetWhereCondition(baseCommand);
innerCommand.InternalSetGroupByFieldList(baseCommand);
innerCommand.InternalSetHavingCondition(baseCommand);
sb.AppendSelectFrom(innerCommand.GetCommandText("T"), true);
sb.AppendWhere(baseCommand.ConditionBuilder.GreaterThanColumn("RN", baseCommand.RecordStart.ToString()));
}
else//正常模式
{
if (baseCommand.PageSize > 0)
{
sb.AppendSelectTop(baseCommand.PageSize);
}
sb.AppendSelectDistinct(baseCommand.UseDistinct).AppendAllColumnNames(baseCommand.UseDistinct, baseCommand.InternalGetQueryFieldList());
sb.AppendSelectFromAndJoins(baseCommand.TableName, baseCommand.IsFromSql, baseCommand.InternalGetJoinList());
sb.AppendWhere(baseCommand.WhereCondition);
sb.AppendSelectGroupBys(baseCommand.InternalGetGroupByFieldList());
sb.AppendHaving(baseCommand.InternalGetHavingCondition());
sb.AppendSelectOrderBys(baseCommand.InternalGetOrderList(), orderReverse);
}
return(sb.ToString());
}
/// <summary>
/// 获取选择语句内容
/// </summary>
/// <param name="baseCommand">源选择语句</param>
/// <param name="orderReverse">是否反转排序</param>
/// <returns>选择语句内容</returns>
internal static String InternalGetPagerCommand(SelectCommand baseCommand, Boolean orderReverse)
{
SqlCommandBuilder sb = new SqlCommandBuilder(baseCommand.Database);
sb.AppendSelectPrefix();
if (baseCommand.PageSize > 0 && baseCommand.RecordStart > 0)//分页模式
{
/*
SELECT * FROM
(
SELECT TOP 30 *, ROW_NUMBER() OVER(ORDER BY ID ASC) AS RN
FROM TABLE_NAME
) AS T
WHERE RN > 20
*/
sb.AppendSelectDistinct(baseCommand.UseDistinct).AppendAllColumnNames(baseCommand.QueryFields);
SqlCommandBuilder innerBuilder = new SqlCommandBuilder(baseCommand.Database);
innerBuilder.AppendSelectOrderBys(baseCommand.SqlOrders, false);
SelectCommand innerCommand = new SelectCommand(baseCommand.Database, baseCommand.TableName);
innerCommand.InternalQuerys(baseCommand.QueryFields.ToArray());
innerCommand.InternalQuerys(SqlQueryField.InternalCreateFromFunction(baseCommand, "ROW_NUMBER() OVER( " + innerBuilder.ToString() + ")", "RN"));
innerCommand.PageSize = baseCommand.RecordStart + baseCommand.PageSize;
innerCommand.SqlJoins = baseCommand.SqlJoins;
innerCommand.SqlWhere = baseCommand.SqlWhere;
innerCommand.GroupByColumns = baseCommand.GroupByColumns;
innerCommand.SqlHaving = baseCommand.SqlHaving;
sb.AppendSelectFrom(innerCommand.GetCommandText("T"), true);
sb.AppendWhere(SqlCondition.GreaterThanColumn(baseCommand, "RN", baseCommand.RecordStart.ToString()));
}
else//正常模式
{
if (baseCommand.PageSize > 0)
{
sb.AppendSelectTop(baseCommand.PageSize);
}
sb.AppendSelectDistinct(baseCommand.UseDistinct).AppendAllColumnNames(baseCommand.QueryFields);
sb.AppendSelectFromAndJoins(baseCommand.TableName, baseCommand.IsFromSql, baseCommand.SqlJoins);
sb.AppendWhere(baseCommand.SqlWhere);
sb.AppendSelectGroupBys(baseCommand.GroupByColumns);
sb.AppendHaving(baseCommand.SqlHaving);
sb.AppendSelectOrderBys(baseCommand.SqlOrders, orderReverse);
}
return sb.ToString();
}
/// <summary>
/// 获取选择语句内容
/// </summary>
/// <param name="cmd">选择语句类</param>
/// <param name="realPageIndex">实际页索引</param>
/// <param name="realPageCount">实际页数量</param>
/// <param name="orderReverse">是否反转排序</param>
/// <returns>选择语句内容</returns>
internal static String InternalGetSelectCommand(SelectCommand cmd, Int32 realPageIndex, Int32 realPageCount, Boolean orderReverse)
{
SqlCommandBuilder sb = new SqlCommandBuilder(cmd.DatabaseType);
sb.AppendSelectPrefix();
if (realPageIndex == 1)//第一页
