一.在iOS中使用Sqlite的条件：
<1>.导入FMDB第三方库。
<2>.导入libsqlite3.tbd系统库。
二.使用步骤：
<1>.FMDB导入一个封装的多线程类(LosDatabaseHelper.h)和FMDB.h
在LosDatabaseHelper类中的代码
在.h文件中
#import#import "FMDatabaseQueue.h"
@interface LosDatabaseHelper : NSObject
+(FMDatabaseQueue *)getSharedDatabaseQueue;
@end
在.m文件中
#import "LosDatabaseHelper.h"
@implementation LosDatabaseHelper{
FMDatabaseQueue *queue;
}
+(FMDatabaseQueue *)getSharedDatabaseQueue{
static FMDatabaseQueue *my_FMDatabaseQueue=nil;
if (!my_FMDatabaseQueue) {
NSString *path = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"db_CMBCC.sqlite"];
my_FMDatabaseQueue = [FMDatabaseQueue databaseQueueWithPath:path];
}
return my_FMDatabaseQueue;
}
@end
<2>.创建一个FMDatabaseQueue多线程管理类的对象，调用对象方法，对数据库进行判断是否存在，若存在则直接进行增、删、改、查操作，若不存在则创建数据库，然后进行增、删、改、查操作。
FMDatabaseQueue *queue = [LosDatabaseHelper getSharedDatabaseQueue];
[queue inDatabase:^(FMDatabase *db) {
if ([db open]) {
[db setShouldCacheStatements:YES];
if (![db tableExists:@"userinfo"]) {
[db executeUpdate:@"CREATE TABLE userinfo(userinfo_id INTEGER PRIMARY KEY, name TEXT, avatar TEXT, email TEXT, phone TEXT, token TEXT, sex INTEGER, height INTEGER, weight INTEGER, goal INTEGER, max_heart_rate INTEGER, birthday INTEGER)"];
NSLog(@"用户信息数据库创建完成!");
}
NSString *sex_Str1 = [NSString stringWithFormat:@"%ld", (long)[userinfo.sex intValue]];
NSString *height_Str1 = [NSString stringWithFormat:@"%ld", (long)[userinfo.height integerValue]];
NSString *weight_Str1 = [NSString stringWithFormat:@"%ld", (long)[userinfo.weight integerValue]];
NSString *goal_Str1 = [NSString stringWithFormat:@"%ld", (long)[userinfo.goal integerValue]];
NSString *max_heart_rate_Str1 = [NSString stringWithFormat:@"%ld", (long)[userinfo.max_heart_rate integerValue]];
NSString *birthday_Str1 = [NSString stringWithFormat:@"%ld", (long)[userinfo.birthday integerValue]];
[db executeUpdate:@"insert into userinfo(name, avatar, email, phone, token, sex, height, weight, goal, max_heart_rate, birthday) values(?,?,?,?,?,?,?,?,?,?,?)", userinfo.name, userinfo.avatar, userinfo.email, userinfo.phone, userinfo.token, sex_Str1, height_Str1, weight_Str1, goal_Str1, max_heart_rate_Str1, birthday_Str1];
}
else{
NSLog(@"打开数据库失败!");
}
}];
<3>.一下是数据库语句
创建数据库: CREATE TABLE 创建的数据库名
[db executeUpdate:@"CREATE TABLE userinfo(userinfo_id INTEGER PRIMARY KEY, name TEXT, avatar TEXT, email TEXT, phone TEXT, token TEXT, sex INTEGER, height INTEGER, weight INTEGER, goal INTEGER, max_heart_rate INTEGER, birthday INTEGER)"];
注释：CREATE TABLE userinfo创建数据库语句
INTEGER,TEXT为变量类型，email,phone,token为变量字段。
增：insert into 数据库名(字段名) values(?) 一个字段名对应一个?
[db executeUpdate:@"insert into health(calorie, date, distance, end_time, is_sync, start_time, steps) values(?,?,?,?,?,?,?)", calorie_Str1, health.date, distance_Str1, health.end_time, is_sync_Str1, health.start_time, steps_Str1];
删:delete from 数据库名 where 后面加条件
[db executeUpdate:@"delete from health"];
改：update 数据库名 set 字段名 = ?，字段名 = ? where 加条件 后面跟着字段名的真实值。
[db executeUpdate:@"update health set calorie = ?, distance = ?, end_time = ?, is_sync = ?, steps = ? where date = ? and start_time = ?", calorie_Str, distance_Str, health.end_time, is_sync_Str, steps_Str, health.date, health.start_time];
查: select 字段名(*代表查询全部) 数据库名 where 条件
[db executeQuery:@"select * from health where is_sync = 0"]
注释: 增删改都是用update，查是用query
