禁用NamedParameterJdbcTemplate缓存

Question

I want to change result set behavior of NamedParameterJdbcTemplate. (disable result set caching)

For example , with postgres jdbc driver you could change it like this:

        conn = datasource.getConnection();
        conn.setAutoCommit(false);
        stmt = conn.createStatement(java.sql.ResultSet.TYPE_FORWARD_ONLY, java.sql.ResultSet.CONCUR_READ_ONLY);
        stmt.setFetchSize(50);

How i can achieve it in spring / spring-boot ?

Answer 1

If the goal is to change a fetchSize then you can do it through a JdbcTemplate instance:

JdbcTemplate jdbcTemplate = new JdbcTemplate(datasource);
jdbcTemplate.setFetchSize(fetchSize);
NamedParameterJdbcTemplate template = new NamedParameterJdbcTemplate(jdbcTemplate);

UPD

Speaking of cache changing you may try to change a private volatile int cacheLimit of the NamedParameterJdbcTemplate instance:

NamedParameterJdbcTemplate template = new NamedParameterJdbcTemplate(jdbcTemplate);
template.setCacheLimit(0);

it possible but i didn't explore it