【iOS】FMDB封装，查询自动mapping

sqlite几乎所有的App都会用到，但是系统自带的sqlite API是用C语言写的，非常不友好，用起来非常不便，通常我们使用第三方封装好的工具，例如：FMDB（https://github.com/ccgus/fmdb）

FMDB的提供了一种更简单，方便的API，并且还提供了线程安全的队列FMDatabaseQueue用于数据库的读写，关于FMDB的使用，参见github上的描述

在使用FMDB查询表的时候的时候我们一般用下面方式

　　1、定义一个数据模型PersonModel

@interface PersonModel : NSObject

@property (nonatomic, assign) NSInteger peopleId;

@property (nonatomic, copy) NSString *name;

@property (nonatomic, copy) NSString *gender;

@property (nonatomic, assign) float weight;

@property (nonatomic, assign) double height;

@property (nonatomic, assign) short age;

@property (nonatomic, assign) long score;

@property (nonatomic, strong) NSDate *createTime;

@property (nonatomic, assign) BOOL married;

@property (nonatomic, strong) NSData *desc;

@end

　　2、插入数据

    NSString *sql = @"insert into People(name, gender, weight, height, age, score, createTime, married, desc) values(?,?,?,?,?,?,?,?,?)";

    NSString *text = @"dataValue";

    NSData *data = [text dataUsingEncoding:NSUTF8StringEncoding];

    NSArray *param = @[@"bomo", @"male", @, @175l, @, @, [NSDate date], @NO, data];

    [_queue inDatabase:^(FMDatabase *db) {

        [db executeUpdate:sql withArgumentsInArray:param];

    }];

　　3、查询

    NSString *sql = @"select * from People";

    __block NSMutableArray *people = [NSMutableArray array];

    [_queue inDatabase:^(FMDatabase *db) {

        FMResultSet *rs = [db executeQuery:sql];

        while ([rs next]) {

            person.name = [rs stringForColumn:@"name"];

            person.gender = [rs stringForColumn:@"gender"];

            person.height = [rs doubleForColumn:@"height"];

            person.score = [rs longForColumn:@"score"];

            person.createTime = [rs dateForColumn:@"createTime"];

            person.married = [rs boolForColumn:@"married"];

            person.desc = [rs dataForColumn:@"desc"];

            //下面几种方式读取数据会导致数据类型不一致的问题

            //person.peopleId = [rs intForColumn:@"peopleId"];

            //person.age = [rs intForColumn:@"age"];

            //person.weight = [rs doubleForColumn:@"weight"];

            [people addObject:person];

        }

        [rs close];

    }];

这里的查询方法需要对每一个属性进行读取和赋值，并且可能有数据类型不一致的问题，比如读取出来的int 赋值给NSInteger 类型，double类型赋值给float类型，下面我们对查询方法进行改造，让其变得更通用，可以自动映射查询结果到Model，并提供数据库列名到属性名之间的映射

　　1、定义映射协议

#import <Foundation/Foundation.h>

//实现数据库列名到model属性名的映射

@protocol ColumnPropertyMappingDelegate <NSObject>

@required

- (NSDictionary *)columnPropertyMapping;

@end

　　2、修改PersonModel模型

#import <Foundation/Foundation.h>

#import "ColumnPropertyMappingDelegate.h"

@interface PersonModel : NSObject <ColumnPropertyMappingDelegate>

@property (nonatomic, assign) NSInteger peopleId;

@property (nonatomic, copy) NSString *name;

@property (nonatomic, copy) NSString *gender;

@property (nonatomic, assign) float weight;

@property (nonatomic, assign) double height;

@property (nonatomic, assign) short age;

@property (nonatomic, assign) long score;

@property (nonatomic, strong) NSDate *createTime;

@property (nonatomic, assign) BOOL married;

@property (nonatomic, strong) NSData *desc;

@end

@implementation PersonModel

- (NSDictionary *)columnPropertyMapping

{

    return @{@"id": @"peopleId",

             @"str1": @"name",

             @"str2": @"gender",

             @"float1": @"weight",

             @"double1": @"height",

             @"short1": @"age",

             @"long1": @"score",

             @"date1": @"createTime",

             @"bool1": @"married",

             @"data1": @"desc"};

