Sqlite保存/检索文本

Question

我有一个UITextview作为注释，当用户输入一些文本并点击保存按钮时，注释视图将为空，文本应保存在数据库中，重新打开应用程序后，相应的文本应显示在相应的标题上。

如何使用sqlite数据库执行这些操作？

这就是我的尝试。

-(void)readText
{ 

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"data.sqlite"];
    sqlite3 *database;

    if(sqlite3_open([path UTF8String], &database) == SQLITE_OK) 
    {

        NSString *query=@"select Notes from dataTable where title like ?"; 

        const char *sqlStatement=[query UTF8String];

        sqlite3_stmt *compiledStatement;

        sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL);

        if( sqlite3_prepare_v2(database, sqlStatement, -1, & compiledStatement, NULL) == SQLITE_OK ) 
        {
            sqlite3_bind_text(compiledStatement,1,[selString UTF8String],-1,SQLITE_STATIC);

            while(sqlite3_step(compiledStatement) == SQLITE_ROW) 
            {
                NSString * pno3=[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement,9)];
                [loadNotes addObject:pno3];





            }
        }
    }

}







-(IBAction)saveText {

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"data.sqlite"];
    sqlite3 *database;
    if(sqlite3_open([path UTF8String], &database) == SQLITE_OK) 
    {

        const char *sqlStatement = "insert into dataTable(Notes) values(?)";

        sqlite3_stmt *compiledStatement;
        if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) 
        {
            NSString * data9=[NSString stringWithFormat:@"%@",[loadNotes objectAtIndex:0]];
            sqlite3_bind_text(compiledStatement,9,[data9 UTF8String],-1,SQLITE_STATIC);
        }
        sqlite3_finalize(compiledStatement);
    }
    sqlite3_close(database);
}