sketching another alternative to byte[] queries

Author: greenrobot

DaoCore/src/main/java/de/greenrobot/dao/internal/SqlUtils.java

@@ -148,12 +148,16 @@ public static String createSqlUpdate(String tablename, String[] updateColumns, S
     }
 
     public static String escapeBlobArgument(byte[] bytes) {
+        return "X'" + toHex(bytes) + '\'';
+    }
+
+    public static String toHex(byte[] bytes) {
         char[] hexChars = new char[bytes.length * 2];
         for (int i = 0; i < bytes.length; i++) {
             int byteValue = bytes[i] & 0xFF;
             hexChars[i * 2] = HEX_ARRAY[byteValue >>> 4];
             hexChars[i * 2 + 1] = HEX_ARRAY[byteValue & 0x0F];
         }
-        return "X'" + new String(hexChars) + '\'';
+        return new String(hexChars);
     }
 }

DaoTest/src/de/greenrobot/daotest/query/QueryBuilderSimpleTest.java

@@ -182,6 +182,11 @@ public void testEqByteArray() {
         dao.update(testEntity);
 
         // Unsupported: Query<TestEntity> query = dao.queryBuilder().where(Properties.SimpleByteArray.eq(byteArray)).build();
+
+        // Works, but probably voids any index on BLOBs (Note: there's no hex2blob function and X'?' is bad syntax):
+        // String conditionString = "HEX(" + Properties.SimpleByteArray.columnName + ")=?";
+        // WhereCondition condition = new WhereCondition.StringCondition(conditionString, SqlUtils.toHex(byteArray));
+
         String conditionString = Properties.SimpleByteArray.columnName + '=' + SqlUtils.escapeBlobArgument(byteArray);
         WhereCondition condition = new WhereCondition.StringCondition(conditionString);
         Query<TestEntity> query = dao.queryBuilder().where(condition).build();