}

@end

　　数据库的列名如果与Model的属性名不一致，可以通过改映射函数进行配置

　　3、查询函数，关键方法

/**

 *  执行查询操作，自定构造models集合

 *

 *  @param sql        sql语句

 *  @param args       sql参数

 *  @param modelClass 结果集model类型

 *  @param block      对model执行自定义操作

 *

 *  @return 查询结果集

 */

- (NSArray *)executeQuery:(NSString *)sql withArgumentsInArray:(NSArray *)args modelClass:(Class)modelClass performBlock:(void (^)(id model, FMResultSet *rs))block

{

    __block NSMutableArray *models = [NSMutableArray array];

    [_queue inDatabase:^(FMDatabase *db) {

        NSDictionary *mapping = nil;

        FMResultSet *rs = [db executeQuery:sql withArgumentsInArray:args];

        while ([rs next]) {

            id model = [[modelClass alloc] init];

            if(!mapping && [model conformsToProtocol:@protocol(ColumnPropertyMappingDelegate)]) {

                //实现了列-属性转换协议

                mapping = [model columnPropertyMapping];

            }

            for (int i = ; i < [rs columnCount]; i++) {

                //列名

                NSString *columnName = [rs columnNameForIndex:i];

                //进行数据库列名到model之间的映射转换，拿到属性名

                NSString *propertyName;

                if(mapping) {

                    propertyName = mapping[columnName];

                    if (propertyName == nil) {

                        //如果映射未定义，则视为相同

                        propertyName = columnName;

                    }

                } else {

                    propertyName = columnName;

                }

                objc_property_t objProperty = class_getProperty(modelClass, propertyName.UTF8String);

                //如果属性不存在，则不操作

                if (objProperty) {

                    if(![rs columnIndexIsNull:i]) {

                        [self setProperty:model value:rs columnName:columnName propertyName:propertyName property:objProperty];

                    }

                }

                NSAssert(![propertyName isEqualToString:@"description"], @"description为自带方法，不能对description进行赋值，请使用其他属性名或请ColumnPropertyMappingDelegate进行映射");

            }

            //执行自定义操作

            if (block) {

                block(model, rs);

            }

            [models addObject:model];

        }

        [rs close];

    }];

    return models;

}

/**

 *  进行属性赋值

 */

- (void)setProperty:(id)model value:(FMResultSet *)rs columnName:(NSString *)columnName propertyName:(NSString *)propertyName property:(objc_property_t)property

{

    //    @"f":@"float",

    //    @"i":@"int",

    //    @"d":@"double",

    //    @"l":@"long",

    //    @"c":@"BOOL",

    //    @"s":@"short",

    //    @"q":@"long",

    //    @"I":@"NSInteger",

    //    @"Q":@"NSUInteger",

    //    @"B":@"BOOL",

    NSString *firstType = [[[[NSString stringWithUTF8String:property_getAttributes(property)] componentsSeparatedByString:@","] firstObject] substringFromIndex:];

    if ([firstType isEqualToString:@"f"]) {

        NSNumber *number = [rs objectForColumnName:columnName];

        [model setValue:@(number.floatValue) forKey:propertyName];

    } else if([firstType isEqualToString:@"i"]){

        NSNumber *number = [rs objectForColumnName:columnName];

        [model setValue:@(number.intValue) forKey:propertyName];

    } else if([firstType isEqualToString:@"d"]){

        [model setValue:[rs objectForColumnName:columnName] forKey:propertyName];

    } else if([firstType isEqualToString:@"l"] || [firstType isEqualToString:@"q"]){

        [model setValue:[rs objectForColumnName:columnName] forKey:propertyName];

    } else if([firstType isEqualToString:@"c"] || [firstType isEqualToString:@"B"]){

        NSNumber *number = [rs objectForColumnName:columnName];

        [model setValue:@(number.boolValue) forKey:propertyName];

    } else if([firstType isEqualToString:@"s"]){

        NSNumber *number = [rs objectForColumnName:columnName];

        [model setValue:@(number.shortValue) forKey:propertyName];

    } else if([firstType isEqualToString:@"I"]){

        NSNumber *number = [rs objectForColumnName:columnName];

        [model setValue:@(number.integerValue) forKey:propertyName];

    } else if([firstType isEqualToString:@"Q"]){

        NSNumber *number = [rs objectForColumnName:columnName];

        [model setValue:@(number.unsignedIntegerValue) forKey:propertyName];

    } else if([firstType isEqualToString:@"@\"NSData\""]){

        NSData *value = [rs dataForColumn:columnName];

        [model setValue:value forKey:propertyName];

    } else if([firstType isEqualToString:@"@\"NSDate\""]){

        NSDate *value = [rs dateForColumn:columnName];

