iOS开发——高级篇——FMDB 数据库简单使用

 #import <Foundation/Foundation.h>

 @interface UserDB : NSObject

 // 把userDB设计成一个单例类
 + (id)shareInstance;

 // 创建用户表
 - (void)createTable;

 // 添加用户
 - (void)addData:(NSArray *)dataArray;

 // 查询用户
 - (NSArray *)findDatas;

 // 删除一行数据
 - (void)deleteRowData:(NSArray *)array;

 // 清空表中的数据：
 - (void)clearTableData;

 // 更新数据
 - (void)executeUpdate:(NSArray *)array;

 @end

.h文件

 #import "UserDB.h"
 #import <FMDB.h>

 #define dataBasePath [[(NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES)) lastObject]stringByAppendingPathComponent:dataBaseName]
 #define dataBaseName @"GuoBIn.sqlite"

 // 把userDB设计成一个单例类
 static UserDB *instnce;

 @implementation UserDB

 // 把userDB设计成一个单例类
 + (id)shareInstance
 {
     if (instnce == nil) {
         instnce = [[[self class] alloc] init];
     }
     return instnce;
 }

 // 创建用户表
 - (void)createTable
 {
     // 文件路径
     NSString *filePath = [NSHomeDirectory() stringByAppendingFormat:@"/Documents/%@",dataBaseName];
     NSLog(@"文件路径 == %@",filePath);

     FMDatabase *db = [FMDatabase databaseWithPath:dataBasePath];

     if ([db open]) {
         if (![db tableExists:@"user"]) {
             if ([db executeUpdate:@"CREATE TABLE user (Serial text primary key,dataText text)"]) {
                 NSLog(@"创建表成功");
             }else{
                 NSLog(@"创建表失败");
             }
         } else {
             NSLog(@"表已经存在");
         }
     } else{
         NSLog(@"打开表失败");
     }
     [db close];

 }

 // 添加用户
 - (void)addData:(NSArray *)dataArray
 {
     NSString *serial   = [dataArray objectAtIndex:];
     NSString *dataText = [dataArray objectAtIndex:];

     FMDatabase *db = [FMDatabase databaseWithPath:dataBasePath];
     if ([db open]) {
     // 插入数据
     [db executeUpdate:@"insert into user (Serial,DataText) values(?,?)",serial,dataText,nil];
     }
     [db close];
 }

 // 查询用户
 - (NSArray *)findDatas
 {
     NSMutableArray *users = [NSMutableArray array];
     FMDatabase *db = [FMDatabase databaseWithPath:dataBasePath];
     if ([db open]) {
         // 获取所有数据
         FMResultSet *rs = [db executeQuery:@"SELECT * FROM user"];
         while ([rs next]) {
             NSString *serial = [rs stringForColumn:@"Serial"];
             NSString *dataText = [rs stringForColumn:@"DataText"];

             [users addObject:@[serial,dataText]];
         }
         [rs close];
     }
     [db close];
     return users;
 }

 - (void)deleteRowData:(NSArray *)array
 {
     NSString *serial = [array objectAtIndex:];
     NSString *dataText = [array objectAtIndex:];

     FMDatabase *db = [FMDatabase databaseWithPath:dataBasePath];
     if ([db open]) {
         // 删除某个数据
         BOOL rs = [db executeUpdate:@"DELETE FROM user WHERE Serial = ? and DataText = ?",serial,dataText];

         if (rs) {
             NSLog(@"删除成功");
         } else {
             NSLog(@"删除失败");
         }
     }
     [db close];
 }

 // 清空表中的数据：
 - (void)clearTableData
 {
     FMDatabase *db = [FMDatabase databaseWithPath:dataBasePath];
     if ([db open]) {
         // 清除全部数据
         [db executeUpdate:@"DELETE FROM user"];
     }
     [db close];
 }

 // 更新数据
 - (void)executeUpdate:(NSArray *)array
 {
     NSString *serial = [array objectAtIndex:];
     NSString *dataText = [array objectAtIndex:];

     FMDatabase *db = [FMDatabase databaseWithPath:dataBasePath];
     if ([db open]) {
         [db executeUpdate:@"UPDATE user SET DataText = ? WHERE Serial = ?",dataText,serial];
     }
     [db close];

 }

 @end

.m文件