From e9475c0507863062460d4dcc0eea043e1f7ffe6d Mon Sep 17 00:00:00 2001
From: XudongXie <xiexudong23@otcaix.iscas.ac.cn>
Date: Tue, 10 Sep 2024 16:09:24 +0800
Subject: [PATCH] add select

---
 sqlTranslate/.idea/workspace.xml              | 25 +++++++++++--------
 .../main/java/Document/DropTable in Oracle    |  1 +
 .../java/Document/Insert statement in Oracle  |  2 ++
 .../java/Document/Select statement in Oracle  | 23 +++++++++++++++--
 sqlTranslate/src/main/java/Document/Todolist  |  2 +-
 .../src/main/java/Lexer/OracleLexer.java      |  4 ++-
 .../java/Parser/AST/Select/SelectObjNode.java | 15 ++++++++++-
 7 files changed, 57 insertions(+), 15 deletions(-)
 create mode 100644 sqlTranslate/src/main/java/Document/DropTable in Oracle
 create mode 100644 sqlTranslate/src/main/java/Document/Insert statement in Oracle

diff --git a/sqlTranslate/.idea/workspace.xml b/sqlTranslate/.idea/workspace.xml
index fb9ca0c35..b0ee1e813 100644
--- a/sqlTranslate/.idea/workspace.xml
+++ b/sqlTranslate/.idea/workspace.xml
@@ -4,16 +4,13 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="d8d12963-4777-48e3-9669-309cf5e41d60" name="更改" comment="add todolist">
-      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectEndNode.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectNode.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectObjNode.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectOptionNode.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectTableNode.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectUnionNode.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectWhereClauseNode.java" afterDir="false" />
+    <list default="true" id="d8d12963-4777-48e3-9669-309cf5e41d60" name="更改" comment="add select">
+      <change afterPath="$PROJECT_DIR$/src/main/java/Document/Insert statement in Oracle" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/Document/Select statement in Oracle" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Document/Select statement in Oracle" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/src/main/java/Document/Todolist" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Document/Todolist" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/Lexer/OracleLexer.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Lexer/OracleLexer.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectObjNode.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectObjNode.java" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -279,7 +276,14 @@
       <option name="project" value="LOCAL" />
       <updated>1725896687932</updated>
     </task>
-    <option name="localTasksCounter" value="25" />
+    <task id="LOCAL-00025" summary="add select">
+      <created>1725937361130</created>
+      <option name="number" value="00025" />
+      <option name="presentableId" value="LOCAL-00025" />
+      <option name="project" value="LOCAL" />
+      <updated>1725937361130</updated>
+    </task>
+    <option name="localTasksCounter" value="26" />
     <servers />
   </component>
   <component name="Vcs.Log.Tabs.Properties">
@@ -306,7 +310,8 @@
     <MESSAGE value="finish the framework of sqltranslate (createTab sql is now being supported!)" />
     <MESSAGE value="add insert sql" />
     <MESSAGE value="add todolist" />
-    <option name="LAST_COMMIT_MESSAGE" value="add todolist" />
+    <MESSAGE value="add select" />
+    <option name="LAST_COMMIT_MESSAGE" value="add select" />
   </component>
   <component name="XDebuggerManager">
     <watches-manager>
diff --git a/sqlTranslate/src/main/java/Document/DropTable in Oracle b/sqlTranslate/src/main/java/Document/DropTable in Oracle
new file mode 100644
index 000000000..a78f4257a
--- /dev/null
+++ b/sqlTranslate/src/main/java/Document/DropTable in Oracle	
@@ -0,0 +1 @@
+DROP TABLE _table (CASCADE CONSTRAINTS)?
\ No newline at end of file
diff --git a/sqlTranslate/src/main/java/Document/Insert statement in Oracle b/sqlTranslate/src/main/java/Document/Insert statement in Oracle
new file mode 100644
index 000000000..d45fb273f
--- /dev/null
+++ b/sqlTranslate/src/main/java/Document/Insert statement in Oracle	
@@ -0,0 +1,2 @@
