Field 'id' doesn't have a default value
2018-01-15 11:13
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Field 'id' doesn't have a default value
意思是“id”没有一个默认值
原因
因为主键生成策略为:<generator class="native" />
native代表什么呢?
根据底层数据库的能力选择 identity、sequence 或者 hilo 中的一个;
identity :自增,由数据库生成,返回的标识符是long, short或int类型的。(主要用在mysql中)
sequence :根据数据库序列生成标识符,返回的标识符是long, short或者int类型的。
hilo :使用一个高/低位算法来高效的生成long,short或者int类型的标识符。
而数据库的主键类型为:varchar
将hibernate主键生成策略改成uuid
uuid.hex/uuid :用一个128-bit的UUID算法生成32位字符串类型的标识符。
意思是“id”没有一个默认值
原因
因为主键生成策略为:<generator class="native" />
native代表什么呢?
根据底层数据库的能力选择 identity、sequence 或者 hilo 中的一个;
identity :自增,由数据库生成,返回的标识符是long, short或int类型的。(主要用在mysql中)
sequence :根据数据库序列生成标识符,返回的标识符是long, short或者int类型的。
hilo :使用一个高/低位算法来高效的生成long,short或者int类型的标识符。
而数据库的主键类型为:varchar
将hibernate主键生成策略改成uuid
uuid.hex/uuid :用一个128-bit的UUID算法生成32位字符串类型的标识符。
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