iOS中sqlite的详细用法

#import <sqlite3.h>@interface ViewController (){ sqlite3 *_sqldb;}@end@implementation ViewController- (void)viewDidLoad{ [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. [self OpenDb]; [self createTable]; [self insertData]; [self FindData];}//打开数据库-(void)OpenDb{  NSArray *arrs= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //创建数据库，如果数据库存在就直接打开，不存在就创建打开 NSString *path=[arrs lastObject] ; NSString *documentpath= [path stringByAppendingPathComponent:@"sql.db"]; int reslut= sqlite3_open([documentpath UTF8String], &_sqldb); if(reslut==SQLITE_OK){ NSLog(@"数据库已被打开"); } }//通过数据库实例创建表-(void)createTable{ //不带参数的sql语句 const char* sql="create table if not exists t_person (id integer primary key autoincrement,name text,age integer);"; char *error; //sqlite3_exec可以执行一切不带参数的SQL语句。如果是带参数最好不用，防止SQL注入漏洞攻击 int resutl= sqlite3_exec(_sqldb, sql, NULL, NULL, &error); if(resutl==SQLITE_OK){ NSLog(@"创建表成功"); }else{ NSLog(@"创建表失败－－》%s",error);}}//插入数据-(void)insertData{ //带参数的SQL语句 "?"是带参数的占位符 const char * sql="insert into t_person(name,age) values(?,?);"; sqlite3_stmt *stmp; //在执行SQL语句之前检查SQL语句语法,-1代表字符串的长度 int result= sqlite3_prepare_v2(_sqldb, sql, -1, &stmp, NULL); if(result==SQLITE_OK){ NSLog(@"插入SQL语句语法没有问题"); //绑定参数,插入的参数的下标是从1开始 sqlite3_bind_text(stmp, 1, "gcb", -1, NULL); sqlite3_bind_int(stmp, 2, 12);  //执行参参数的SQL语句，不能有exec int result=sqlite3_step(stmp); //插入进行判断,要用sqLite_Done来判断 if(result==SQLITE_DONE){  NSLog(@"插入成功"); } else{  NSLog(@"插入失败") ; }  } else{ NSLog(@"插入SQL语句有问题"); }}-(void)FindData{ char *sql="select id,name,age from t_person"; //查询做好用step执行 sqlite3_stmt *stmt; //检查SQL语句的语法问题 int result= sqlite3_prepare_v2(_sqldb, sql, -1, &stmt, NULL); if(result==SQLITE_OK){ while (sqlite3_step(stmt)==SQLITE_ROW) {  //查询的列是0开始 插入的列从1开始//  int xh＝sqlite3_column_int(stmt, 0);  int xh=sqlite3_column_int(stmt, 0);  char * name=(char *)sqlite3_column_text(stmt, 1);  int age=sqlite3_column_int(stmt, 2);  NSLog(@"xh=%i-->name=%s-->age=%i",xh,name,age);       } } else{ NSLog(@"查询SQL语法有误"); }}