{
if (cmd.PageSize > 0)
{
sb.AppendSelectTop(cmd.PageSize);
}
sb.AppendSelectDistinct(cmd.UseDistinct).AppendAllColumnNames(cmd.QueryFields);
sb.AppendSelectFromAndJoins(cmd.TableName, cmd.IsFromSql, cmd.SqlJoins);
sb.AppendWhere(cmd.SqlWhere);
sb.AppendSelectGroupBys(cmd.GroupByColumns);
sb.AppendHaving(cmd.SqlHaving);
sb.AppendSelectOrderBys(cmd.SqlOrders, orderReverse);
}
else if (realPageIndex == realPageCount)//最后一页
{
sb.AppendSelectDistinct(cmd.UseDistinct).AppendAllColumnNames(cmd.QueryFields);
SelectCommand innerCommand = new SelectCommand(cmd.Database, cmd.TableName);
innerCommand.QueryFields = cmd.QueryFields;
innerCommand.PageSize = cmd.RecordCount - cmd.PageSize * (realPageIndex - 1);
innerCommand.SqlJoins = cmd.SqlJoins;
innerCommand.SqlWhere = cmd.SqlWhere;
innerCommand.GroupByColumns = cmd.GroupByColumns;
innerCommand.SqlHaving = cmd.SqlHaving;
innerCommand.SqlOrders = cmd.SqlOrders;
sb.AppendSelectFrom(innerCommand.ToString("T", !orderReverse), true);
sb.AppendSelectOrderBys(cmd.SqlOrders, orderReverse);
}
else if (realPageIndex < (realPageCount / 2 + realPageCount % 2))//前1/2部分页
{
sb.AppendSelectDistinct(cmd.UseDistinct).AppendAllColumnNames(cmd.QueryFields);
SelectCommand innestCommand = new SelectCommand(cmd.Database, cmd.TableName);
innestCommand.QueryFields = cmd.QueryFields;
innestCommand.PageSize = cmd.PageSize * realPageIndex;
innestCommand.SqlJoins = cmd.SqlJoins;
innestCommand.SqlWhere = cmd.SqlWhere;
innestCommand.GroupByColumns = cmd.GroupByColumns;
innestCommand.SqlHaving = cmd.SqlHaving;
innestCommand.SqlOrders = cmd.SqlOrders;
SelectCommand innerCommand = new SelectCommand(cmd.Database, innestCommand, "T");
innerCommand.QueryFields = cmd.QueryFields;
innerCommand.PageSize = cmd.PageSize;
innerCommand.SqlOrders = cmd.SqlOrders;
sb.AppendSelectFrom(innerCommand.ToString("T", !orderReverse), true);
sb.AppendSelectOrderBys(cmd.SqlOrders, orderReverse);
}
else//后1/2部分页
{
sb.AppendSelectTop(cmd.PageSize);
sb.AppendSelectDistinct(cmd.UseDistinct).AppendAllColumnNames(cmd.QueryFields);
SelectCommand innerCommand = new SelectCommand(cmd.Database, cmd.TableName);
innerCommand.QueryFields = cmd.QueryFields;
innerCommand.PageSize = cmd.RecordCount - cmd.PageSize * (realPageIndex - 1);
innerCommand.SqlJoins = cmd.SqlJoins;
innerCommand.SqlWhere = cmd.SqlWhere;
innerCommand.GroupByColumns = cmd.GroupByColumns;
innerCommand.SqlHaving = cmd.SqlHaving;
innerCommand.SqlOrders = cmd.SqlOrders;
sb.AppendSelectFrom(innerCommand.ToString("T", !orderReverse), true);
sb.AppendSelectOrderBys(cmd.SqlOrders, orderReverse);
}
return(sb.ToString());
}
/// <summary>
/// 获取选择语句内容
/// </summary>
/// <param name="cmd">选择语句类</param>
/// <param name="realPageIndex">实际页索引</param>
/// <param name="realPageCount">实际页数量</param>
/// <param name="orderReverse">是否反转排序</param>
/// <returns>选择语句内容</returns>
internal static String InternalGetSelectCommand(SelectCommand cmd, Int32 realPageIndex, Int32 realPageCount, Boolean orderReverse)
{
SqlCommandBuilder sb = new SqlCommandBuilder(cmd.DatabaseType);
sb.AppendSelectPrefix();
if (realPageIndex == 1)//第一页
{
if (cmd.PageSize > 0)
{
sb.AppendSelectTop(cmd.PageSize);
}
sb.AppendSelectDistinct(cmd.UseDistinct).AppendAllColumnNames(cmd.QueryFields);
sb.AppendSelectFromAndJoins(cmd.TableName, cmd.IsFromSql, cmd.SqlJoins);
sb.AppendWhere(cmd.SqlWhere);
sb.AppendSelectGroupBys(cmd.GroupByColumns);
sb.AppendHaving(cmd.SqlHaving);
