2019年1月7日-乐观锁和悲观锁-小总结

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乐观锁

<update id="updateByVersion" parameterType="com.crossoverJie.pojo.PriceVersion">
    UPDATE price_version
    SET front = #{front,jdbcType=DECIMAL},
        version= version + 1
    WHERE id = #{id,jdbcType=INTEGER}
    AND version = #{version,jdbcType=INTEGER}
</update>

悲观锁

SET AUTOCOMMIT=0; 
BEGIN WORK; 
SELECT quantity FROM products WHERE id=3 FOR UPDATE;
UPDATE products SET quantity = '1' WHERE id=3 ; 
COMMIT WORK;

redis实现

zookeeper实现