        [model setValue:value forKey:propertyName];

    } else if([firstType isEqualToString:@"@\"NSString\""]){

        NSString *value = [rs stringForColumn:columnName];

        [model setValue:value forKey:propertyName];

    } else {

        [model setValue:[rs objectForColumnName:columnName] forKey:propertyName];

    }

}

　　我们把数据库的查询和更新方法封装成DbService

#import <Foundation/Foundation.h>

@class FMResultSet;

@interface DbService : NSObject

- (instancetype)initWithPath:(NSString *)path;

/**

 *  查询第一行第一列的数据

 */

- (id)executeScalar:(NSString *)sql param:(NSArray *)param;

/**

 *  查询行数

 */

- (NSInteger)rowCount:(NSString *)tableName;

/**

 *  更新数据

 */

- (BOOL)executeUpdate:(NSString *)sql param:(NSArray *)param;

#pragma mark - 查询操作自动构建Model

/**

 *  执行查询操作，自定构造models集合

 *

 *  @param sql        sql语句

 *  @param args       sql参数

 *  @param modelClass 结果集model类型

 *

 *  @return 查询结果集

 */

- (NSArray *)executeQuery:(NSString *)sql withArgumentsInArray:(NSArray *)args modelClass:(Class)modelClass;

/**

 *  执行查询操作，自定构造models集合

 *

 *  @param sql        sql语句

 *  @param args       sql参数

 *  @param modelClass 结果集model类型

 *  @param block      对model执行自定义操作

 *

 *  @return 查询结果集

 */

- (NSArray *)executeQuery:(NSString *)sql withArgumentsInArray:(NSArray *)args modelClass:(Class)modelClass performBlock:(void (^)(id model, FMResultSet *rs))block;

/**

 *  查询结果集取得model集合

 *

 *  @param rs         数据库查询结果集

 *  @param modelClass 结果集model类型

 *

 *  @return 查询结果集

 */

- (NSArray *)resultForModels:(FMResultSet *)rs modelClass:(Class)modelClass;

/**

 *  查询结果集取得model集合

 *

 *  @param rs         数据库查询结果集

 *  @param modelClass 结果集model类型

 *  @param block      对model执行自定义操作

 *

 *  @return 查询结果集

 */

- (NSArray *)resultForModels:(FMResultSet *)rs modelClass:(Class)modelClass performBlock:(void (^)(id model, FMResultSet *rs))block;

@end

#import "DbService.h"

#import <objc/runtime.h>

#import "FMDB.h"

#import "ColumnPropertyMappingDelegate.h"

#import "PersonModel.h"

@interface DbService ()

{

    FMDatabaseQueue *_queue;

}

@end

@implementation DbService

- (instancetype)initWithPath:(NSString *)path

{

    if (self = [super init]) {

        _queue = [FMDatabaseQueue databaseQueueWithPath:path];

    }

    return self;

}

- (BOOL)executeUpdate:(NSString *)sql param:(NSArray *)param

{

    __block BOOL result = NO;

    [_queue inDatabase:^(FMDatabase *db) {

        if (param && param.count > ) {

            result = [db executeUpdate:sql withArgumentsInArray:param];

        } else {

            result = [db executeUpdate:sql];

        }

    }];

    return result;

}

- (id)executeScalar:(NSString *)sql param:(NSArray *)param

{

    __block id result;

    [_queue inDatabase:^(FMDatabase *db) {

        FMResultSet *rs = [db executeQuery:sql withArgumentsInArray:param];

        if ([rs next]) {

            result = rs[];

        } else {

            result = ;

        }

    }];

    return result;

}

- (NSInteger)rowCount:(NSString *)tableName

{

    NSNumber *number = (NSNumber *)[self executeScalar:[NSString stringWithFormat:@"SELECT COUNT(*) FROM %@", tableName] param:nil];

    return [number longValue];

}

#pragma mark -

#pragma mark -- 自动创建model查询方法

- (NSArray *)executeQuery:(NSString *)sql withArgumentsInArray:(NSArray *)args modelClass:(Class)modelClass

{

    return [self executeQuery:sql withArgumentsInArray:args modelClass:modelClass performBlock:nil];

}

- (NSArray *)executeQuery:(NSString *)sql withArgumentsInArray:(NSArray *)args modelClass:(Class)modelClass performBlock:(void (^)(id model, FMResultSet *rs))block

{

    __block NSMutableArray *models = [NSMutableArray array];

    [_queue inDatabase:^(FMDatabase *db) {

        NSDictionary *mapping = nil;