sb.AppendSelectOrderBys(cmd.SqlOrders, orderReverse);
}
else if (realPageIndex == realPageCount)//最后一页
{
sb.AppendSelectDistinct(cmd.UseDistinct).AppendAllColumnNames(cmd.QueryFields);
SelectCommand innerCommand = new SelectCommand(cmd.Database, cmd.TableName);
innerCommand.QueryFields = cmd.QueryFields;
innerCommand.PageSize = cmd.RecordCount - cmd.PageSize * (realPageIndex - 1);
innerCommand.SqlJoins = cmd.SqlJoins;
innerCommand.SqlWhere = cmd.SqlWhere;
innerCommand.GroupByColumns = cmd.GroupByColumns;
innerCommand.SqlHaving = cmd.SqlHaving;
innerCommand.SqlOrders = cmd.SqlOrders;
sb.AppendSelectFrom(innerCommand.ToString("T", !orderReverse), true);
sb.AppendSelectOrderBys(cmd.SqlOrders, orderReverse);
}
else if (realPageIndex < (realPageCount / 2 + realPageCount % 2))//前1/2部分页
{
sb.AppendSelectDistinct(cmd.UseDistinct).AppendAllColumnNames(cmd.QueryFields);
SelectCommand innestCommand = new SelectCommand(cmd.Database, cmd.TableName);
innestCommand.QueryFields = cmd.QueryFields;
innestCommand.PageSize = cmd.PageSize * realPageIndex;
innestCommand.SqlJoins = cmd.SqlJoins;
innestCommand.SqlWhere = cmd.SqlWhere;
innestCommand.GroupByColumns = cmd.GroupByColumns;
innestCommand.SqlHaving = cmd.SqlHaving;
innestCommand.SqlOrders = cmd.SqlOrders;
SelectCommand innerCommand = new SelectCommand(cmd.Database, innestCommand, "T");
innerCommand.QueryFields = cmd.QueryFields;
innerCommand.PageSize = cmd.PageSize;
innerCommand.SqlOrders = cmd.SqlOrders;
sb.AppendSelectFrom(innerCommand.ToString("T", !orderReverse), true);
sb.AppendSelectOrderBys(cmd.SqlOrders, orderReverse);
}
else//后1/2部分页
{
sb.AppendSelectTop(cmd.PageSize);
sb.AppendSelectDistinct(cmd.UseDistinct).AppendAllColumnNames(cmd.QueryFields);
SelectCommand innerCommand = new SelectCommand(cmd.Database, cmd.TableName);
innerCommand.QueryFields = cmd.QueryFields;
innerCommand.PageSize = cmd.RecordCount - cmd.PageSize * (realPageIndex - 1);
innerCommand.SqlJoins = cmd.SqlJoins;
innerCommand.SqlWhere = cmd.SqlWhere;
innerCommand.GroupByColumns = cmd.GroupByColumns;
innerCommand.SqlHaving = cmd.SqlHaving;
innerCommand.SqlOrders = cmd.SqlOrders;
sb.AppendSelectFrom(innerCommand.ToString("T", !orderReverse), true);
sb.AppendSelectOrderBys(cmd.SqlOrders, orderReverse);
}
return sb.ToString();
}
/// <summary>
/// 获取选择语句内容
/// </summary>
/// <param name="baseCommand">源选择语句</param>
/// <param name="recordCount">记录数量</param>
/// <param name="orderReverse">是否反转排序</param>
/// <returns>选择语句内容</returns>
internal static String InternalGetPagerCommand(SelectCommand baseCommand, Int32 recordCount, Boolean orderReverse)
{
SqlCommandBuilder sb = new SqlCommandBuilder(baseCommand.Database);
sb.AppendSelectPrefix();
if (baseCommand.PageSize > 0 && baseCommand.RecordStart > 0)//分页模式
{
Int32 realPageCount = (recordCount + baseCommand.PageSize - 1) / baseCommand.PageSize;
Int32 realPageIndex = (baseCommand.RecordStart / baseCommand.PageSize) + 1;
if (realPageIndex >= realPageCount)//最后一页
{
sb.AppendSelectDistinct(baseCommand.UseDistinct).AppendAllColumnNames(baseCommand.QueryFields);
SelectCommand innerCommand = new SelectCommand(baseCommand.Database, baseCommand.TableName);
innerCommand.QueryFields = baseCommand.QueryFields;
innerCommand.PageSize = recordCount - baseCommand.RecordStart;
innerCommand.SqlJoins = baseCommand.SqlJoins;
innerCommand.SqlWhere = baseCommand.SqlWhere;
innerCommand.GroupByColumns = baseCommand.GroupByColumns;
