- 修复 MySql 8.0 索引 DESC 的判断；#1664

Author: 2881099

Providers/FreeSql.Provider.Custom/MySql/CustomMySqlCodeFirst.cs

@@ -256,7 +256,7 @@ from information_schema.columns a
 select 
 a.column_name,
 a.index_name 'index_id',
-0 'IsDesc',
+case when a.collation = 'D' then 1 else 0 end 'IsDesc',
 case when a.non_unique = 0 then 1 else 0 end 'IsUnique'
 from information_schema.statistics a
 where a.table_schema IN ({0}) and a.table_name IN ({1}) and a.index_name <> 'PRIMARY'", tboldname ?? tbname);

Providers/FreeSql.Provider.Custom/MySql/CustomMySqlDbFirst.cs

@@ -299,7 +299,7 @@ from information_schema.columns a
 case when a.non_unique = 0 then 1 else 0 end 'IsUnique',
 case when a.index_name = 'PRIMARY' then 1 else 0 end 'IsPrimaryKey',
 0 'IsClustered',
-0 'IsDesc'
+case when a.collation = 'D' then 1 else 0 end 'IsDesc'
 from information_schema.statistics a
 where {(ignoreCase ? "lower(a.table_schema)" : "a.table_schema")} in ({databaseIn}) and {loc8}
 ";

Providers/FreeSql.Provider.MySql/MySqlCodeFirst.cs

@@ -267,7 +267,7 @@ from information_schema.columns a
 select 
 a.column_name,
 a.index_name 'index_id',
-0 'IsDesc',
+case when a.collation = 'D' then 1 else 0 end 'IsDesc',
 case when a.non_unique = 0 then 1 else 0 end 'IsUnique'
 from information_schema.statistics a
 where a.table_schema IN ({0}) and a.table_name IN ({1}) and a.index_name <> 'PRIMARY'", tboldname ?? tbname);

Providers/FreeSql.Provider.MySql/MySqlDbFirst.cs

@@ -332,7 +332,7 @@ from information_schema.columns a
 case when a.non_unique = 0 then 1 else 0 end 'IsUnique',
 case when a.index_name = 'PRIMARY' then 1 else 0 end 'IsPrimaryKey',
 0 'IsClustered',
-0 'IsDesc'
+case when a.collation = 'D' then 1 else 0 end 'IsDesc'
 from information_schema.statistics a
 where {(ignoreCase ? "lower(a.table_schema)" : "a.table_schema")} in ({databaseIn}) and {loc8}
 ";

Providers/FreeSql.Provider.Odbc/MySql/OdbcMySqlCodeFirst.cs

@@ -257,7 +257,7 @@ from information_schema.columns a
 select 
 a.column_name,
 a.index_name 'index_id',
-0 'IsDesc',
+case when a.collation = 'D' then 1 else 0 end 'IsDesc',
 case when a.non_unique = 0 then 1 else 0 end 'IsUnique'
 from information_schema.statistics a
 where a.table_schema IN ({0}) and a.table_name IN ({1}) and a.index_name <> 'PRIMARY'", tboldname ?? tbname);

Providers/FreeSql.Provider.Odbc/MySql/OdbcMySqlDbFirst.cs

@@ -298,7 +298,7 @@ from information_schema.columns a
 case when a.non_unique = 0 then 1 else 0 end 'IsUnique',
 case when a.index_name = 'PRIMARY' then 1 else 0 end 'IsPrimaryKey',
 0 'IsClustered',
-0 'IsDesc'
+case when a.collation = 'D' then 1 else 0 end 'IsDesc'
 from information_schema.statistics a
 where {(ignoreCase ? "lower(a.table_schema)" : "a.table_schema")} in ({databaseIn}) and {loc8}
 ";