        FMResultSet *rs = [db executeQuery:sql withArgumentsInArray:args];

        while ([rs next]) {

            id model = [[modelClass alloc] init];

            if(!mapping && [model conformsToProtocol:@protocol(ColumnPropertyMappingDelegate)]) {

                //实现了列-属性转换协议

                mapping = [model columnPropertyMapping];

            }

            for (int i = ; i < [rs columnCount]; i++) {

                //列名

                NSString *columnName = [rs columnNameForIndex:i];

                //进行数据库列名到model之间的映射转换，拿到属性名

                NSString *propertyName;

                if(mapping) {

                    propertyName = mapping[columnName];

                    if (propertyName == nil) {

                        //如果映射未定义，则视为相同

                        propertyName = columnName;

                    }

                } else {

                    propertyName = columnName;

                }

                objc_property_t objProperty = class_getProperty(modelClass, propertyName.UTF8String);

                //如果属性不存在，则不操作

                if (objProperty) {

                    if(![rs columnIndexIsNull:i]) {

                        [self setProperty:model value:rs columnName:columnName propertyName:propertyName property:objProperty];

                    }

                }

                NSAssert(![propertyName isEqualToString:@"description"], @"description为自带方法，不能对description进行赋值，请使用其他属性名或请ColumnPropertyMappingDelegate进行映射");

            }

            //执行自定义操作

            if (block) {

                block(model, rs);

            }

            [models addObject:model];

        }

        [rs close];

    }];

    return models;

}

/**

 *  解析结果集（models）

 */

- (NSArray *)resultForModels:(FMResultSet *)rs modelClass:(Class)modelClass

{

    return [self resultForModels:rs modelClass:modelClass performBlock:nil];

}

- (NSArray *)resultForModels:(FMResultSet *)rs modelClass:(Class)modelClass performBlock:(void (^)(id model, FMResultSet *rs))block;

{

    NSDictionary *mapping = nil;

    NSMutableArray *models = [NSMutableArray array];

    while ([rs next]) {

        id model = [[modelClass alloc] init];

        if(!mapping && [model conformsToProtocol:@protocol(ColumnPropertyMappingDelegate)]) {

            //实现了列-属性转换协议

            mapping = [model columnPropertyMapping];

        }

        for (int i = ; i < [rs columnCount]; i++) {

            //列名

            NSString *columnName = [rs columnNameForIndex:i];

            //进行数据库列名到model之间的映射转换，拿到属性名

            NSString *propertyName;

            if(mapping) {

                propertyName = mapping[columnName];

                if (propertyName == nil) {

                    propertyName = columnName;

                }

            } else {

                propertyName = columnName;

            }

            objc_property_t objProperty = class_getProperty(modelClass, propertyName.UTF8String);

            //如果属性不存在，则不操作

            if (objProperty) {

                if(![rs columnIndexIsNull:i]) {

                    [self setProperty:model value:rs columnName:columnName propertyName:propertyName property:objProperty];

                }

            }

            NSAssert(![propertyName isEqualToString:@"description"], @"description为自带方法，不能对description进行赋值，请使用其他属性名或请ColumnPropertyMappingDelegate进行映射");

        }

        //执行自定义操作

        if (block) {

            block(model, rs);

        }

        [models addObject:model];

    }

    [rs close];

    return models;

}

/**

 *  进行属性赋值

 */

- (void)setProperty:(id)model value:(FMResultSet *)rs columnName:(NSString *)columnName propertyName:(NSString *)propertyName property:(objc_property_t)property

{

    //    @"f":@"float",

    //    @"i":@"int",

    //    @"d":@"double",

    //    @"l":@"long",

    //    @"c":@"BOOL",

    //    @"s":@"short",

    //    @"q":@"long",

    //    @"I":@"NSInteger",

    //    @"Q":@"NSUInteger",

    //    @"B":@"BOOL",

    NSString *firstType = [[[[NSString stringWithUTF8String:property_getAttributes(property)] componentsSeparatedByString:@","] firstObject] substringFromIndex:];

    if ([firstType isEqualToString:@"f"]) {

        NSNumber *number = [rs objectForColumnName:columnName];

        [model setValue:@(number.floatValue) forKey:propertyName];

    } else if([firstType isEqualToString:@"i"]){

        NSNumber *number = [rs objectForColumnName:columnName];

        [model setValue:@(number.intValue) forKey:propertyName];