innerCommand.SqlHaving = baseCommand.SqlHaving;
innerCommand.SqlOrders = baseCommand.SqlOrders;
sb.AppendSelectFrom(innerCommand.GetCommandText("T", !orderReverse), true);
sb.AppendSelectOrderBys(baseCommand.SqlOrders, orderReverse);
}
else if (realPageIndex < (realPageCount / 2 + realPageCount % 2))//前1/2部分页
{
/*
SELECT * FROM
(
SELECT TOP 10 * FROM
(
SELECT TOP 30 *
FROM TABLE_NAME
ORDER BY ID ASC
) AS T1
ORDER BY ID DESC
) AS T2
ORDER BY ID ASC
*/
sb.AppendSelectDistinct(baseCommand.UseDistinct).AppendAllColumnNames(baseCommand.QueryFields);
SelectCommand innestCommand = new SelectCommand(baseCommand.Database, baseCommand.TableName);
innestCommand.QueryFields = baseCommand.QueryFields;
innestCommand.PageSize = baseCommand.RecordStart + baseCommand.PageSize;
innestCommand.SqlJoins = baseCommand.SqlJoins;
innestCommand.SqlWhere = baseCommand.SqlWhere;
innestCommand.GroupByColumns = baseCommand.GroupByColumns;
innestCommand.SqlHaving = baseCommand.SqlHaving;
innestCommand.SqlOrders = baseCommand.SqlOrders;
SelectCommand innerCommand = new SelectCommand(baseCommand.Database, innestCommand, "T1");
innerCommand.QueryFields = baseCommand.QueryFields;
innerCommand.PageSize = baseCommand.PageSize;
innerCommand.SqlOrders = baseCommand.SqlOrders;
sb.AppendSelectFrom(innerCommand.GetCommandText("T2", !orderReverse), true);
sb.AppendSelectOrderBys(baseCommand.SqlOrders, orderReverse);
}
else//后1/2部分页
{
sb.AppendSelectTop(baseCommand.PageSize);
sb.AppendSelectDistinct(baseCommand.UseDistinct).AppendAllColumnNames(baseCommand.QueryFields);
SelectCommand innerCommand = new SelectCommand(baseCommand.Database, baseCommand.TableName);
innerCommand.QueryFields = baseCommand.QueryFields;
innerCommand.PageSize = recordCount - baseCommand.RecordStart;
innerCommand.SqlJoins = baseCommand.SqlJoins;
innerCommand.SqlWhere = baseCommand.SqlWhere;
innerCommand.GroupByColumns = baseCommand.GroupByColumns;
innerCommand.SqlHaving = baseCommand.SqlHaving;
innerCommand.SqlOrders = baseCommand.SqlOrders;
sb.AppendSelectFrom(innerCommand.GetCommandText("T", !orderReverse), true);
sb.AppendSelectOrderBys(baseCommand.SqlOrders, orderReverse);
}
}
else//正常模式
{
if (baseCommand.PageSize > 0)
{
sb.AppendSelectTop(baseCommand.PageSize);
}
sb.AppendSelectDistinct(baseCommand.UseDistinct).AppendAllColumnNames(baseCommand.QueryFields);
sb.AppendSelectFromAndJoins(baseCommand.TableName, baseCommand.IsFromSql, baseCommand.SqlJoins);
sb.AppendWhere(baseCommand.SqlWhere);
sb.AppendSelectGroupBys(baseCommand.GroupByColumns);
sb.AppendHaving(baseCommand.SqlHaving);
sb.AppendSelectOrderBys(baseCommand.SqlOrders, orderReverse);
}
return sb.ToString();
}
/// <summary>
/// 获取选择语句内容
/// </summary>
/// <param name="baseCommand">源选择语句</param>
/// <param name="recordCount">记录数量</param>
/// <param name="orderReverse">是否反转排序</param>
/// <returns>选择语句内容</returns>
internal static String InternalGetPagerCommand(SelectCommand baseCommand, Int32 recordCount, Boolean orderReverse)
{
SqlCommandBuilder sb = new SqlCommandBuilder(baseCommand.Database);
sb.AppendSelectPrefix();
if (baseCommand.PageSize > 0 && baseCommand.RecordStart > 0)//分页模式
{
Int32 realPageCount = (recordCount + baseCommand.PageSize - 1) / baseCommand.PageSize;
Int32 realPageIndex = (baseCommand.RecordStart / baseCommand.PageSize) + 1;
if (realPageIndex >= realPageCount)//最后一页
{
sb.AppendSelectDistinct(baseCommand.UseDistinct).AppendAllColumnNames(baseCommand.UseDistinct, baseCommand.InternalGetQueryFieldList());
