Support "show tables;"

Author: Banyc

README.md

@@ -58,6 +58,8 @@ flush
 
 use database DATABASE_NAME
 drop database DATABASE_NAME
+
+show tables;
 ```
 
 ## Spec

src/MiniSQL.Api/Controllers/ApiController.cs

@@ -63,6 +63,9 @@ private SelectResult HandleStatement(IStatement statement)
                 case StatementType.SelectStatement:
                     selectResult = HandleSelectStatement((SelectStatement)statement);
                     break;
+                case StatementType.ShowStatement:
+                    selectResult = HandleSelectStatement((ShowStatement)statement);
+                    break;
                 case StatementType.ExecFileStatement:
                     throw new Exception("Impossible reach");
             }
@@ -136,6 +139,25 @@ private void HandleStatement(DeleteStatement statement)
             _catalogManager.TryUpdateSchemaRecord(statement.TableName, newTableRootPage);
         }
 
+        private SelectResult HandleSelectStatement(ShowStatement statement)
+        {
+            List<SchemaRecord> tableSchemas = _catalogManager.GetTablesSchemaRecord();
+            SelectResult result = new SelectResult();
+            result.ColumnDeclarations = new List<AttributeDeclaration>() { new AttributeDeclaration() {AttributeName = "Table", Type = AttributeTypes.Char, CharLimit = 80}};
+            result.Rows = new List<List<AtomValue>>();
+            foreach (SchemaRecord tableSchema in tableSchemas)
+            {
+                List<AtomValue> row = new List<AtomValue>();
+                AtomValue col = new AtomValue();
+                col.Type = AttributeTypes.Char;
+                col.CharLimit = 80;
+                col.StringValue = tableSchema.Name;
+                row.Add(col);
+                result.Rows.Add(row);
+            }
+            return result;
+        }
+
         private SelectResult HandleSelectStatement(SelectStatement statement)
         {
             bool isIndexTreeAvailable = false;

src/MiniSQL.CatalogManager/Catalog.cs renamed to src/MiniSQL.CatalogManager/Controllers/Catalog.cs

@@ -4,7 +4,7 @@
 using MiniSQL.Library.Interfaces;
 using MiniSQL.Library.Models;
 
-namespace MiniSQL.CatalogManager
+namespace MiniSQL.CatalogManager.Controllers
 {
     //define all the functions 
     public class Catalog : ICatalogManager
@@ -315,5 +315,11 @@ public void CheckValidation(IStatement statement)
                 return;
             }
         }
+
+        public List<SchemaRecord> GetTablesSchemaRecord()
+        {
+            Catalog_table a = new Catalog_table(_databaseName);
+            return a.GetTablesSchemaRecord();
+        }
     }
 }

src/MiniSQL.CatalogManager/Controllers/Catalog_table.cs

@@ -68,7 +68,17 @@ public SchemaRecord GetTableSchemaRecord(string tableName)
             return s;
         }
 
-
+        //return the schema record of the table named table name
+        public List<SchemaRecord> GetTablesSchemaRecord()
+        {
+            List<SchemaRecord> list = new List<SchemaRecord>();
+            for (int i = 0; i < tables.Count; i++)
+            {
+                SchemaRecord target_table = GetTableSchemaRecord(tables[i].table_name);
+                list.Add(target_table);
+            }
+            return list;
+        }
 
         //to check if there is such a table named 'name'
         //if in,then return true. Vice versa

