resultMapNode.getStringAttribute('A','B');这个方法很简单, 我看了一下,意思就是xnode 的attribute 属性里面如果key A 对应的value 是null 那么就将B 的值赋给A ;attribute的类型是Property继承自HashTable; 那么下面代码的意思是: String type = resultMapNode.getStringAttribute("type", resultMapNode.getSt...
NOT NULL约束是一种数据库约束,用于确保表中的某个列不接受空值。当试图向该列插入空值时,数据库会触发NOT NULL约束失败的错误。 代码1299 SQLITE_CONSTRAINT_NOTNULL是SQLite数据库中的错误代码,表示NOT NULL约束失败。 解决该错误的方法是确保向该列插入的值不为空。可以通过以下方式解决: 检查插入的数据...
-1); return; } if (sqlite3_value_type(argv[0]) == SQLITE_NULL) { sqlit...
If an UPDATE statement attempts to set an integer primary key or rowid column to a NULL or blob value, or to a string or real value that cannot be losslessly converted to an integer, a "datatype mismatch" error occurs and the statement is aborted. If an INSERT statement attempts to ins...
abs(X)abs(X)返回 X 的绝对值。Abs(X) returns NULL if X is NULL.Abs(X) return 0.0 if X is a string or blob that cannot be converted to a numeric value. If X is
NULL空值。INTEGER值是一个带符号的整数，根据值的大小存储在1、2、3、4、6或8字节中。REAL浮点数字...
The SQLITE_CONSTRAINT code can also be used as the return value from thexBestIndex()method of avirtual tableimplementation. When xBestIndex() returns SQLITE_CONSTRAINT, that indicates that the particular combination of inputs submitted to xBestIndex() cannot result in a usable query plan and shou...
Columns in the result set include the column name, data type, whether or not the column can be NULL, and the default value for the column. The "pk" column in the result set is zero for columns that are not part of the primary key, and is the index of the column in the primary ...
Cannot add a REFERENCES column with non-NULL default value] // name: 'SequelizeDatabaseError', // message: 'SQLITE_ERROR: Cannot add a REFERENCES column with non-NULL default value', // parent: // { [Error: SQLITE_ERROR: Cannot add a REFERENCES column with non-NULL default value] //...
void sqlite3_result_null(sqlite3_context*); void sqlite3_result_text(sqlite3_context*, const char *, int n, void(*)(void*)); void sqlite3_result_text16(sqlite3_context*, const void*, int n, void(*)(void*)); void sqlite3_result_value(sqlite3_context*, sqlite3_value*); void ...