Fix #1686: add support for creating views with "IF NOT EXISTS" clause

src/main/java/net/sf/jsqlparser/statement/create/view/CreateView.java

@@ -30,6 +30,7 @@ public class CreateView implements Statement {
  private ForceOption force = ForceOption.NONE;
  private TemporaryOption temp = TemporaryOption.NONE;
  private boolean withReadOnly = false;
+ private boolean ifNotExists = false;
 
  @Override
  public void accept(StatementVisitor statementVisitor) {
@@ -103,6 +104,14 @@ public void setWithReadOnly(boolean withReadOnly) {
  this.withReadOnly = withReadOnly;
  }
 
+ public boolean isIfNotExists() {
+ return ifNotExists;
+ }
+
+ public void setIfNotExists(boolean ifNotExists) {
+ this.ifNotExists = ifNotExists;
+ }
+
  @Override
  public String toString() {
  StringBuilder sql = new StringBuilder("CREATE ");
@@ -129,6 +138,9 @@ public String toString() {
  }
  sql.append("VIEW ");
  sql.append(view);
+ if (ifNotExists) {
+ sql.append(" IF NOT EXISTS");
+ }
  if (columnNames != null) {
  sql.append(PlainSelect.getStringList(columnNames, true, true));
  }

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

@@ -60,6 +60,9 @@ public void deParse(CreateView createView) {
  buffer.append("MATERIALIZED ");
  }
  buffer.append("VIEW ").append(createView.getView().getFullyQualifiedName());
+ if (createView.isIfNotExists()) {
+ buffer.append(" IF NOT EXISTS");
+ }
  if (createView.getColumnNames() != null) {
  buffer.append(PlainSelect.getStringList(createView.getColumnNames(), true, true));
  }

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

@@ -5420,6 +5420,7 @@ CreateView CreateView():
  ]
  [ <K_MATERIALIZED> { createView.setMaterialized(true);} ]
  <K_VIEW> view=Table() { createView.setView(view); }
+ [ LOOKAHEAD(3) <K_IF> <K_NOT> <K_EXISTS> {createView.setIfNotExists(true);} ]
  [ columnNames = ColumnsNamesList() { createView.setColumnNames(columnNames); } ]
  <K_AS>
  select=SelectWithWithItems( ) { createView.setSelect(select); }

src/test/java/net/sf/jsqlparser/statement/create/CreateViewTest.java

@@ -18,6 +18,8 @@
 import static net.sf.jsqlparser.test.TestUtils.*;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
 import org.junit.jupiter.api.Test;
 
 public class CreateViewTest {
@@ -121,4 +123,19 @@ public void testCreateTemporaryViewIssue665() throws JSQLParserException {
  public void testCreateWithReadOnlyViewIssue838() throws JSQLParserException {
  assertSqlCanBeParsedAndDeparsed("CREATE VIEW v14(c1, c2) AS SELECT c1, C2 FROM t1 WITH READ ONLY");
  }
+
+ @Test
+ public void testCreateViewIfNotExists() throws JSQLParserException {
+ String stmt = "CREATE VIEW myview IF NOT EXISTS AS SELECT * FROM mytab";
+ CreateView createView = (CreateView) assertSqlCanBeParsedAndDeparsed(stmt);
+ assertTrue(createView.isIfNotExists());
+ }
+
+ @Test
+ public void testCreateMaterializedViewIfNotExists() throws JSQLParserException {
+ String stmt = "CREATE MATERIALIZED VIEW myview IF NOT EXISTS AS SELECT * FROM mytab";
+ CreateView createView = (CreateView) assertSqlCanBeParsedAndDeparsed(stmt);
+ assertTrue(createView.isMaterialized());
+ assertTrue(createView.isIfNotExists());
+ }
 }