Question

hibernatetemplate＆＃39; s bulkUpdate实际上是bulkUpdate吗？我查看了代码，它似乎没有bulkUpdate。或许我错过了什么？

public int bulkUpdate(final String queryString, final Object... values) throws DataAccessException {
        return executeWithNativeSession(new HibernateCallback<Integer>() {
            public Integer doInHibernate(Session session) throws HibernateException {
                Query queryObject = session.createQuery(queryString);
                prepareQuery(queryObject);
                if (values != null) {
                    for (int i = 0; i < values.length; i++) {
                        queryObject.setParameter(i, values[i]);
                    }
                }
                return queryObject.executeUpdate();
            }
        });
    }

而JdbcTemplate batchUpdate（看起来像）正在做batchUpdate

public int[] batchUpdate(final String[] sql) throws DataAccessException {
        Assert.notEmpty(sql, "SQL array must not be empty");
        if (logger.isDebugEnabled()) {
            logger.debug("Executing SQL batch update of " + sql.length + " statements");
        }
        class BatchUpdateStatementCallback implements StatementCallback<int[]>, SqlProvider {
            private String currSql;
            public int[] doInStatement(Statement stmt) throws SQLException, DataAccessException {
                int[] rowsAffected = new int[sql.length];
                if (JdbcUtils.supportsBatchUpdates(stmt.getConnection())) {
                    for (String sqlStmt : sql) {
                        this.currSql = sqlStmt;
                        stmt.addBatch(sqlStmt);
                    }
                    rowsAffected = stmt.executeBatch();
                }
                else {
                    for (int i = 0; i < sql.length; i++) {
                        this.currSql = sql[i];
                        if (!stmt.execute(sql[i])) {
                            rowsAffected[i] = stmt.getUpdateCount();
                        }
                        else {
                            throw new InvalidDataAccessApiUsageException("Invalid batch SQL statement: " + sql[i]);
                        }
                    }
                }
                return rowsAffected;
            }
            public String getSql() {
                return this.currSql;
            }
        }
        return execute(new BatchUpdateStatementCallback());
    }

Answer 1

是的，它正在进行批量更新。如您所见，DELETE方法中执行的INSERT和bulkUpdate查询可以影响多行。这就是为什么它们被称为批量操作。

要点是拥有方便的方法来执行更新和执行查询并返回批量操作中受影响的行数。另外，它包装了DataAccessException的异常。

hibernatetemplate的bulkupdate有什么意义？

1 个答案: