如何將數組寫入sqlite數據庫的objective-c？

Question

我已經把數據從數據庫中取出到數組中，現在我希望它通過使用插入查詢將其發送回數據庫。如何將數據數組插入數據庫中。

Answer 1

插入數據庫幾乎與讀取數據的方式相反。你沒有說你陣列的結構是什麼，但是這裏有一些骨架代碼，你應該可以適應你的需求：

// Assuming you have the sqlite database opened already 
// sqlite3 *sqldb = ...; 

// Also assuming you have an array of MyItems holding your data 
// NSMutableArray *items = ...; 

sqlite3_stmt *insert_statement; 

// Prepare the insert statement 
const char*sql = "INSERT INTO mytable (field1, field2, field3) VALUES(?,?,?)"; 
sqlite3_prepare_v2(sqldb, sql, -1, &insert_statement, NULL); 

// Iterate over an array of dictionaries 
for (MyItem *item in items) { 

    // Bind variables - assumed to all be integers 
    sqlite3_bind_int(insert_statement, 1, item.field1); 
    sqlite3_bind_int(insert_statement, 2, item.field2); 
    sqlite3_bind_int(insert_statement, 3, item.field3); 

    // Execute the insert 
    if (sqlite3_step(insert_statement) != SQLITE_DONE) { 
     NSLog(@"Insert failed: %s", sqlite3_errmsg(sqldb)); 
    } 

    // Reset the statement 
    sqlite3_reset(insert_statement); 
} 

// release the statement 
sqlite3_finalize(insert_statement); 

Answer 2

遍歷數組的內容並建立INSERT查詢。