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- 增加 AsTable 多次，可查询分表后的多个子表记录，以 UNION ALL 形式执行；

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This commit is contained in:
28810
2019-09-09 18:30:55 +08:00
parent ebec260d97
commit bcc154ee43
13 changed files with 620 additions and 464 deletions
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9
FreeSql/FreeSql.xml
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@ -809,7 +809,14 @@
</member>
<member name="M:FreeSql.ISelect0`2.AsTable(System.Func{System.Type,System.String,System.String})">
<summary>
设置表名规则，可用于分库/分表，参数1：实体类型；参数2：默认表名；返回值：新表名；
设置表名规则，可用于分库/分表，参数1：实体类型；参数2：默认表名；返回值：新表名； <para></para>
设置后可查询分表后的多个子表记录，以 UNION ALL 形式执行。 <para></para>
如：select.AsTable((type, oldname) => "table_1").AsTable((type, oldname) => "table_2").AsTable((type, oldname) => "table_3").ToSql(a => a.Id); <para></para>
select * from (SELECT a."Id" as1 FROM "table_1" a) ftb <para></para>
UNION ALL<para></para>
select * from (SELECT a."Id" as1 FROM "table_2" a) ftb <para></para>
UNION ALL<para></para>
select * from (SELECT a."Id" as1 FROM "table_3" a) ftb
</summary>
<param name="tableRule"></param>
<returns></returns>

9
FreeSql/Interface/Curd/ISelect/ISelect0.cs
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@ -68,7 +68,14 @@ namespace FreeSql
Task<T1> FirstAsync();
/// <summary>
/// 设置表名规则，可用于分库/分表，参数1：实体类型；参数2：默认表名；返回值：新表名；
/// 设置表名规则，可用于分库/分表，参数1：实体类型；参数2：默认表名；返回值：新表名； <para></para>
/// 设置后可查询分表后的多个子表记录，以 UNION ALL 形式执行。 <para></para>
/// 如：select.AsTable((type, oldname) => "table_1").AsTable((type, oldname) => "table_2").AsTable((type, oldname) => "table_3").ToSql(a => a.Id); <para></para>
/// select * from (SELECT a."Id" as1 FROM "table_1" a) ftb <para></para>
/// UNION ALL<para></para>
/// select * from (SELECT a."Id" as1 FROM "table_2" a) ftb <para></para>
/// UNION ALL<para></para>
/// select * from (SELECT a."Id" as1 FROM "table_3" a) ftb
/// </summary>
/// <param name="tableRule"></param>
/// <returns></returns>

12
FreeSql/Internal/CommonProvider/SelectProvider/Select0Provider.cs
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@ -906,14 +906,16 @@ namespace FreeSql.Internal.CommonProvider
return (map, field.ToString());
}
protected string TableRuleInvoke(Type type, string oldname)
protected string[] TableRuleInvoke(Type type, string oldname)
{
for (var a = _tableRules.Count - 1; a >= 0; a--)
List<string> newnames = new List<string>();
foreach (var tr in _tableRules)
{
var newname = _tableRules[a]?.Invoke(type, oldname);
if (!string.IsNullOrEmpty(newname)) return newname;
var newname = tr?.Invoke(type, oldname);
if (!string.IsNullOrEmpty(newname)) newnames.Add(newname);
}
return oldname;
if (newnames.Any() == false) return new[] { oldname };
return newnames.Distinct().ToArray();
}
public TSelect AsTable(Func<Type, string, string> tableRule)

31
FreeSql/Internal/CommonUtils.cs
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@ -363,5 +363,36 @@ namespace FreeSql.Internal
}
while (initConns.TryTake(out var conn)) pool.Return(conn);
}
public static List<Dictionary<Type, string>> GetAllTableRule(List<SelectTableInfo> _tables, Func<Type, string, string[]> tableRuleInvoke)
{
var tableRuleSorted = new List<(Type, string[])>();
var tableRuleDict = new Dictionary<Type, bool>();
foreach(var tb in _tables)
{
if (tb.Type == SelectTableInfoType.Parent) continue;
if (tableRuleDict.ContainsKey(tb.Table.Type)) continue;
var names = tableRuleInvoke(tb.Table.Type, tb.Table.DbName);
tableRuleSorted.Add((tb.Table.Type, names));
tableRuleDict.Add(tb.Table.Type, true);
}
var tableRules = new List<Dictionary<Type, string>>();
tableRules.Add(tableRuleSorted.Select(a => (a.Item1, a.Item2.First())).ToDictionary(a => a.Item1, a => a.Item2));
for (var z = tableRuleSorted.Count - 1; z >=0; z--)
{
var tbrd = tableRuleSorted[z];
var curpos = tableRules.Count;
for (var a = 1; a < tbrd.Item2.Length; a++)
{
for (var b = 0; b < curpos; b++)
{
var tr = new Dictionary<Type, string>();
foreach (var oldtd in tableRules[b]) tr.Add(oldtd.Key, tbrd.Item1 == oldtd.Key ? tbrd.Item2[a] : oldtd.Value);
tableRules.Add(tr);
}
}
}
return tableRules;
}
}
}