从 MySQL 迁移数据到 Oracle 中的全过程

小鱼儿 2023-06-25 03:11 18阅读 0赞

### 一、前言 ###

这里记录一次将`MySQL`数据库中的表数据迁移到`Oracle`数据库中的全过程 ，使用工具 `Navicat`，版本 12.0.11

###### 操作环境及所用工具： ######

1.  mysql5.7
2.  oracle18c
3.  windows
4.  Navicat12.0.11
5.  idea

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### 二、开始移植 ###

点击 `工具` \-> `数据传输`

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左边 `源` 标识mysql数据库 ， 右边 `目标` 标识要移植到的oracle数据库  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 2]  
高级选项中勾选`大写`

> **温馨小提示：**  
> 如果字段名和表名都为小写，oracle操作数据的时候将会出现找不到表或视图的错误，解决方法是必须加上双引号才能查询到， 这样的话我们通过程序操作数据的时候必须加上双引号，即大大加重了迁移数据库后的工作量，因此这里需`勾选转换对象名为大写` ，同时在转换过程中如果字段名出现oracle关键字的话，它会自动给我们加上双引号解决关键字的困扰！！！  
> 【 ex: `user -> "USER"` `number -> "NUMBER"` `desc -> "DESC"` `level -> "LEVEL"` 】

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 3]

选择需要移植的表，这里我一把梭全选了~  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 4]  
然后等待数据传输完成  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 5]  
如果最后遇到如下情况，可暂不管，直接关闭即可~  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 6]  
然后查看oracle，如下，数据导入成功  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 7]

> 温馨小提示：传输过程中可能会存在有部分几张表不成功，手动导一下就好了~~

### 三、问题 ###

#### 1、解决oracle自增主键 ####

##### oracle设置自增主键的几种方式： #####

1.  `序列` \+ `触发器`
2.  `序列` \+ `Hibernate配置` (注：此方式仅适用于通过Hibernate连接数据库的方式)
3.  oracle12c版本之后新增 自增列语法 `GENERATED BY DEFAULT AS IDENTITY`

##### 解决思路： #####

在ddl 创建表sql中添加自增主键的命令，重新创建一次表结构，然后再将oracle中的数据单独导入  
这里由于小编oracle版本为18c 因此在创建表的时候加上自增主键语法即可完成！

###### ① 备份数据 -> 数据泵方式 ######

`数据泵` \-> `数据泵导出`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 8]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 9]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 10]

###### ② idea中如下查看ddl ######

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 11]  
然后将ddl拷贝到一个txt文本文件中保存  
![在这里插入图片描述][20191226124115517.png]

###### ③ ddl文件内容替换自增主键工具类 ######

> **温馨小提示：**  
> 这里小编数据库中的时间类型为 `DATE` 类型 需 改为 `TIMESTAMP` 类型 ，这个问题可以直接使用idea的替换功能完成修改~ ，其余修改可根据个人实际情况来进行修改  
> ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 12]

public class MySQLToOracleTest { 
    
        public static void main(String[] args) { 
            try { 
                replaceDDLContent("D:\\Users\\zq\\Desktop\\oracle测试\\oracle_ddl.txt"); // TODO 这里修改为自己的ddl文件存放位置
            } catch (IOException e) { 
                e.printStackTrace();
            }
        }
    
        /** * 替换文本文件中的 自增主键ID * * @param path * @throws IOException */
        public static void replaceDDLContent(String path) throws IOException { 
            // 原有的内容
            String srcStr = "not null";
            // 要替换的内容
            String replaceStr = "GENERATED BY DEFAULT AS IDENTITY";
            // 读
            File file = new File(path);
            FileReader in = new FileReader(file);
            BufferedReader bufIn = new BufferedReader(in);
            // 内存流, 作为临时流
            CharArrayWriter tempStream = new CharArrayWriter();
            // 替换
            String line = null;
            // 需要替换的行
            Map<Integer, Object> lineMap = new HashMap<>(104);
            //定义顺序变量
            int count = 0;
            while ((line = bufIn.readLine()) != null) { 
                count++;
                if (line.contains("create table")) { 
                    lineMap.put(count + 2, line);
                }
    
                //遍历map中的键
                for (Integer key : lineMap.keySet()) { 
                    if (count == key && !line.contains("NVARCHAR2")) { 
                        // TODO 在这里这是自增主键哦
                        line = line.replaceAll(srcStr, replaceStr);
                        lineMap.put(count, line);
                    }
                }
    
