简单封装sqlite数据库操作类 BaseDB 用于完成对sqlite的增删改查，使用前先导入libsqlite3.0.dylib库

//
//  BaseDB.h
//  SqliteDemo
//
//  Created by 赵超 on 14-8-26.
//  Copyright (c) 2014年 赵超. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "sqlite3.h"

@interface BaseDB : NSObject

/**
 *  创建一个表
 *  sql:执行的SQL语句
 *  dataName:数据库名称
 */

-(void) createTable:(NSString*)sql dataBaseName:(NSString*) dataName;
/**
 *  执行SQL语句，主要完成增加、修改、删除
 *  sql:执行的SQL语句
 *  params:SQL语句中的参数
 *  dataName:数据库名称
 */
-(BOOL) execSql:(NSString*)sql parmas:(NSArray*) params dataBaseName:(NSString*)dataName;
/**
 *  选择数据
 *  sql:查询的SQL语句
 *  params:查询SQL语句中的参数
 *  dataName:查询数据库名称
 */

-(NSMutableArray*) selectSql:(NSString*)sql parmas:(NSArray*) params dataBaseName:(NSString*)dataName;



@end

创建的数据库文件位于 /Users/zhaochao/Library/Application Support/iPhone Simulator/7.1/Applications/07D17328-B63C-4D87-9B6C-03AA5CD681EA/Documents/zhaochao.sqlite，

就是 NSString *fileName=[NSHomeDirectory() stringByAppendingFormat:@"/Documents/%@",name]; 这个目录。文件可以直接用SQLiteManager软件打开，也可以在firefox浏览器中安装sqlitemanager插件打开，如下图

3.BaseDB.m

//
//  BaseDB.m
//  SqliteDemo
//
//  Created by 赵超 on 14-8-26.
//  Copyright (c) 2014年 赵超. All rights reserved.
//

#import "BaseDB.h"
@implementation BaseDB

/*
 *  获取沙盒目录
 *  name:追加的目录aa
 *
 */
-(NSString*) DataBaseName:(NSString *) name {
     NSString *fileName=[NSHomeDirectory() stringByAppendingFormat:@"/Documents/%@",name];
    return fileName;
}
/**
 *  选择数据
 *  sql:查询的SQL语句
 *  params:查询SQL语句中的参数
 *  dataName:查询数据库名称
 */
 
-(NSMutableArray*) selectSql:(NSString *)sql parmas:(NSArray *)params dataBaseName:(NSString *)dataName{
    
    sqlite3 *sqlite=nil;
    sqlite3_stmt *stmt=nil;
    //打开数据库
    NSString *fileName=[self DataBaseName:dataName];
    int result= sqlite3_open([fileName UTF8String], &sqlite);
    if (result!=SQLITE_OK) {
        NSLog(@"打开失败");
        return nil;
    }
    const char* sqlCh=[sql UTF8String];
    //编译SQL语句
    sqlite3_prepare_v2(sqlite, sqlCh, -1, &stmt, NULL);
    //绑定参数
    for (int i=0; i<params.count; i++) {
        NSString *param=[params objectAtIndex:i];
        sqlite3_bind_text(stmt, i+1, [param UTF8String], -1, NULL);
    }

    //执行查询语句
    result=sqlite3_step(stmt);
    
    NSMutableArray *resultData=[NSMutableArray array];
    //遍历结果
    while (result==SQLITE_ROW) {
        NSMutableDictionary *resultRow=[NSMutableDictionary dictionary];
        //获取字段个数
        int col_count = sqlite3_column_count(stmt);
        for (int i=0; i<col_count; i++) {
             //获取字段名称
            const char*columName=sqlite3_column_name(stmt,i);
            //获取字段值
            char* columValue=(char*) sqlite3_column_text(stmt, i);
            NSString  *columkeyStr=[NSString stringWithCString:columName encoding:NSUTF8StringEncoding];
            NSString *columValueStr=[NSString stringWithCString:columValue encoding:NSUTF8StringEncoding];
            [resultRow setObject:columValueStr forKey:columkeyStr];
        }
        [resultData addObject:resultRow];
        result=sqlite3_step(stmt);
    }
    //关闭数据库句柄
    sqlite3_finalize(stmt);
    //关闭数据库
    sqlite3_close(sqlite);
    NSLog(@"查询完！");
    return  resultData;
}
/**
 *  执行SQL语句，主要完成增加、修改、删除
 *  sql:执行的SQL语句
 *  params:SQL语句中的参数
 *  dataName:数据库名称
 */