src/MiniSQL.CatalogManager/Program.cs

@@ -5,6 +5,7 @@
 using MiniSQL.Library.Interfaces;
 using System.Diagnostics;
 using System.IO;
+using MiniSQL.CatalogManager.Controllers;
 
 namespace MiniSQL.CatalogManager
 {

src/MiniSQL.Interpreter/Grammar/MiniSQL.g4

@@ -52,6 +52,7 @@ simpleStatement:
 
     | quitStatement
     | execFileStatement
+    | showTablesStatement
 ;
 
 quitStatement:
@@ -62,6 +63,10 @@ execFileStatement:
     EXECFILE_SYMBOL (SINGLE_QUOTED_TEXT | DOUBLE_QUOTED_TEXT)
 ;
 
+showTablesStatement:
+    SHOW_SYMBOL TABLES_SYMBOL
+;
+
 createStatement:
     CREATE_SYMBOL (
         createTable
@@ -323,6 +328,7 @@ DECIMAL_NUMBER: DIGITS? DOT_SYMBOL DIGITS;
 FLOAT_NUMBER:   (DIGITS? DOT_SYMBOL)? DIGITS [eE] (MINUS_OPERATOR | PLUS_OPERATOR)? DIGITS;
 
 
+SHOW_SYMBOL:                     S H O W;                                    // Custom
 EXECFILE_SYMBOL:                 E X E C F I L E;                            // Custom
 QUIT_SYMBOL:                     Q U I T;                                    // Custom
 AND_SYMBOL:                      A N D;                                      // SQL-2003-R

src/MiniSQL.Interpreter/Grammar/MiniSQL/MiniSQL.interp

@@ -3,108 +3,109 @@ BIN_NUMBER=2
 INT_NUMBER=3
 DECIMAL_NUMBER=4
 FLOAT_NUMBER=5
-EXECFILE_SYMBOL=6
-QUIT_SYMBOL=7
-AND_SYMBOL=8
-ASC_SYMBOL=9
-AS_SYMBOL=10
-BEGIN_SYMBOL=11
-BY_SYMBOL=12
-CHAR_SYMBOL=13
-CREATE_SYMBOL=14
-DELETE_SYMBOL=15
-DESC_SYMBOL=16
-DROP_SYMBOL=17
-FLOAT_SYMBOL=18
-FROM_SYMBOL=19
-INDEX_SYMBOL=20
-INSERT_SYMBOL=21
-INTO_SYMBOL=22
-INT_SYMBOL=23
-KEY_SYMBOL=24
-NOT_SYMBOL=25
-ON_SYMBOL=26
-ORDER_SYMBOL=27
-OR_SYMBOL=28
-PRIMARY_SYMBOL=29
-SELECT_SYMBOL=30
-TABLES_SYMBOL=31
-TABLE_SYMBOL=32
-UNIQUE_SYMBOL=33
-VALUES_SYMBOL=34
-VALUE_SYMBOL=35
-WHERE_SYMBOL=36
-WORK_SYMBOL=37
-XOR_SYMBOL=38
-EQUAL_OPERATOR=39
-ASSIGN_OPERATOR=40
-NULL_SAFE_EQUAL_OPERATOR=41
-GREATER_OR_EQUAL_OPERATOR=42
-GREATER_THAN_OPERATOR=43
-LESS_OR_EQUAL_OPERATOR=44
-LESS_THAN_OPERATOR=45
-NOT_EQUAL_OPERATOR=46
-PLUS_OPERATOR=47
-MINUS_OPERATOR=48
-MULT_OPERATOR=49
-DIV_OPERATOR=50
-MOD_OPERATOR=51
-LOGICAL_NOT_OPERATOR=52
-BITWISE_NOT_OPERATOR=53
-SHIFT_LEFT_OPERATOR=54
-SHIFT_RIGHT_OPERATOR=55
-LOGICAL_AND_OPERATOR=56
-BITWISE_AND_OPERATOR=57
-BITWISE_XOR_OPERATOR=58
-LOGICAL_OR_OPERATOR=59
-BITWISE_OR_OPERATOR=60
-DOT_SYMBOL=61
-COMMA_SYMBOL=62
-SEMICOLON_SYMBOL=63
-COLON_SYMBOL=64
-OPEN_PAR_SYMBOL=65
-CLOSE_PAR_SYMBOL=66
-OPEN_CURLY_SYMBOL=67
-CLOSE_CURLY_SYMBOL=68
-UNDERLINE_SYMBOL=69
-WHITESPACE=70
-IDENTIFIER=71
-NCHAR_TEXT=72
-DOUBLE_QUOTED_TEXT=73
-SINGLE_QUOTED_TEXT=74
-BLOCK_COMMENT=75
-POUND_COMMENT=76
-DASHDASH_COMMENT=77
-NOT_EQUAL2_OPERATOR=78
-'='=39
-':='=40
-'<=>'=41
-'>='=42
-'>'=43
-'<='=44
-'<'=45
-'!='=46
-'<>'=78
-'+'=47
-'-'=48
-'*'=49
-'/'=50
-'%'=51
-'!'=52
-'~'=53
-'<<'=54
-'>>'=55
-'&&'=56
-'&'=57
-'^'=58
-'||'=59
-'|'=60
-'.'=61
-','=62
-';'=63
-':'=64
-'('=65
-')'=66
-'{'=67
-'}'=68
-'_'=69
+SHOW_SYMBOL=6
+EXECFILE_SYMBOL=7
+QUIT_SYMBOL=8
+AND_SYMBOL=9
+ASC_SYMBOL=10
+AS_SYMBOL=11
+BEGIN_SYMBOL=12
+BY_SYMBOL=13
+CHAR_SYMBOL=14
+CREATE_SYMBOL=15
+DELETE_SYMBOL=16
+DESC_SYMBOL=17
+DROP_SYMBOL=18
+FLOAT_SYMBOL=19
+FROM_SYMBOL=20
+INDEX_SYMBOL=21
+INSERT_SYMBOL=22
+INTO_SYMBOL=23
+INT_SYMBOL=24
+KEY_SYMBOL=25
+NOT_SYMBOL=26
+ON_SYMBOL=27
+ORDER_SYMBOL=28
+OR_SYMBOL=29
+PRIMARY_SYMBOL=30
+SELECT_SYMBOL=31
+TABLES_SYMBOL=32
+TABLE_SYMBOL=33
