Add 'SHOW COLUMNS FROM table' (#728)

Author: oshai

src/main/java/net/sf/jsqlparser/statement/ShowStatement.java

@@ -0,0 +1,53 @@
+/*
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2017 JSQLParser
+ * %%
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 2.1 of the
+ * License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Lesser Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Lesser Public
+ * License along with this program.  If not, see
+ * <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ * #L%
+ */
+package net.sf.jsqlparser.statement;
+
+/**
+ *
+ * @author oshai
+ */
+public class ShowStatement implements Statement {
+
+    private String tableName;
+
+    public ShowStatement(String tableName) {
+        this.tableName = tableName;
+    }
+
+    public String getTableName() {
+        return tableName;
+    }
+
+    public void setTableName(String tableName) {
+        this.tableName = tableName;
+    }
+
+    @Override
+    public String toString() {
+        return "SHOW COLUMNS FROM " + tableName;
+    }
+
+    @Override
+    public void accept(StatementVisitor statementVisitor) {
+        statementVisitor.visit(this);
+    }
+}

src/main/java/net/sf/jsqlparser/statement/StatementVisitor.java

@@ -73,6 +73,8 @@ public interface StatementVisitor {
 
     void visit(SetStatement set);
 
+    void visit(ShowStatement set);
+
     void visit(Merge merge);
 
     void visit(Select select);

src/main/java/net/sf/jsqlparser/statement/StatementVisitorAdapter.java

@@ -123,6 +123,10 @@ public void visit(SetStatement set) {
 
     }
 
+    @Override
+    public void visit(ShowStatement set) {
+    }
+
     @Override
     public void visit(Merge merge) {
 

src/main/java/net/sf/jsqlparser/util/TablesNamesFinder.java

@@ -97,6 +97,7 @@
 import net.sf.jsqlparser.statement.Block;
 import net.sf.jsqlparser.statement.Commit;
 import net.sf.jsqlparser.statement.SetStatement;
+import net.sf.jsqlparser.statement.ShowStatement;
 import net.sf.jsqlparser.statement.Statement;
 import net.sf.jsqlparser.statement.StatementVisitor;
 import net.sf.jsqlparser.statement.Statements;
@@ -747,6 +748,11 @@ public void visit(SetStatement set) {
         throw new UnsupportedOperationException(NOT_SUPPORTED_YET);
     }
 
+    @Override
+    public void visit(ShowStatement set) {
+        throw new UnsupportedOperationException(NOT_SUPPORTED_YET);
+    }
+
     @Override
     public void visit(RowConstructor rowConstructor) {
         for (Expression expr : rowConstructor.getExprList().getExpressions()) {

src/main/java/net/sf/jsqlparser/util/deparser/ShowStatementDeParser.java

@@ -0,0 +1,45 @@
+/*
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2017 JSQLParser
+ * %%
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 2.1 of the
+ * License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Lesser Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Lesser Public
+ * License along with this program.  If not, see
+ * <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ * #L%
+ */
+package net.sf.jsqlparser.util.deparser;
+
+import net.sf.jsqlparser.statement.ShowStatement;
+
+public class ShowStatementDeParser {
+
+    protected StringBuilder buffer;
+
+    public ShowStatementDeParser(StringBuilder buffer) {
+        this.buffer = buffer;
+    }
+
+    public StringBuilder getBuffer() {
+        return buffer;
+    }
+
+    public void setBuffer(StringBuilder buffer) {
+        this.buffer = buffer;
+    }
+
+    public void deParse(ShowStatement show) {
+        buffer.append("SHOW COLUMNS FROM ").append(show.getTableName());
+    }
+}

src/main/java/net/sf/jsqlparser/util/deparser/StatementDeParser.java

@@ -25,6 +25,7 @@
 import net.sf.jsqlparser.statement.Block;
 import net.sf.jsqlparser.statement.Commit;
 import net.sf.jsqlparser.statement.SetStatement;
+import net.sf.jsqlparser.statement.ShowStatement;
 import net.sf.jsqlparser.statement.Statement;
 import net.sf.jsqlparser.statement.StatementVisitor;
 import net.sf.jsqlparser.statement.Statements;
@@ -231,6 +232,11 @@ public void visit(UseStatement use) {
         new UseStatementDeParser(buffer).deParse(use);
     }
 
+    @Override
+    public void visit(ShowStatement show) {
+        new ShowStatementDeParser(buffer).deParse(show);
+    }
+
     @Override
     public void visit(Block block) {
         buffer.append("BEGIN\n");

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -161,6 +161,7 @@ TOKEN: /* SQL Keywords. prefixed with K_ to avoid name clashes */
 |   <K_CHECK:"CHECK">
 |   <K_CHAR:"CHAR">
 |   <K_COLUMN:"COLUMN">
+|   <K_COLUMNS:"COLUMNS">
 |   <K_COMMIT:"COMMIT">
 |   <K_COMMENT:"COMMENT">
 |   <K_CONNECT:"CONNECT">
@@ -269,6 +270,7 @@ TOKEN: /* SQL Keywords. prefixed with K_ to avoid name clashes */
 |   <K_SEMI : "SEMI">
 |   <K_SEPARATOR:"SEPARATOR">
 |   <K_SET:"SET">
+|   <K_SHOW : "SHOW">
 |   <K_SIBLINGS:"SIBLINGS">
 |   <K_SKIP: "SKIP">
 |   <K_SOME:"SOME">
@@ -424,6 +426,8 @@ Statement SingleStatement() :
         |
         stm = Set()
         |
+        stm = Show()
+        |
         stm = Use()
         |
         stm = Commit() 
@@ -528,6 +532,16 @@ UseStatement Use(): {
     }
 }
 
+ShowStatement Show(): {
+    String tableName;
+}
+{
+    <K_SHOW> <K_COLUMNS> <K_FROM> tableName = RelObjectNameExt()
+    {
+        return new ShowStatement(tableName);
+    }
+}
+
 ValuesStatement Values(): {
     List<Expression> expList = new ArrayList<Expression>();
     Expression exp;
@@ -1387,6 +1401,7 @@ MySQLIndexHint MySQLIndexHint():
 }
 {
 	(actionToken = <K_USE>
+	| actionToken = <K_SHOW>
 	| actionToken = <K_IGNORE>
 	| actionToken = <K_FORCE> )
 	(indexToken = <K_INDEX>

src/test/java/net/sf/jsqlparser/statement/ShowStatementTest.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2015 JSQLParser.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package net.sf.jsqlparser.statement;
+
+import net.sf.jsqlparser.JSQLParserException;
+import org.junit.Test;
+
+import static net.sf.jsqlparser.test.TestUtils.assertSqlCanBeParsedAndDeparsed;
+
+/**
+ *
+ * @author oshai
+ */
+public class ShowStatementTest {
+
+
+    @Test
+    public void testSimpleUse() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("SHOW COLUMNS FROM mydatabase");
+    }
+}