-(BOOL) execSql:(NSString *)sql parmas:(NSArray *)params dataBaseName:(NSString *)dataName{
    sqlite3 *sqlite=nil;
    sqlite3_stmt *stmt=nil;
    //打开数据库
    NSString *fileName=[self DataBaseName:dataName];
    int result= sqlite3_open([fileName UTF8String], &sqlite);
    if (result!=SQLITE_OK) {
        NSLog(@"打开失败");
        return NO;
    }
    const char* sqlCh=[sql UTF8String];
    //编译SQL语句
    sqlite3_prepare_v2(sqlite, sqlCh, -1, &stmt, NULL);
    //绑定参数
    for (int i=0; i<params.count; i++) {
        NSString *parm=[params objectAtIndex:i];
        sqlite3_bind_text(stmt, i+1, [parm UTF8String], -1, NULL);
    }
    //执行SQL
    result=sqlite3_step(stmt);
    if (result==SQLITE_ERROR || result==SQLITE_MISUSE) {
        NSLog(@"执行SQL语句失败");
        sqlite3_close(sqlite);
        return  NO;
    }
    //关闭数据库句柄
    sqlite3_finalize(stmt);
    //关闭数据库
    sqlite3_close(sqlite);
    NSLog(@"执行成功！");
    return YES;
}

/**
 *  创建一个表
 *  sql:执行的SQL语句
 *  dataName:数据库名称
 */
-(void)createTable:(NSString *)sql dataBaseName:(NSString *)dataName{
    sqlite3 *sqlite=nil;
    NSString *fileName=[self DataBaseName:dataName];
    //打开数据库
    int result= sqlite3_open([fileName UTF8String], &sqlite);
    if (result!=SQLITE_OK) {
        NSLog(@"打开失败");
    }else{
        const char* sqlCh=[sql UTF8String];
        char* error;
        //执行SQL
        int result=sqlite3_exec(sqlite, sqlCh, NULL, NULL, &error);
        if (result!=SQLITE_OK) {
            NSLog(@"创建失败");
            NSLog(@"%s",error);
            sqlite3_close(sqlite);
            return ;
        }
        //关闭数据库
        sqlite3_close(sqlite);
        NSLog(@"创建成功");
    }
    
}



@end

4.调用格式

    
    BaseDB *db=[[BaseDB alloc] init];
    //创建表
    NSString *dbCreate=@"create table zhaochao( username text primary key,userPasswd test)";
    NSString *dbName=@"zhaochao.sqlite";
   // [db createTable:dbCreate dataBaseName:dbName];
    
    //添加数据
    NSString *insertTable=@"insert into zhaochao (username,userPasswd) values (?,?)";
    NSArray  *insertParmas=@[@"acasdfaa",@"bb"];
   // [db execSql:insertTable parmas:insertParmas dataBaseName:@"zhaochao.sqlite"];
    
    //修改数据
    NSString *updateTable=@"update zhaochao set username=? where username=?";
    NSArray  *updateParams=@[@"admin",@"zhaochao"];
   // [db execSql:updateTable parmas:updateParams dataBaseName:@"zhaochao.sqlite"];
    
    //删除数据
    NSString *deleteTable=@"delete from zhaochao where username=?";
    NSArray   *deleteParams=@[@"aa"];
   // [db execSql:deleteTable parmas:deleteParams dataBaseName:@"zhaochao.sqlite"];
    
    //查询数据
    NSString *selectTable=@"select username,userPasswd from zhaochao where userPasswd=?";
    NSString *selectParam=@[@"bb"];
    NSArray *result=[db selectSql:selectTable parmas:selectParam dataBaseName:@"zhaochao.sqlite"];
    for (int i=0; i<result.count; i++) {
        NSMutableDictionary *arr=[result objectAtIndex:i];
        NSLog(@"%@",arr);
    }