基于FMDB的二次封装库,实现了大多数基础的sqlite数据库操作,使用简单,不会sqlite语句也可以轻松使用sqlite实现本地数据存储
pod 'WHDB', '~> 0.0.6'
Run pod install or pod update.
Import <WHDB.h>.
//使用WHObject或WHQuery 必须初始化数据库
NSError *error = nil;
NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *path = [doc stringByAppendingPathComponent:@"Test.sqlite"];
if (![[NSFileManager defaultManager] fileExistsAtPath:path]) {
//根据名称创建数据库文件
[[WHDBManager shareManager] createDBFileAndHoldWithDBName:@"Test" error:&error];
}else {
//也可以建立已经存在的数据库文件连接
[[WHDBManager shareManager] createExistingDBConnectionAndHoldWithPath:path error:&error];
//删除表内所有数据
[WHObject deleteAllInTable:@"student" error:&error];
//删除表
[WHObject deleteTable:@"student" error:&error];
//删除表内所有数据
[WHObject deleteAllInTable:@"score" error:&error];
//删除表
[WHObject deleteTable:@"score" error:&error];
}
if (error) {
NSLog(@"CreateBD error === %@", error);
return;
}
[WHDBManager shareManager].defaultKeysEnable = YES;
[[WHDBManager shareManager] createTableWithTableName:@"student"
forKeyTypes:@{@"student_id":WHDB_VALUETYPE_INTEGER,
@"name":WHDB_VALUETYPE_STRING,
@"age":WHDB_VALUETYPE_INTEGER,
@"height":WHDB_VALUETYPE_FLOAT,
@"boy":WHDB_VALUETYPE_BOOL}
error:&error];
[[WHDBManager shareManager] createTableWithTableName:@"score"
forKeyTypes:@{@"name":WHDB_VALUETYPE_STRING,
@"studentId":WHDB_VALUETYPE_INTEGER,
@"test_score":WHDB_VALUETYPE_INTEGER}
error:&error];
if (error) {
NSLog(@"Create table error === %@", error);
return;
}
//写入student
NSMutableArray *stus = [NSMutableArray array];
for (NSInteger i = 0; i < 1000; i++) {
WHObject *obj = [WHObject objectWithTableName:@"student"];
[obj setObject:[NSString stringWithFormat:@"st%ld", i] forKey:@"name"];
[obj setObject:@(i+1) forKey:@"student_id"];
[obj setObject:[NSString stringWithFormat:@"%d", arc4random()%8 + 10] forKey:@"age"];
[obj setObject:[NSString stringWithFormat:@"%.2lf", arc4random()%100 + 80.5] forKey:@"height"];
[obj setObject:i%2==0?@(YES):@(NO) forKey:@"boy"];
[stus addObject:obj];
}
[WHObject saveAll:stus inTable:@"student" error:&error];
if (error) {
NSLog(@"student save data error === %@", error);
return;
}
//查询
WHQuery *query = [WHQuery queryWithTableName:@"student"];
[query whereKey:@"age" equalTo:@(15)];
//[query whereKey:@"age" greaterThan:@(16)];
[query setLimit:100];
NSArray *results = [query findObjects:&error];
if (error) {
NSLog(@"query error === %@", error);
return;
}else {
NSLog(@"results == %@", results);
}
//写入score
NSMutableArray *scores = [NSMutableArray array];
for (NSInteger i = 0; i < results.count; i++) {
WHObject *student = results[i];
WHObject *obj = [WHObject objectWithTableName:@"score"];
[obj setObject:[student objectForKey:@"name"] forKey:@"name"];
[obj setObject:[student objectForKey:@"student_id"] forKey:@"studentId"];
[obj setObject:@(arc4random()%50 + 51) forKey:@"test_score"];
[scores addObject:obj];
}
[WHObject saveAll:scores inTable:@"score" error:&error];
if (error) {
NSLog(@"score save data error === %@", error);
return;
}
//给表添加字段
[WHObject addColumnWithKeyType:@{@"average":WHDB_VALUETYPE_INTEGER} inTable:@"student" error:&error];
if (error) {
NSLog(@"add column average to student error === %@", error);
return;
}
NSMutableArray *updateArray = [NSMutableArray array];
for (NSInteger i = 0; i < results.count; i++) {
WHObject *student = results[i];
[student setObject:@(arc4random()%60 + 40) forKey:@"average"];
[updateArray addObject:student];
}
[WHObject updateAll:updateArray conditions:nil inTable:@"student" error:&error];
if (error) {
NSLog(@"update student with average error === %@", error);
return;
}
//查询刚刚添加的average字段
WHQuery *averageQuery = [WHQuery queryWithTableName:@"student"];
[averageQuery whereKeyNotNull:@"average"];
results = [averageQuery findObjects:&error];
if (error) {
NSLog(@"query student with average error === %@", error);
}else {
NSLog(@"query student with average succeed, results === %@", results);
}
//关联查询
WHQuery *query2 = [WHQuery queryWithTableName:@"student"];
[query2 whereKey:@"age" equalTo:@(15)];
//student表中student_id 与 score表中 studentId 相等的结果
[query2 whereKey:@"student_id" equalToRelationalKey:@"studentId" inRelationalTable:@"score"];
results = [query2 findObjects:&error];
if (error) {
NSLog(@"query error === %@", error);
return;
}else {
NSLog(@"results == %@", results);
}