+INSERT INTO employees (first_name, last_name, email) VALUES ('Jane', 'Smith', 'janesm@example.com');
+INSERT INTO employees VALUES ('Jane', 'Smith', 'janesm@example.com');
\ No newline at end of file
diff --git a/sqlTranslate/src/main/java/Document/Select statement in Oracle b/sqlTranslate/src/main/java/Document/Select statement in Oracle
index d45fb273f..562fc9275 100644
--- a/sqlTranslate/src/main/java/Document/Select statement in Oracle	
+++ b/sqlTranslate/src/main/java/Document/Select statement in Oracle	
@@ -1,2 +1,21 @@
-INSERT INTO employees (first_name, last_name, email) VALUES ('Jane', 'Smith', 'janesm@example.com');
-INSERT INTO employees VALUES ('Jane', 'Smith', 'janesm@example.com');
\ No newline at end of file
+SELECT DISTINCT? select_obj FROM select_tab where_clause? select_option? union_clause? ;
+select_obj = * | column* | function
+select_tab = table join_clause?
+select_option = GROUP BY | ORDER BY | HAVING
+function = COUNT() | SUM() | AVG() | MAX() | MIN()
+
+example:
+    SELECT * FROM employees;
+    SELECT employee_id, first_name, last_name FROM employees;
+    SELECT * FROM employees WHERE department_id = 10;
+    SELECT * FROM employees ORDER BY hire_date DESC;
+    SELECT COUNT(*), AVG(salary) FROM employees;
+    SELECT department_id, COUNT(*) FROM employees GROUP BY department_id;
+    SELECT e.first_name, d.department_name FROM employees e JOIN departments d ON e.department_id = d.department_id;
+    SELECT
+        column1,
+        CASE WHEN column2 > 0 THEN 'Positive' ELSE 'Non-positive' END as status,
+        SUBSTR(column3, 1, 5) as substring_column3
+    FROM table_name;
+    SELECT column1, COUNT(column2) FROM table_name GROUP BY column1 HAVING COUNT(column2) > 10;
+
diff --git a/sqlTranslate/src/main/java/Document/Todolist b/sqlTranslate/src/main/java/Document/Todolist
index e5bafb050..bc134a5ef 100644
--- a/sqlTranslate/src/main/java/Document/Todolist
+++ b/sqlTranslate/src/main/java/Document/Todolist
@@ -8,7 +8,7 @@ Operation
  update... set
  delete
  if... elsif... else... end if
- case... when... then
+ case... when... then 1
  loop... end loop
  while... loop... end loop
  for ... in () loop end loop
diff --git a/sqlTranslate/src/main/java/Lexer/OracleLexer.java b/sqlTranslate/src/main/java/Lexer/OracleLexer.java
index 5d5fe81fb..e0f4ef895 100644
--- a/sqlTranslate/src/main/java/Lexer/OracleLexer.java
+++ b/sqlTranslate/src/main/java/Lexer/OracleLexer.java
@@ -17,7 +17,9 @@ public class OracleLexer {
             "NOT NULL", "PRIMARY KEY", "UNIQUE", "CHECK", "REFERENCES", "DEFAULT",
             "CONSTRAINT", "FOREIGN KEY"
             // keywords of drop table
-            ,"DROP", "CASCADE", "CONSTRAINTS"
+            , "DROP", "CASCADE", "CONSTRAINTS"
+            // keywords of select
+            , "DISTINCT", "JOIN", "GROUP BY", "ORDER BY", "HAVING", "UNION", "CASE", "WHEN", "END", "AS"
     };
     private static final Pattern TOKEN_PATTERN = Pattern.compile(
             "(NUMBER\\(.*?\\))|" +                     // NUMBER() function
diff --git a/sqlTranslate/src/main/java/Parser/AST/Select/SelectObjNode.java b/sqlTranslate/src/main/java/Parser/AST/Select/SelectObjNode.java
index 3ceb5140d..a6e22f9b8 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Select/SelectObjNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Select/SelectObjNode.java
@@ -9,11 +9,24 @@ public class SelectObjNode extends ASTNode {
     public SelectObjNode(List<Token> tokens)
     {
         super(tokens);
+        this.isDistinct = "";
     }
 
     public SelectObjNode(ASTNode node)
     {
         super(node);
+        this.isDistinct = "";
+    }
+
+    private String isDistinct;
+
+    public String getIsDistinct()
+    {
+        return isDistinct;
+    }
+
+    public void setIsDistinct(String isDistinct) {
+        this.isDistinct = isDistinct + " ";
     }
 
     @Override
@@ -33,7 +46,7 @@ public class SelectObjNode extends ASTNode {
     @Override
     public void visit(ASTNode node, StringBuilder queryString)
     {
-        queryString.append(toString() + " FROM ");
+        queryString.append(isDistinct + toString() + " FROM ");
         for (ASTNode child : getChildren())
         {
             child.visit(child, queryString);