JDBC, MySQL: getting bits into a BIT(M!=1) column

Question

I\'m new to using JDBC + MySQL.

I have several 1/0 values which I want to stick into a database with a PreparedStatement. The destination column is a BIT(M!=1). I\

Answer 1

To set a BIT(M) column in MySQL

For M==1

setBoolean(int parameterIndex, boolean x)

From the javadoc

Sets the designated parameter to the given Java boolean value. The driver converts this to an SQL BIT value when it sends it to the database.

---

For M>1

The support for BIT(M) where M!=1 is problematic with JDBC as BIT(M) is only required with "full" SQL-92 and only few DBs support that.

Check here Mapping SQL and Java Types: 8.3.3 BIT

The following works for me with MySQL (at least with MySQL 5.0.45, Java 1.6 and MySQL Connector/J 5.0.8)

...
PreparedStatement insert = con.prepareStatement(
    "INSERT INTO bittable (bitcolumn) values (b?)"
);
insert.setString(1,"111000");
...

This uses the special b'110101010' syntax of MySQL to set the value for BIT columns.

Answer 2

You can use get/setObject with a byte array (byte[]). 8 bits are packed into each byte with the least significant bit being in the last array element.