    } else if([firstType isEqualToString:@"d"]){

        [model setValue:[rs objectForColumnName:columnName] forKey:propertyName];

    } else if([firstType isEqualToString:@"l"] || [firstType isEqualToString:@"q"]){

        [model setValue:[rs objectForColumnName:columnName] forKey:propertyName];

    } else if([firstType isEqualToString:@"c"] || [firstType isEqualToString:@"B"]){

        NSNumber *number = [rs objectForColumnName:columnName];

        [model setValue:@(number.boolValue) forKey:propertyName];

    } else if([firstType isEqualToString:@"s"]){

        NSNumber *number = [rs objectForColumnName:columnName];

        [model setValue:@(number.shortValue) forKey:propertyName];

    } else if([firstType isEqualToString:@"I"]){

        NSNumber *number = [rs objectForColumnName:columnName];

        [model setValue:@(number.integerValue) forKey:propertyName];

    } else if([firstType isEqualToString:@"Q"]){

        NSNumber *number = [rs objectForColumnName:columnName];

        [model setValue:@(number.unsignedIntegerValue) forKey:propertyName];

    } else if([firstType isEqualToString:@"@\"NSData\""]){

        NSData *value = [rs dataForColumn:columnName];

        [model setValue:value forKey:propertyName];

    } else if([firstType isEqualToString:@"@\"NSDate\""]){

        NSDate *value = [rs dateForColumn:columnName];

        [model setValue:value forKey:propertyName];

    } else if([firstType isEqualToString:@"@\"NSString\""]){

        NSString *value = [rs stringForColumn:columnName];

        [model setValue:value forKey:propertyName];

    } else {

        [model setValue:[rs objectForColumnName:columnName] forKey:propertyName];

    }

}

@end

PersonModel.m

　　创建一个PeopleService演示一下

#import <Foundation/Foundation.h>

@interface PeopleService : NSObject

+ (instancetype)shareInstance;

- (void)createTable;

- (void)insertOnePerson;

- (NSArray *)query;

@end

PeopleService.h

#import "PersonModel.h"

#import "PeopleService.h"

#import "DbService.h"

@interface PeopleService ()

{

    DbService *_dbService;

}

@end

@implementation PeopleService

+ (instancetype)shareInstance

{

    static id instance = nil;

    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        instance = [[self alloc] init];

    });

    return instance;

}

- (instancetype)init

{

    if (self = [super init]) {

        NSString *dbName = @"people.db";

        NSString *directory = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];

        NSString *dbPath = [directory stringByAppendingPathComponent:dbName];

        _dbService = [[DbService alloc] initWithPath:dbPath];

    }

    return self;

}

- (void)createTable

{

    NSString *sql = @"CREATE TABLE People (                     \

                        id INTEGER PRIMARY KEY AUTOINCREMENT,   \

                        str1 TEXT,                              \

                        str2 TEXT,                              \

                        float1 REAL,                            \

                        double1 INTEGER,                        \

                        short1 REAL,                            \

                        long1 REAL,                             \

                        date1 TEXT,                             \

                        bool1 INTEGER,                          \

                        data1 BLOB                              \

                        )";

    [_dbService executeUpdate:sql param:nil];

}

- (void)insertOnePerson

{

    NSString *sql = @"insert into People(str1, str2, float1, double1, short1, long1, date1, bool1, data1) values(?,?,?,?,?,?,?,?,?)";

    NSString *text = @"dataValue";

    NSData *data = [text dataUsingEncoding:NSUTF8StringEncoding];

    NSArray *param = @[@"bomo", @"male", @, @175l, @, @, [NSDate date], @NO, data];

    [_dbService executeUpdate:sql param:param];

}

- (NSArray *)query

{

    return [_dbService executeQuery:@"select * from People" withArgumentsInArray:nil modelClass:[PersonModel class]];

}

@end

PeopleService.m

　　测试

    [[PeopleService shareInstance] createTable];

    [[PeopleService shareInstance] insertOnePerson];

    NSArray *people = [[PeopleService shareInstance] query];

    for (PersonModel *person in people) {

        NSLog(@"name = %@, age = %d", person.name, person.age);

    }

　　我们看一下数据库的表结构

　　查询操作只需要一行代码，其他的都交给DbService，减少代码量，减少人为错误，由于个人水平有限，如有疏漏或问题，欢迎回复，如果大家有更好的方式，可以一起讨论

　　Demo：http://files.cnblogs.com/files/bomo/FmdbDemo.zip

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