Add a method to get an index

Src/Asp.Net/SqlSugar/Abstract/DbMaintenanceProvider/Methods.cs

@@ -84,6 +84,10 @@ namespace SqlSugar
                  return result.Select(it => it.DbColumnName).ToList();
              });
         }
+        public virtual List<string> GetIndexList() 
+        {
+            return new List<string>();
+        }
         #endregion
 
         #region Check

Src/Asp.Net/SqlSugar/Interface/IDbMaintenance.cs

@@ -17,6 +17,7 @@ namespace SqlSugar
         List<string> GetIsIdentities(string tableName);
         List<string> GetPrimaries(string tableName);
         List<string> GetProcList(string dbName);
+        List<string> GetIndexList();
         #endregion
 
         #region Check

Src/Asp.Net/SqlSugar/Realization/Dm/DbMaintenance/DmDbMaintenance.cs

@@ -266,6 +266,11 @@ namespace SqlSugar
         #endregion
 
         #region Methods
+        public override List<string> GetIndexList()
+        {
+            var sql = $"SELECT index_name FROM user_indexes";
+            return this.Context.Ado.SqlQuery<string>(sql);
+        }
         public override bool AddColumn(string tableName, DbColumnInfo columnInfo)
         {
             if (columnInfo.DataType == "varchar" && columnInfo.Length == 0)

Src/Asp.Net/SqlSugar/Realization/Kdbndp/DbMaintenance/KdbndpDbMaintenance.cs

@@ -240,6 +240,16 @@ namespace SqlSugar
         #endregion
 
         #region Methods
+        public override List<string> GetIndexList()
+        {
+            var sql = $"SELECT indexname FROM pg_indexes WHERE UPPER(schemaname) = UPPER('" + GetSchema() + "') ";
+            return this.Context.Ado.SqlQuery<string>(sql);
+        }
+        public override List<string> GetProcList(string dbName)
+        {
+            var sql = $"SELECT proname FROM pg_proc p JOIN pg_namespace n ON p.pronamespace = n.oid WHERE n.nspname = '{dbName}'";
+            return this.Context.Ado.SqlQuery<string>(sql);
+        }
         private string GetSchema()
         {
             var schema = "public";

Src/Asp.Net/SqlSugar/Realization/MySql/DbMaintenance/MySqlDbMaintenance.cs

@@ -282,6 +282,11 @@ namespace SqlSugar
         #endregion
 
         #region Methods
+        public override List<string> GetIndexList()
+        {
+            var sql = $"SELECT index_name FROM information_schema.statistics WHERE table_schema = '" + this.Context.Ado.Connection.Database + "'";
+            return this.Context.Ado.SqlQuery<string>(sql);
+        }
         public override List<string> GetProcList(string dbName)
         {
             var sql = $"SELECT ROUTINE_NAME FROM information_schema.ROUTINES WHERE ROUTINE_TYPE = 'PROCEDURE' AND ROUTINE_SCHEMA = '{dbName}'";

Src/Asp.Net/SqlSugar/Realization/Oracle/DbMaintenance/OracleDbMaintenance.cs

@@ -272,6 +272,11 @@ namespace SqlSugar
         #endregion
 
         #region Methods
+        public override List<string> GetIndexList()
+        {
+            var sql = $"SELECT index_name FROM user_indexes";
+            return this.Context.Ado.SqlQuery<string>(sql);
+        }
         public override List<string> GetProcList(string dbName)
         {
             var sql = $"SELECT OBJECT_NAME FROM ALL_OBJECTS WHERE OBJECT_TYPE = 'PROCEDURE' AND OWNER = '{dbName.ToUpper()}'";

Src/Asp.Net/SqlSugar/Realization/PostgreSQL/DbMaintenance/PostgreSQLDbMaintenance.cs

@@ -249,6 +249,11 @@ namespace SqlSugar
         #endregion
 
         #region Methods
+        public override List<string> GetIndexList()
+        {
+            var sql = $"SELECT indexname FROM pg_indexes WHERE schemaname = '"+GetSchema()+"'";
+            return this.Context.Ado.SqlQuery<string>(sql);
+        }
         public override List<string> GetProcList(string dbName)
         {
             var sql = $"SELECT proname FROM pg_proc p JOIN pg_namespace n ON p.pronamespace = n.oid WHERE n.nspname = '{dbName}'";

Src/Asp.Net/SqlSugar/Realization/SqlServer/DbMaintenance/SqlServerDbMaintenance.cs

@@ -321,6 +321,10 @@ namespace SqlSugar
         #endregion
 
         #region Methods
+        public override List<string> GetIndexList()
+        {
+           return this.Context.Ado.SqlQuery<string>("SELECT name FROM sys.indexes WHERE objectproperty(object_id, 'IsUserTable') = 1");
+        }
         public override List<string> GetProcList(string dbName)
         {
             var sql = $"SELECT name FROM {dbName}.sys.procedures";

Src/Asp.Net/SqlSugar/Realization/Sqlite/DbMaintenance/SqliteDbMaintenance.cs

@@ -258,6 +258,11 @@ namespace SqlSugar
         #endregion
 
         #region Methods
+        public override List<string> GetIndexList()
+        {
+            var sql = $"SELECT name FROM sqlite_master WHERE type='index'";
+            return this.Context.Ado.SqlQuery<string>(sql);
+        }
         public override void AddDefaultValue(EntityInfo entityInfo)
         {
            //sqlite no support AddDefaultValue