ODBC: MS Access could not link to a table with a name containing '_'.

h2/src/main/org/h2/command/Parser.java

@@ -2373,6 +2373,9 @@ public class Parser {
                     r = ValueExpression.get(ValueTimestamp.getNoCopy(ValueTimestamp.parseTimestamp(timestamp)));
                 } else if (equalsToken("E", name) && currentTokenType == VALUE && currentValue.getType() == Value.STRING) {
                     String text = currentValue.getString();
+                    // the PostgreSQL ODBC driver uses
+                    // LIKE E'PROJECT\\_DATA' instead of LIKE 'PROJECT\_DATA'
+                    text = StringUtils.replaceAll(text, "\\\\", "\\");
                     read();
                     r = ValueExpression.get(ValueString.get(text));
                 } else {
@@ -2476,11 +2479,21 @@ public class Parser {
         }
         if (readIf("::")) {
             // PostgreSQL compatibility
-            Column col = parseColumn(null);
-            Function function = Function.getFunction(database, "CAST");
-            function.setDataType(col);
-            function.setParameter(0, r);
-            r = function;
+            if (readIf("REGCLASS")) {
+                FunctionAlias f = findFunctionAlias(Constants.SCHEMA_MAIN, "PG_GET_OID");
+                if (f == null) {
+                    throw getSyntaxError();
+                }
+                Expression[] args = { r };
+                JavaFunction func = new JavaFunction(f, args);
+                r = func;
+            } else {
+                Column col = parseColumn(null);
+                Function function = Function.getFunction(database, "CAST");
+                function.setDataType(col);
+                function.setParameter(0, r);
+                r = function;
+            }
         }
         return r;
     }
@@ -4090,7 +4103,6 @@ public class Parser {
         return command;
     }
 
-
     private AlterSequence parseAlterSequence() {
         String sequenceName = readIdentifierWithSchema();
         Sequence sequence = getSchema().getSequence(sequenceName);

h2/src/main/org/h2/server/pg/PgServer.java

@@ -294,6 +294,27 @@ public class PgServer implements Service {
         return rs.getString(1);
     }
 
+    /**
+     * Get the OID of an object.
+     * This method is called by the database.
+     *
+     * @param conn the connection
+     * @param tableName the table name
+     * @return the oid
+     */
+    public static int getOid(Connection conn, String tableName) throws SQLException {
+        if (tableName.startsWith("\"") && tableName.endsWith("\"")) {
+            tableName = tableName.substring(1, tableName.length() - 1);
+        }
+        PreparedStatement prep = conn.prepareStatement("select oid from pg_class where relname = ?");
+        prep.setString(1, tableName);
+        ResultSet rs = prep.executeQuery();
+        if (!rs.next()) {
+            return 0;
+        }
+        return rs.getInt(1);
+    }
+
     /**
      * Get the name of this encoding code.
      * This method is called by the database.

h2/src/main/org/h2/server/pg/pg_catalog.sql

@@ -11,6 +11,9 @@ create schema pg_catalog;
 drop alias if exists pg_convertType;
 create alias pg_convertType deterministic for "org.h2.server.pg.PgServer.convertType";
 
+drop alias if exists pg_get_oid;
+create alias pg_get_oid deterministic for "org.h2.server.pg.PgServer.getOid";
+
 create table pg_catalog.pg_version as select 1 as version;
 
 create view pg_catalog.pg_roles -- (oid, rolname, rolcreaterole, rolcreatedb)

h2/src/test/org/h2/test/testSimple.in.txt

+select E'test\\test';
+> test\test;
 create table a(id int) as select null;
 create table b(id int references a(id)) as select null;
 delete from a;