SQLite错误总结 error code 19: constraint failed

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SQLite错误总结 error code 19: constraint failed

SQLite错误总结 1. android.database.sqlite.SQLiteConstraintException: error code 19: constraint failed错误原因情况1:你定义的字段为 not null而插入时对应的字段却没值. 情况2:你定义的字段设定PRIMARY,而插入的值已经在表中存在. 情况3:在进行修改的时候set的id与where的id不同.2.列命名规则情况1:保留词不应作为列明,如group.index…

SQLite 基础不扎实造成的：error code 19: constraint failed

感谢大佬:https://www.cnblogs.com/flintlovesam/p/5241866.html (https://www.cnblogs.com/flintlovesam/p/5241866.html) SQLite错误总结 android.database.sqlite.SQLiteConstraintException: error code 19: constraint failed错误原因情况1:你定义的字段为 not null而插入时对应的字段却没值. 情况2:你定…

java Class的Long id初始化为0的问题android数据库操做出现的 android.database.sqlite.SQLiteConstraintException: error code 19: constraint failed

java的class中的Long类型变量调用默认的构造函数new后会被初始化为0. 这句话大家可能感觉这么低级的事情还用你说? 我想说的是这个会产生的一个应用场景和避免方法场景:db插入时候primarykey是 Long值的id 那么插入的时候会默认把这个值一并插入的吧!但是大家知道这不可以! 所以如何避免初始化的时候不用初始化这个值呢? 很简单,既然是构造函数的问题那么就使用构造函数来处理, 例如: Class student{ private Long id; private S…

mysql错误：Error Code: 1175. You are using safe update mode and you tried to update a table……

今天遇到一个mysql错误: Error Code: . You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the option in Preferences -> SQL Queries and reconnect. 网上查了一下,原来是SET SQL_SAFE_UPDATES设置…

MySQL错误：Error Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the option in Preferences -> SQL easonjim

错误: Error Code: . You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the option in Preferences -> SQL Queries and reconnect. 这是因为MySQL运行在safe-updates模式下,该模式会导致非主键条件下无法执行u…