//打开数据库 如果没有就创建
NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject]stringByAppendingPathComponent:@"data.sqlite"];
//创建数据库的队列
FMDatabaseQueue *dataBaseQ = [FMDatabaseQueue databaseQueueWithPath:path];
self.dataBaseQ = dataBaseQ;
[dataBaseQ inDatabase:^(FMDatabase *db) {
BOOL success = [db open];
if (success) {
NSLog(@"数据库创建成功!");
//2.创建表
NSString *str = @"CREATE TABLE IF NOT EXISTS t_student (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, score REAL NOT NULL)";
if ([db executeUpdate:str]) {
NSLog(@"表创建成功!");
}else{
NSLog(@"创建表失败!");
}
}else{
NSLog(@"数据库创建失败!");
}
}];
[self.dataBaseQ inDatabase:^(FMDatabase *db) {
//3.增加 数据 (100条 数据随机)
for (int i = 0; i <100; i++) {
NSString *strName = [NSString stringWithFormat:@"8mingyeuxin-%d",i];
NSString *sqlStr = [NSString stringWithFormat:@"INSERT INTO t_student (name ,score)VALUES('%@',%.02f)",strName,arc4random_uniform(1000)/10.0];
//执行 //非查询语句 执行的方法
BOOL success = [db executeUpdate:sqlStr];
if (success) {
NSLog(@"添加成功!");
}else{
NSLog(@"添加失败!");
}
}
}];
[self.dataBaseQ inDatabase:^(FMDatabase *db) {
NSString *strSql = @"SELECT * FROM t_student WHERE score > 60.0 ORDER BY score DESC;";
//查询语句 执行的方法
FMResultSet *set = [db executeQuery:strSql];
while ([set next]) {
//name
//NSString *name = [set stringForColumnIndex:1];
NSString *name = [set stringForColumn:@"name"];
//score
CGFloat score = [set doubleForColumn:@"score"];
NSLog(@"name = %@ score = %f",name,score);
}
}];