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SQLITE Source Analysis (14)

Disclaimer: The SQLite source code analysis series Xing (**deepfuture.javaeye**/) original, without author authorization, any human institution can not be reproduced

** Sqlite3_exec () callback function of the first two parameters is the result of the number of columns, the first three parameters

** From sqlite3_column_text () for each column array of string pointers, for the relevant results column

** ^ The 2nd argument to the sqlite3_exec () callback function is the

** Number of columns in the result. ^ The 3rd argument to the sqlite3_exec ()

** Callback is an array of pointers to strings obtained as if from

** [Sqlite3_column_text ()], one for each column. ^ If an element of a

** Result row is NULL then the corresponding string pointer for the

** Sqlite3_exec () callback is a NULL pointer. ^ The 4th argument to the

** Sqlite3_exec () callback is an array of pointers to strings where each

** Entry represents the name of corresponding result column as obtained

** From [sqlite3_column_name ()].

** If the results row is an element of NULL, then sqlite3_exec () callback pointer to the corresponding string

** Is NULL. sqlite3_exec () callback of the first four parameters is an array of string pointers, for the relevant results column name, from sqlite3_column_name () was

** ^ If the 2nd parameter to sqlite3_exec () is a NULL pointer, a pointer

** To an empty string, or a pointer that contains only whitespace and / or

** SQL comments, then no SQL statements are evaluated and the database

** Is not changed.

** If sqlite3_exec () The first two parameters (SQL statements) for the null pointer, an empty string or contains only spaces in the SQL, no SQL statement is executed, the database will not change.
标签: column name, null pointer, parameters, sql statements, sql statement, source code analysis, element, empty string, exec, source analysis, result row, human institution, array of pointers, relevant results, column text, result column
分类: Database
时间: 2010-08-26

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