FMDB的简单使用
创建5个UITextField用来输入联系人姓名，电话，年龄，邮箱，地址。自己创建。
首先导入FMDB，再添加libsqlite3.tbd,在修改添加修改-fno-objc-arc，如下图所示
环境配置好了之后，开始正式的操作。
创建数据库和数据表，并向其中插入数据
+(BOOL)insertDataIntoSql:(LHCDataModel *)model
{
NSString *dbString = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/User.db"];
FMDatabase *database = [[FMDatabase alloc] initWithPath:dbString];
[database open];
//创建表格的SQL语句//primary key不能重复//autoincrement自增长
NSString *createTableSql = @"create table if not exists MyFriends(id integer primary key autoincrement, name varchar(256), phone varchar(256), age varchar(256), email varchar(256),address varchar(256))";
//创建数据困中得表格
BOOL table = [database executeUpdate:createTableSql];
NSLog(@"table = %i",table);
NSLog(@"path = %@",dbString);
//创建插入数据的SQL语句
NSString *insertSql = @"insert into MyFriends(name,phone,age,email,address) values (?,?,?,?,?)";
BOOL insert = [database executeUpdate:insertSql,model.name,model.phone,model.age,model.email,model.address];
NSLog(@"insert = %i",insert);
//关闭数据库
[database close];
return insert;
}
这里我们创建了一个User.db的数据库和一张名为MyFriends的表，表中有6个元素：id, name, phone, age, email,address.
2.查询表中数据
+(NSMutableArray *)readDataFromSql
{
NSMutableArray *dataArray = [[NSMutableArray alloc] init];
NSString *dbString = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/User.db"];
FMDatabase *database = [[FMDatabase alloc] initWithPath:dbString];
[database open];
NSString *selectString = @"select * from MyFriends";
FMResultSet *set = [database executeQuery:selectString];
while ([set next]) {
LHCDataModel *model = [[LHCDataModel alloc] init];
model.name = [set stringForColumn:@"name"];
model.phone = [set stringForColumn:@"phone"];
model.age = [set stringForColumn:@"age"];
model.email = [set stringForColumn:@"email"];
model.address = [set stringForColumn:@"address"];
model.rowId = [[set stringForColumn:@"id"] integerValue];
[dataArray addObject:model];
}
[database close];
return dataArray;
}
3.修改表中数据
+(BOOL)updateDataFromSql:(LHCDataModel *)model andbefore:(LHCDataModel *)beModel
{
NSString *dbString = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/User.db"];
FMDatabase *database = [[FMDatabase alloc] initWithPath:dbString];
[database open];
//判断条件可用id，如下面的删除数据
NSString *updateString = @"update MyFriends set name = ?, phone = ? , age = ? , email = ? , address = ? where name = ? and phone = ?";
BOOL update = [database executeUpdate:updateString,model.name,model.phone,model.age,model.email,model.address,beModel.name,beModel.phone];
NSLog(@"update = %i",update);
[database close];
return update;
}
4.删除表中数据
+(BOOL)deleteDataFromSql:(LHCDataModel *)model
{
NSString *dbString = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/User.db"];
FMDatabase *database = [[FMDatabase alloc] initWithPath:dbString];
[database open];
NSString *deleteString = @"delete from MyFriends where id = ?";
BOOL delete = [database executeUpdate:deleteString,[NSString stringWithFormat:@"%ld",model.rowId]];
NSLog(@"delete = %i",delete);
return delete;
}
到这里结合UI简易通讯录的核心操作差不多完成了
这里写的比较简陋，可参考我的Demo简易通讯录
地址：http://git.oschina.net/haitangliuxing/MyAddressBook