Issue #420 Like Expression with Escape Expression (#1406)

* Issue #420 Like Expression with Escape Expression

Fixes issue #420

* CheckStyle compliance

Author: manticore-projects

src/main/java/net/sf/jsqlparser/expression/StringValue.java

@@ -11,6 +11,8 @@
 
 import java.util.Arrays;
 import java.util.List;
+import java.util.Objects;
+
 import net.sf.jsqlparser.parser.ASTNodeAccessImpl;
 
 /**
@@ -95,4 +97,21 @@ public StringValue withValue(String value) {
         this.setValue(value);
         return this;
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        StringValue that = (StringValue) o;
+        return Objects.equals(value, that.value) && Objects.equals(prefix, that.prefix);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(value, prefix);
+    }
 }

src/main/java/net/sf/jsqlparser/expression/operators/relational/LikeExpression.java

@@ -16,7 +16,7 @@
 public class LikeExpression extends BinaryExpression {
 
     private boolean not = false;
-    private String escape = null;
+    private Expression escapeExpression = null;
     private boolean caseInsensitive = false;
 
     public boolean isNot() {
@@ -40,19 +40,19 @@ public String getStringExpression() {
     @Override
     public String toString() {
         String retval = getLeftExpression() + " " + (not ? "NOT " : "") + getStringExpression() + " " + getRightExpression();
-        if (escape != null) {
-            retval += " ESCAPE " + "'" + escape + "'";
+        if (escapeExpression != null) {
+            retval += " ESCAPE "  + escapeExpression ;
         }
 
         return retval;
     }
 
-    public String getEscape() {
-        return escape;
+    public Expression getEscape() {
+        return escapeExpression;
     }
 
-    public void setEscape(String escape) {
-        this.escape = escape;
+    public void setEscape(Expression escapeExpression) {
+        this.escapeExpression = escapeExpression;
     }
 
     public boolean isCaseInsensitive() {
@@ -63,7 +63,7 @@ public void setCaseInsensitive(boolean caseInsensitive) {
         this.caseInsensitive = caseInsensitive;
     }
 
-    public LikeExpression withEscape(String escape) {
+    public LikeExpression withEscape(Expression escape) {
         this.setEscape(escape);
         return this;
     }

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

@@ -264,9 +264,10 @@ public void visit(JdbcParameter jdbcParameter) {
     public void visit(LikeExpression likeExpression) {
         visitBinaryExpression(likeExpression,
                 (likeExpression.isNot() ? " NOT" : "") + (likeExpression.isCaseInsensitive() ? " ILIKE " : " LIKE "));
-        String escape = likeExpression.getEscape();
+        Expression escape = likeExpression.getEscape();
         if (escape != null) {
-            buffer.append(" ESCAPE '").append(escape).append('\'');
+            buffer.append(" ESCAPE ");
+            likeExpression.getEscape().accept(this);
         }
     }
 

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

@@ -3198,10 +3198,11 @@ Expression LikeExpression(Expression leftExpression) #LikeExpression:
 {
     LikeExpression result = new LikeExpression();
     Expression rightExpression = null;
+    Expression escape;
 }
 {
     [<K_NOT> { result.setNot(true); } ] ( <K_LIKE> | <K_ILIKE> { result.setCaseInsensitive(true); } ) rightExpression=SimpleExpression()
-    [<K_ESCAPE> token=<S_CHAR_LITERAL> { result.setEscape((new StringValue(token.image)).getValue()); }]
+    [<K_ESCAPE> escape=Expression() { result.setEscape(escape); }]
     {
         result.setLeftExpression(leftExpression);
         result.setRightExpression(rightExpression);

src/test/java/net/sf/jsqlparser/expression/LikeExpressionTest.java

@@ -0,0 +1,28 @@
+/*-
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2021 JSQLParser
+ * %%
+ * Dual licensed under GNU LGPL 2.1 or Apache License 2.0
+ * #L%
+ */
+
+package net.sf.jsqlparser.expression;
+
+import net.sf.jsqlparser.JSQLParserException;
+import net.sf.jsqlparser.test.TestUtils;
+import org.junit.Test;
+
+/**
+ *
+ * @author <a href="mailto:andreas@manticore-projects.com">Andreas Reichel</a>
+ */
+public class LikeExpressionTest {
+  @Test
+  public void testLikeWithEscapeExpressionIssue420() throws JSQLParserException {
+    TestUtils.assertExpressionCanBeParsedAndDeparsed("a LIKE ?1 ESCAPE ?2", true);
+
+    TestUtils.assertSqlCanBeParsedAndDeparsed("select * from dual where a LIKE ?1 ESCAPE ?2", true);
+  }
+}

src/test/java/net/sf/jsqlparser/statement/select/SelectTest.java

@@ -1446,7 +1446,7 @@ public void testLike() throws JSQLParserException {
         plainSelect = (PlainSelect) select.getSelectBody();
         assertEquals("test", ((StringValue) ((LikeExpression) plainSelect.getWhere()).
                 getRightExpression()).getValue());
-        assertEquals("test2", ((LikeExpression) plainSelect.getWhere()).getEscape());
+        assertEquals(new StringValue("test2"), ((LikeExpression) plainSelect.getWhere()).getEscape());
     }
 
     @Test