Oracle中id自增_java oracle id 自增

oracle创建主键自增可以采取两种方式

方式一：创建序列

create sequence OCR_TEMPLATE_seq --序列名
increment by 1 --自增基数
start with 1 --从1开始自增
nomaxvalue --无最大值
nominvalue --无最小值
nocycle --累加 不循环
nocache; --无缓存

方式二：创建触发器

create or replace trigger OCR_TEMPLATE_seq  
before insert on OCR_TEMPLATE for each row 
begin 
	select OCR_TEMPLATE_seq.nextval into :new.id from dual; 
end;

对应的mybatisMapper

<insert id="insertSelective" parameterType="test.model.OcrTemplate">
        <!--@mbg.generated-->
        <selectKey keyProperty="id" resultType="java.math.BigDecimal" order="BEFORE">
            SELECT OCR_TEMPLATE_SEQ.NEXTVAL
            FROM DUAL
        </selectKey>
        insert into OCR_TEMPLATE
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="ocrCode != null and ocrCode != ''">
                OCR_CODE,
            </if>
            <if test="ocrTemplateName != null and ocrTemplateName != ''">
                OCR_TEMPLATE_NAME,
            </if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            <if test="ocrCode != null and ocrCode != ''">
                #{ocrCode,jdbcType=VARCHAR},
            </if>
            <if test="ocrTemplateName != null and ocrTemplateName != ''">
                #{ocrTemplateName,jdbcType=VARCHAR},
            </if>
        </trim>
    </insert>