Iphone App的Sqlite查询中的变量/参数 [英] Variables/parameters in Sqlite query for Iphone App

问题描述

在我的Iphone App中我创建了这个查询：

In my Iphone App I have created this query:

"SELECT * FROM visuel where id_visuel = 1"

所以我有这个功能非常好：

And so I have this function that works very well:

- (void)getVisuel {

    visuelArray = [[NSMutableArray alloc] init];

    sqlite3 *database;

    if(sqlite3_open([self.databasePath UTF8String], &database) == SQLITE_OK) {
        sqlite3_reset(getVisuelStatement);

        while(sqlite3_step(getVisuelParcStatement) == SQLITE_ROW) {
            NSString *aTitle = [NSString stringWithUTF8String:(char *)sqlite3_column_text(getVisuelStatement , 2)];
            NSString *aLpath = [NSString stringWithUTF8String:(char *)sqlite3_column_text(getVisuelStatement , 3)];

            Visuel *aVisuel = [[Visuel alloc] initWithName:aTitle lpath:aLpath];

            [visuelArray addObject:aVisuel];
        }
    }
    sqlite3_close(database);

}

我想要的是更改查询像这样：SELECT * FROM visuel where id_visuel =？
我不想拥有静态ID，但我不知道该怎么做。

What I want is to change the query like this: "SELECT * FROM visuel where id_visuel = ?" I don't want to have a static id, but I don't know how to do that.

谢谢，

推荐答案

好吧，首先将查询更改为参数化查询，就像在那里一样。然后，在您调用 sqlite3_step 之前，将正确的id绑定到参数：

Well, first change your query to your parameterized query like you have there. Then, just before you call sqlite3_step bind the right id to the parameter:

sqlite3_reset(getVisuelStatement);

//Add these two lines
int visuelId = 1;  //Put whatever id you want in here.
sqlite3_bind_int(getVisuelParcStatement, 1, visuelId);

while(sqlite3_step(getVisuelParcStatement) == SQLITE_ROW) {

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