SQL doesn't allow inserting a completely empty row without naming at least one column name. If your provided values is empty, no column names are known and an empty row can't be inserted. If not set to null, the nullColumnHack parameter provides the name of nullable column name to explici...
no column names are known and an empty row can't be inserted. If not set tonull, the nullColumnHack parameter provides the name of nullable column name to explicitly insert a NULL into in thecasewhere
nullable=false,unique=true,length=64)privateString username;@Column(name="password",nullable=false,length=255)privateString password;@Column(name="salt",nullable=false,length=16)privateString salt;@Column(name="status",nullable=false,length=16,columnDefinition="VARCHAR(16) DEFAULT 'active'")private...
1,先定义一个table,Link是string?,但是没有定义[SugarColumn(IsNullable = true)] internal class PhotoDetails { [SugarColumn(IsPrimaryKey = true, IsIdentity = true)] public int Id { get; set; } public string? Link { get; set; } } 这种情况下,虽然Link在C#是nullable,但是对sqlite是notnullable...
Column('ip',String(20),nullable=True), Column('hostname',String(20),nullable=True), ) meta.create_all(engine)#创建表,如果存在则忽视 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20.
[Column(TypeName="text")] publicDateTimeCreatedTime{get;set;} } /// ///实体类型定义,此处使用codefirstfluentapi方式 /// internalclassMyEntityTypeConfiguration:IEntityTypeConfiguration<MyEntity> { publicvoidConfigure(EntityTypeBuilder<MyEntity>entity) { entity.ToTable(nameof...
column [constraint constraint_name] constraint_type, 表约束级别 column,... [constraint constraint_name] constraint_type (column,...) 表级的约束除not null外都可以。 unique 约束的列可以包含多行NULL值,因为空值被认为不等于任何值。 由于多列上的unique约束的搜索机制,在部分空值组合unique关键字约束的非...
2019-12-16 15:50 −一篇文章的正文,需要很多字数,默认就是255,不够 @Lob @Basic @Type(type = "text") @Column(name = "detail", nullable = true) public String getDetail() { return ... 不打鱼光晒网 0 1198 Sqlite—删除语句(Delete) ...
我一开始以为让所有的 SQLite Statement 共用一个(作为静态变数的) nullable OpaquePointer 就可以了,于是我一开始的设计就是让辞典模组在 deinit() 的时候才跑一次「 sqlite3_finalize()」。因为原厂词库是只读的、在 App Bundle 内,所以我将 journal 塞在了运存内。 结果呢?施工完毕之后,单元测试啥的都成功通...
E/SQLiteLog: (1) no such column: David in "select contraseña from datos where nombre =David" D/AndroidRuntime: Shutting down VM E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.iniciosesin2, PID: 19037 java.lang.IllegalStateException: Could not execute method for android:on...