delete support varchar field

Author: raymondchen-byte

databend-jdbc/src/main/java/com/databend/jdbc/DatabendPreparedStatement.java

@@ -455,7 +455,11 @@ public void setBigDecimal(int i, BigDecimal bigDecimal)
     public void setString(int i, String s)
             throws SQLException {
         checkOpen();
-        batchInsertUtils.ifPresent(insertUtils -> insertUtils.setPlaceHolderValue(i, s));
+        if (originalSql.toLowerCase().contains("delete from")) {
+            batchInsertUtils.ifPresent(insertUtils -> insertUtils.setPlaceHolderValue(i, String.format("%s%s%s", "'", s, "'")));
+        } else {
+            batchInsertUtils.ifPresent(insertUtils -> insertUtils.setPlaceHolderValue(i, s));
+        }
     }
 
     @Override

databend-jdbc/src/test/java/com/databend/jdbc/TestPrepareStatement.java

@@ -342,6 +342,14 @@ public void testAllPreparedStatement() throws SQLException {
             int result = statement.executeUpdate();
             System.out.println(result);
         }
+
+        String deleteSQLVarchar = "delete from test_prepare_statement where b = ?";
+        try (PreparedStatement statement = conn.prepareStatement(deleteSQLVarchar)) {
+            statement.setString(1, "1");
+            int result = statement.executeUpdate();
+            System.out.println(result);
+        }
+
         ResultSet r3 = conn.createStatement().executeQuery("select * from test_prepare_statement");
         Assert.assertEquals(0, r3.getRow());
         while (r3.next()) {