spring jdbcTemplate源码剖析

@Override
public int update(final String sql) throws DataAccessException {
Assert.notNull(sql, "SQL must not be null");
if (logger.isDebugEnabled()) {
logger.debug("Executing SQL update [" + sql + "]");
}
class UpdateStatementCallback implements StatementCallback<Integer>, SqlProvider {
@Override
public Integer doInStatement(Statement stmt) throws SQLException {
int rows = stmt.executeUpdate(sql);
if (logger.isDebugEnabled()) {
logger.debug("SQL update affected " + rows + " rows");
}
return rows;
}
@Override
public String getSql() {
return sql;
}
}
return execute(new UpdateStatementCallback());
}