                // 将该行写入内存
                tempStream.write(line);
                // 添加换行符
                tempStream.append(System.getProperty("line.separator"));
            }
            // 关闭 输入流
            bufIn.close();
            // 将内存中的流 写入 文件
            FileWriter out = new FileWriter(file);
            tempStream.writeTo(out);
            out.close();
            System.out.println("文件存放位置:" + path);
            System.out.println(lineMap);
        }
    
    }

###### ④ 将替换过后的ddl拷贝到idea中的一个新控制台中运行创建表 ######

全选ddl，然后点击左上角运行创建表 【 注：这里需先清空该库下所有表，因此步骤①要先备份一下从mysql迁移到oracle后的表数据，不要忘记哦！！】  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 13]  
等待表全部创建成功，如下所示：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 14]

###### ⑤ 导入备份数据 ######

`数据泵` \-> `数据泵导入`  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 15]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 16]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 17]

###### ⑥ 最后查看数据导入成功！ ######

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 18]

这时候，数据有了，自增主键也有了，但是存在一个问题就是插入数据的时候主键自增ID都是从1开始自增，如果表中没有数据都还ok，问题是如果表有数据，就会出现主键ID重复的问题！！！

#### 2、解决自增主键ID无法从表数据ID最大值开始增值 ####

###### 思路：拼接出修改表自增ID从几开始的sql即可！ ######

SELECT
    	'SELECT ''ALTER TABLE SEWAGE_GY.' || t1.table_name || ' MODIFY(' || t1.Column_Name || ' Generated as Identity (START WITH '' || MAX( ' || t1.Column_Name || '+1 ) || ''));'' FROM ' || t1.table_name || ' UNION ALL' AS FINAL_SQL
    FROM cols t1
    LEFT JOIN user_col_comments t2 ON t1.Table_name = t2.Table_name AND t1.Column_Name = t2.Column_Name
    LEFT JOIN user_tab_comments t3 ON t1.Table_name = t3.Table_name
    WHERE
    	NOT EXISTS (
            SELECT t4.Object_Name
            FROM User_objects t4
            WHERE
                t4.Object_Type = 'TABLE'
                AND t4.TEMPORARY = 'Y'
                AND t4.Object_Name = t1.Table_Name
    	)
    	AND t1.IDENTITY_COLUMN = 'YES'
    ORDER BY t1.Table_Name, t1.Column_ID

命令解析：

# 设置表主键ID从多少开始自增 ex:下面标识从10000开始自增
    ALTER TABLE 数据库名.表名 MODIFY(主键ID Generated as Identity (START WITH 10000));
    
    # 查询该库下所有表名
    SELECT table_name FROM user_tables;
    
    # 查询出指定表的主键ID字段名
    SELECT t1.table_name,t1.Column_Name
    FROM cols t1
    	LEFT JOIN user_col_comments t2 ON t1.Table_name = t2.Table_name AND t1.Column_Name = t2.Column_Name
    	LEFT JOIN user_tab_comments t3 ON t1.Table_name = t3.Table_name 
    WHERE NOT EXISTS (
    		SELECT t4.Object_Name 
    		FROM User_objects t4 
    		WHERE t4.Object_Type = 'TABLE' 
    			AND t4.TEMPORARY = 'Y' 
    			AND t4.Object_Name = t1.Table_Name 
    	) 
    	AND t1.table_name = '表名' 
    	AND t1.IDENTITY_COLUMN = 'YES' 
    ORDER BY t1.Table_Name, t1.Column_ID
    
    # 查询该库下所有表名+表主键字段名
    SELECT t1.table_name,t1.Column_Name
    FROM cols t1
    	LEFT JOIN user_col_comments t2 ON t1.Table_name = t2.Table_name AND t1.Column_Name = t2.Column_Name
    	LEFT JOIN user_tab_comments t3 ON t1.Table_name = t3.Table_name 
    WHERE NOT EXISTS (
    		SELECT t4.Object_Name 
    		FROM User_objects t4 
    		WHERE t4.Object_Type = 'TABLE' 
    			AND t4.TEMPORARY = 'Y' 
    			AND t4.Object_Name = t1.Table_Name 
    	) 
    	AND t1.IDENTITY_COLUMN = 'YES' 
    ORDER BY t1.Table_Name, t1.Column_ID

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 19]  
拷贝到新的控制台后注意删除最后一个 `UNION ALL` 再运行哦！！！  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 20]  
最终完成自增主键ID从表数据最大值开始自增！  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly96aGVuZ3FpbmcuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 21]

#### 3、程序中的sql语句转换 ####

这里结合个人语言实际操作…

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