+UNIQUE_SYMBOL=34
+VALUES_SYMBOL=35
+VALUE_SYMBOL=36
+WHERE_SYMBOL=37
+WORK_SYMBOL=38
+XOR_SYMBOL=39
+EQUAL_OPERATOR=40
+ASSIGN_OPERATOR=41
+NULL_SAFE_EQUAL_OPERATOR=42
+GREATER_OR_EQUAL_OPERATOR=43
+GREATER_THAN_OPERATOR=44
+LESS_OR_EQUAL_OPERATOR=45
+LESS_THAN_OPERATOR=46
+NOT_EQUAL_OPERATOR=47
+PLUS_OPERATOR=48
+MINUS_OPERATOR=49
+MULT_OPERATOR=50
+DIV_OPERATOR=51
+MOD_OPERATOR=52
+LOGICAL_NOT_OPERATOR=53
+BITWISE_NOT_OPERATOR=54
+SHIFT_LEFT_OPERATOR=55
+SHIFT_RIGHT_OPERATOR=56
+LOGICAL_AND_OPERATOR=57
+BITWISE_AND_OPERATOR=58
+BITWISE_XOR_OPERATOR=59
+LOGICAL_OR_OPERATOR=60
+BITWISE_OR_OPERATOR=61
+DOT_SYMBOL=62
+COMMA_SYMBOL=63
+SEMICOLON_SYMBOL=64
+COLON_SYMBOL=65
+OPEN_PAR_SYMBOL=66
+CLOSE_PAR_SYMBOL=67
+OPEN_CURLY_SYMBOL=68
+CLOSE_CURLY_SYMBOL=69
+UNDERLINE_SYMBOL=70
+WHITESPACE=71
+IDENTIFIER=72
+NCHAR_TEXT=73
+DOUBLE_QUOTED_TEXT=74
+SINGLE_QUOTED_TEXT=75
+BLOCK_COMMENT=76
+POUND_COMMENT=77
+DASHDASH_COMMENT=78
+NOT_EQUAL2_OPERATOR=79
+'='=40
+':='=41
+'<=>'=42
+'>='=43
+'>'=44
+'<='=45
+'<'=46
+'!='=47
+'<>'=79
+'+'=48
+'-'=49
+'*'=50
+'/'=51
+'%'=52
+'!'=53
+'~'=54
+'<<'=55
+'>>'=56
+'&&'=57
+'&'=58
+'^'=59
+'||'=60
+'|'=61
+'.'=62
+','=63
+';'=64
+':'=65
+'('=66
+')'=67
+'{'=68
+'}'=69
+'_'=70

src/MiniSQL.Interpreter/Grammar/MiniSQL/MiniSQL.tokens

@@ -83,6 +83,18 @@ public virtual void EnterExecFileStatement([NotNull] MiniSQLParser.ExecFileState
 	/// <param name="context">The parse tree.</param>
 	public virtual void ExitExecFileStatement([NotNull] MiniSQLParser.ExecFileStatementContext context) { }
 	/// <summary>
+	/// Enter a parse tree produced by <see cref="MiniSQLParser.showTablesStatement"/>.
+	/// <para>The default implementation does nothing.</para>
+	/// </summary>
+	/// <param name="context">The parse tree.</param>
+	public virtual void EnterShowTablesStatement([NotNull] MiniSQLParser.ShowTablesStatementContext context) { }
+	/// <summary>
+	/// Exit a parse tree produced by <see cref="MiniSQLParser.showTablesStatement"/>.
+	/// <para>The default implementation does nothing.</para>
+	/// </summary>
+	/// <param name="context">The parse tree.</param>
+	public virtual void ExitShowTablesStatement([NotNull] MiniSQLParser.ShowTablesStatementContext context) { }
+	/// <summary>
 	/// Enter a parse tree produced by <see cref="MiniSQLParser.createStatement"/>.
 	/// <para>The default implementation does nothing.</para>
 	/// </summary>

src/MiniSQL.Interpreter/Grammar/MiniSQL/MiniSQLBaseListener.cs

@@ -74,6 +74,16 @@ public partial class MiniSQLBaseVisitor<Result> : AbstractParseTreeVisitor<Resul
 	/// <return>The visitor result.</return>
 	public virtual Result VisitExecFileStatement([NotNull] MiniSQLParser.ExecFileStatementContext context) { return VisitChildren(context); }
 	/// <summary>
+	/// Visit a parse tree produced by <see cref="MiniSQLParser.showTablesStatement"/>.
+	/// <para>
+	/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
+	/// on <paramref name="context"/>.
+	/// </para>
+	/// </summary>
+	/// <param name="context">The parse tree.</param>
+	/// <return>The visitor result.</return>
+	public virtual Result VisitShowTablesStatement([NotNull] MiniSQLParser.ShowTablesStatementContext context) { return VisitChildren(context); }
+	/// <summary>
 	/// Visit a parse tree produced by <see cref="MiniSQLParser.createStatement"/>.
 	/// <para>
 	/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>