IOS sqlite数据库增删改查

1.简单介绍

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

2.BaseDB.h

//
//  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:运行的SQL语句
*  dataName:数据库名称
*/

-(void) createTable:(NSString*)sql dataBaseName:(NSString*) dataName;
/**
*  运行SQL语句。主要完毕添加、改动、删除
*  sql:运行的SQL语句
*  params:SQL语句中的參数
*  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语句中的參数
*  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]; 这个文件夹。文件能够直接用SQLiteManager软件打开，也能够在firefox浏览器中安装sqlitemanager插件打开，例如以下图

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

/*
*  获取沙盒文件夹
*  name:追加的文件夹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语句中的參数
*  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);
//绑定參数
for (int i=0; i<params.count; i++) {
NSString *param=[params objectAtIndex:i];
sqlite3_bind_text(stmt, i+1, [param UTF8String], -1, NULL);
}

//运行查询语句
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;
}
/**
*  运行SQL语句。主要完毕添加、改动、删除
*  sql:运行的SQL语句
*  params:SQL语句中的參数
*  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);
//绑定參数
for (int i=0; i<params.count; i++) {
NSString *parm=[params objectAtIndex:i];
sqlite3_bind_text(stmt, i+1, [parm UTF8String], -1, NULL);
}
//运行SQL
result=sqlite3_step(stmt);
if (result==SQLITE_ERROR || result==SQLITE_MISUSE) {
NSLog(@"运行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(@"运行成功。");
return YES;
}

/**
*  创建一个表
*  sql:运行的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;
//运行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];

//加入数据
NSString *insertTable=@"insert into zhaochao (username,userPasswd) values (?

,?)";
NSArray  *insertParmas=@[@"acasdfaa",@"bb"];
// [db execSql:insertTable parmas:insertParmas dataBaseName:@"zhaochao.sqlite"];

//改动数据
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);
}