FMDB

FMDB可以使用OC的方法操作数据库。

百度可以搜到FMDB的相关信息：使用方法、框架

/*
 1、打开关闭数据库
 */
//    1、打开关闭数据库
    NSString *path = [NSHomeDirectory()stringByAppendingPathComponent:@"fmdb.sqlite"];
//    找到数据库的路径
    FMDatabase *db = [FMDatabase databaseWithPath:path];
//    打开数据库
   BOOL isOpen = [db open];//BOOL类型
/*
 系统自带的打开数据库方式sqlite3_open(path, &db)返回一个int
 */
//    数据库关闭
//    [db close];
//    系统：sqlite3_close(db)
    /*
     数据库增删改等操作：
     除了查询操作，FMDB数据库操作都执行executeUpdate方法，这个方法返回BOOL类型
     */
    [db executeUpdate:@"增删该sql语句"];
//  系统： sqlite3_exec(db, [@"增删改sql语句" UTF8String], NULL, NULL, &error)
   
    NSString *TABLENAME = @"user";
    NSString *ID = @"ID";
    NSString *NAME = @"NAME";
    NSString *AGE = @"AGE";
    NSString *ADDRESS = @"ADDRESS";
   
//    创建表
    if ([db open]) {
        NSString *sqlCreateTable =  [NSString stringWithFormat:@"CREATE TABLE IF NOT EXISTS '%@' ('%@' INTEGER PRIMARY KEY AUTOINCREMENT, '%@' TEXT, '%@' INTEGER, '%@' TEXT)",TABLENAME,ID,NAME,AGE,ADDRESS];
        BOOL res = [db executeUpdate:sqlCreateTable];
        if (!res) {
            NSLog(@"error when creating db table");
        } else {
            NSLog(@"success to creating db table");
        }
        [db close];
       
    }
   
//    添加数据：
    if ([db open]) {
        NSString *insertSql1= [NSString stringWithFormat:
        @"INSERT INTO '%@' ('%@', '%@', '%@') VALUES ('%@', '%@', '%@')",
        TABLENAME, NAME, AGE, ADDRESS, @"张三",@"13",@"济南"];
        BOOL res = [db executeUpdate:insertSql1];
        NSString *insertSql2 = [NSString stringWithFormat:
        @"INSERT INTO '%@' ('%@', '%@', '%@') VALUES ('%@', '%@', '%@')",
        TABLENAME, NAME, AGE, ADDRESS, @"李四",@"12",@"济南"];
        BOOL res2 = [db executeUpdate:insertSql2];
       
        if (!res) {
            NSLog(@"error when insert db table");
        } else {
            NSLog(@"success to insert db table");
        }
       
        if (!res2) {
            NSLog(@"error when insert db table");
        } else {
            NSLog(@"success to insert db table");
        }
        [db close];
       
    }
   
//    修改数据：
    if ([db open]) {
        NSString *updateSql = [NSString stringWithFormat:
                               @"UPDATE '%@' SET '%@' = '%@' WHERE '%@' = '%@'",
                               TABLENAME,   AGE,  @"15" ,AGE,  @"13"];
        BOOL res = [db executeUpdate:updateSql];
        if (!res) {
            NSLog(@"error when update db table");
        } else {
            NSLog(@"success to update db table");
        }
        [db close];
       
    }
   
//    删除数据：
    if ([db open]) {
       
        NSString *deleteSql = [NSString stringWithFormat:
                               @"delete from %@ where %@ = '%@'",
                               TABLENAME, NAME, @"张三"];
        BOOL res = [db executeUpdate:deleteSql];
       
        if (!res) {
            NSLog(@"error when delete db table");
        } else {
            NSLog(@"success to delete db table");
        }
        [db close];
       
    }
//    查询数据库：executeQuery
//    [db executeQuery:@"查询sql语句"];
    if ([db open]) {
        NSString * sql = [NSString stringWithFormat:
                          @"SELECT * FROM %@",TABLENAME];
        FMResultSet * rs = [db executeQuery:sql];
        while ([rs next]) {
            int Id = [rs intForColumn:ID];
            NSString * name = [rs stringForColumn:NAME];
            NSString * age = [rs stringForColumn:AGE];
            NSString * address = [rs stringForColumn:ADDRESS];
            NSLog(@"id = %d, name = %@, age = %@  address = %@", Id, name, age, address);
        }
        [db close];
    }
/*
 系统方法：
 sqlite3_stmt *stmt;
 sqlite3_prepare_v2(db, [@"" UTF8String], -1, &stmt, nil);
 sqlite3_bind_text(stmt, 1, [@"" UTF8String], -1, nil);
 while (sqlite3_step(stmt) == SQLITE_ROW) {
 
 //        stmt 查询到的结果
 sqlite3_column_text(stmt, 0);

 }