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add sqlserver2012+ offset fetch next

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28810 2019-02-21 14:30:51 +08:00
parent ae347d4b04
commit be84f6dbd6
1 changed files with 78 additions and 1 deletions
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79
FreeSql/SqlServer/Curd/SqlServerSelect.cs
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@ -10,7 +10,11 @@ namespace FreeSql.SqlServer.Curd {
class SqlServerSelect<T1> : FreeSql.Internal.CommonProvider.Select1Provider<T1> where T1 : class { class SqlServerSelect<T1> : FreeSql.Internal.CommonProvider.Select1Provider<T1> where T1 : class {
internal static string ToSqlStatic(CommonUtils _commonUtils, string _select, string field, StringBuilder _join, StringBuilder _where, string _groupby, string _having, string _orderby, int _skip, int _limit, List<SelectTableInfo> _tables, IFreeSql _orm) { internal static string ToSqlStatic(CommonUtils _commonUtils, string _select, string field, StringBuilder _join, StringBuilder _where, string _groupby, string _having, string _orderby, int _skip, int _limit, List<SelectTableInfo> _tables, IFreeSql _orm)
=> ToSqlStaticRowNumber(_commonUtils, _select, field, _join, _where, _groupby, _having, _orderby, _skip, _limit, _tables, _orm);
#region SqlServer 2005 row_number
internal static string ToSqlStaticRowNumber(CommonUtils _commonUtils, string _select, string field, StringBuilder _join, StringBuilder _where, string _groupby, string _having, string _orderby, int _skip, int _limit, List<SelectTableInfo> _tables, IFreeSql _orm) {
if (_orm.CodeFirst.IsAutoSyncStructure) if (_orm.CodeFirst.IsAutoSyncStructure)
_orm.CodeFirst.SyncStructure(_tables.Select(a => a.Table.Type).ToArray()); _orm.CodeFirst.SyncStructure(_tables.Select(a => a.Table.Type).ToArray());
@ -80,6 +84,79 @@ namespace FreeSql.SqlServer.Curd {
return sb.ToString(); return sb.ToString();
} }
#endregion
#region SqlServer 2012+ offset feach next
internal static string ToSqlStaticOffsetFetchNext(CommonUtils _commonUtils, string _select, string field, StringBuilder _join, StringBuilder _where, string _groupby, string _having, string _orderby, int _skip, int _limit, List<SelectTableInfo> _tables, IFreeSql _orm) {
if (_orm.CodeFirst.IsAutoSyncStructure)
_orm.CodeFirst.SyncStructure(_tables.Select(a => a.Table.Type).ToArray());
var sb = new StringBuilder();
sb.Append(_select);
if (_skip <= 0 && _limit > 0) sb.Append("TOP ").Append(_limit).Append(" ");
sb.Append(field);
sb.Append(" \r\nFROM ");
var tbsjoin = _tables.Where(a => a.Type != SelectTableInfoType.From).ToArray();
var tbsfrom = _tables.Where(a => a.Type == SelectTableInfoType.From).ToArray();
for (var a = 0; a < tbsfrom.Length; a++) {
sb.Append(_commonUtils.QuoteSqlName(tbsfrom[a].Table.DbName)).Append(" ").Append(tbsfrom[a].Alias);
if (tbsjoin.Length > 0) {
//如果存在 join 查询，则处理 from t1, t2 改为 from t1 inner join t2 on 1 = 1
for (var b = 1; b < tbsfrom.Length; b++)
sb.Append(" \r\nLEFT JOIN ").Append(_commonUtils.QuoteSqlName(tbsfrom[b].Table.DbName)).Append(" ").Append(tbsfrom[b].Alias).Append(" ON 1 = 1");
break;
}
if (a < tbsfrom.Length - 1) sb.Append(", ");
}
foreach (var tb in tbsjoin) {
if (tb.Type == SelectTableInfoType.Parent) continue;
switch (tb.Type) {
case SelectTableInfoType.LeftJoin:
sb.Append(" \r\nLEFT JOIN ");
break;
case SelectTableInfoType.InnerJoin:
sb.Append(" \r\nINNER JOIN ");
break;
case SelectTableInfoType.RightJoin:
sb.Append(" \r\nRIGHT JOIN ");
break;
}
sb.Append(_commonUtils.QuoteSqlName(tb.Table.DbName)).Append(" ").Append(tb.Alias).Append(" ON ").Append(tb.On);
}
if (_join.Length > 0) sb.Append(_join);
var sbqf = new StringBuilder();
foreach (var tb in _tables) {
if (tb.Type == SelectTableInfoType.Parent) continue;
if (string.IsNullOrEmpty(tb.Table.SelectFilter) == false)
sbqf.Append(" AND (").Append(tb.Table.SelectFilter.Replace("a.", $"{tb.Alias}.")).Append(")");
}
if (_where.Length > 0) {
sb.Append(" \r\nWHERE ").Append(_where.ToString().Substring(5));
if (sbqf.Length > 0) sb.Append(sbqf.ToString());
} else {
if (sbqf.Length > 0) sb.Append(" \r\nWHERE ").Append(sbqf.Remove(0, 5));
}
if (string.IsNullOrEmpty(_groupby) == false) {
sb.Append(_groupby);
if (string.IsNullOrEmpty(_having) == false)
sb.Append(" \r\nHAVING ").Append(_having.Substring(5));
}
if (_skip > 0) {
if (string.IsNullOrEmpty(_orderby)) {
var pktb = _tables.Where(a => a.Table.Primarys.Any()).FirstOrDefault();
if (pktb != null) _orderby = string.Concat(" \r\nORDER BY ", pktb.Alias, ".", _commonUtils.QuoteSqlName(pktb?.Table.Primarys.First().Attribute.Name));
else _orderby = string.Concat(" \r\nORDER BY ", _tables.First().Alias, ".", _commonUtils.QuoteSqlName(_tables.First().Table.Columns.First().Value.Attribute.Name));
}
sb.Append(_orderby).Append($" \r\nOFFSET {_skip} ROW");
if (_limit > 0) sb.Append($" \r\nFETCH NEXT {_limit} ROW ONLY");
} else {
sb.Append(_orderby);
}
return sb.ToString();
}
#endregion
public SqlServerSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { } public SqlServerSelect(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere) : base(orm, commonUtils, commonExpression, dywhere) { }
public override ISelect<T1, T2, T3> From<T2, T3>(Expression<Func<ISelectFromExpression<T1>, T2, T3, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp?.Body); var ret = new SqlServerSelect<T1, T2, T3>(_orm, _commonUtils, _commonExpression, null); SqlServerSelect<T1>.CopyData(this, ret); return ret; } public override ISelect<T1, T2, T3> From<T2, T3>(Expression<Func<ISelectFromExpression<T1>, T2, T3, ISelectFromExpression<T1>>> exp) { this.InternalFrom(exp?.Body); var ret = new SqlServerSelect<T1, T2, T3>(_orm, _commonUtils, _commonExpression, null); SqlServerSelect<T1>.CopyData(this, ret); return ret; }