SelectCommand innerCommand = baseCommand.Database.InternalCreateSelectCommand(baseCommand, baseCommand.TableName);
innerCommand.PageSize = recordCount - baseCommand.RecordStart;
innerCommand.InternalSetQueryFieldList(baseCommand);
innerCommand.InternalSetJoinList(baseCommand);
innerCommand.InternalSetWhereCondition(baseCommand);
innerCommand.InternalSetGroupByFieldList(baseCommand);
innerCommand.InternalSetHavingCondition(baseCommand);
innerCommand.InternalSetOrderList(baseCommand);
sb.AppendSelectFrom(innerCommand.GetCommandText("T", !orderReverse), true);
sb.AppendSelectOrderBys(baseCommand.InternalGetOrderList(), orderReverse);
}
else if (realPageIndex < (realPageCount / 2 + realPageCount % 2))//前1/2部分页
{
/*
* SELECT * FROM
* (
* SELECT TOP 10 * FROM
* (
* SELECT TOP 30 *
* FROM TABLE_NAME
* ORDER BY ID ASC
* ) AS T1
* ORDER BY ID DESC
* ) AS T2
* ORDER BY ID ASC
*/
sb.AppendSelectDistinct(baseCommand.UseDistinct).AppendAllColumnNames(baseCommand.UseDistinct, baseCommand.InternalGetQueryFieldList());
SelectCommand innestCommand = baseCommand.Database.InternalCreateSelectCommand(baseCommand, baseCommand.TableName);
innestCommand.PageSize = baseCommand.RecordStart + baseCommand.PageSize;
innestCommand.InternalSetQueryFieldList(baseCommand);
innestCommand.InternalSetJoinList(baseCommand);
innestCommand.InternalSetWhereCondition(baseCommand);
innestCommand.InternalSetGroupByFieldList(baseCommand);
innestCommand.InternalSetHavingCondition(baseCommand);
innestCommand.InternalSetOrderList(baseCommand);
SelectCommand innerCommand = baseCommand.Database.InternalCreateSelectCommand(baseCommand, innestCommand, "T1");
innerCommand.PageSize = baseCommand.PageSize;
innerCommand.InternalSetQueryFieldList(baseCommand);
innerCommand.InternalSetOrderList(baseCommand);
sb.AppendSelectFrom(innerCommand.GetCommandText("T2", !orderReverse), true);
sb.AppendSelectOrderBys(baseCommand.InternalGetOrderList(), orderReverse);
}
else//后1/2部分页
{
sb.AppendSelectTop(baseCommand.PageSize);
sb.AppendSelectDistinct(baseCommand.UseDistinct).AppendAllColumnNames(baseCommand.UseDistinct, baseCommand.InternalGetQueryFieldList());
SelectCommand innerCommand = baseCommand.Database.InternalCreateSelectCommand(baseCommand, baseCommand.TableName);
innerCommand.PageSize = recordCount - baseCommand.RecordStart;
innerCommand.InternalSetQueryFieldList(baseCommand);
innerCommand.InternalSetJoinList(baseCommand);
innerCommand.InternalSetWhereCondition(baseCommand);
innerCommand.InternalSetGroupByFieldList(baseCommand);
innerCommand.InternalSetHavingCondition(baseCommand);
innerCommand.InternalSetOrderList(baseCommand);
sb.AppendSelectFrom(innerCommand.GetCommandText("T", !orderReverse), true);
sb.AppendSelectOrderBys(baseCommand.InternalGetOrderList(), orderReverse);
}
}
else//正常模式
{
if (baseCommand.PageSize > 0)
{
sb.AppendSelectTop(baseCommand.PageSize);
}
sb.AppendSelectDistinct(baseCommand.UseDistinct).AppendAllColumnNames(baseCommand.UseDistinct, baseCommand.InternalGetQueryFieldList());
sb.AppendSelectFromAndJoins(baseCommand.TableName, baseCommand.IsFromSql, baseCommand.InternalGetJoinList());
sb.AppendWhere(baseCommand.WhereCondition);
sb.AppendSelectGroupBys(baseCommand.InternalGetGroupByFieldList());
sb.AppendHaving(baseCommand.InternalGetHavingCondition());
sb.AppendSelectOrderBys(baseCommand.InternalGetOrderList(), orderReverse);
}
return(sb.ToString());
}