如何将数组写入Objective-C的sqlite数据库？

Question

I have taken the data from database into array now I want it to send it back into database by using the insert query.

How can I insert the array of the data into the database?

Answer 1

Inserting into the database is pretty much the reverse of reading from it. You don't say what the structure of your array is but here is some skeleton code you should be able to adapt to your needs:

// 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

迭代数组的内容并构建INSERT查询。