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add some funcs of table

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源文雨
2022-05-03 21:14:30 +08:00
parent 19e09bc630
commit d17f36b255
7 changed files with 174 additions and 16 deletions
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10
api/table.md
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@@ -8,16 +8,16 @@
│ table name length │ name of the table ( variable length ) │
├─────────────────────┼──────────┬──────────┬──────────┬──────────┬──────────┬──────────┤
│ │ type of │ type of │ type of │ type of │ type of │ type of │
│ table column length │ column │ column │ column │ column │ column │ column │
│ table row length │ row │ row │ row │ row │ row │ row │
│ │ No.1 │ No.2 │ No.3 │ No.4 │ No... │ No.N │
├─────────────────────┴──────────┴──────────┴──────────┴──────────┴──────────┴──────────┤
│ index pointer of pk ( this pointer will never be zero ) │
├───────────────────────────────────────────────────────────────────────────────────────┤
│ index pointer of column No.2 ( if it's zero, there is no index for this column ) │
│ index pointer of row No.2 ( if it's zero, there is no index for this row ) │
├───────────────────────────────────────────────────────────────────────────────────────┤
│ index pointer of column No... ( if it's zero, there is no index for this column ) │
│ index pointer of row No... ( if it's zero, there is no index for this row ) │
├───────────────────────────────────────────────────────────────────────────────────────┤
│ index pointer of column No.N ( if it's zero, there is no index for this column ) │
│ index pointer of row No.N ( if it's zero, there is no index for this row ) │
├───────────────────────────────────────────────────────────────────────────────────────┤
│ index pointer of first foreign key ( if available ) │
├───────────────────────────────────────────────────────────────────────────────────────┤
@@ -31,7 +31,7 @@
> 区块长度固定，但是不同索引类型有所不同
详见[索引格式](/api/index.md)。
### 表项
> 区块长度固定，为`8+len(column1)+len(column2)+...+len(columnN)`字节
> 区块长度固定，为`8+len(row 1)+len(row 2)+...+len(row N)`字节
为方便遍历，数据表项以uint64的指针开头，代表下一项的地址。接下来按照[数据类型](/api/types.md)中规定的存储格式依次附加第一项、第二项直到第N项的值。
#### 表项的增加
优先附加到上一个表项末尾。如无法实现，则从空区块选取一个，或附加到整个文件末尾。