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需求:
将数据库中的markdown文本导出后换行符变成了“\n”,再导入到其他数据库时需要将\n转成数据库中的换行。
方法:
在sqlite中 换行符 为x’0a’
Sqlite 字段替换换行符 方法为:update table set title =replace(title, x'0a','')
解释:
其实,在sqlite中特殊的字符是ASCLL码,如果想替换回车字符改成13,可以如下写法:
UPDATE table_name SET field_name=REPLACE(field_name,char(13),'')
UPDATE table_name SET field_name=REPLACE(field_name,x'13',‘')
最后,附上 ASCII码表 0-127
二进制 | Decode | Hex 缩写/字符 | 解释 |
---|---|---|---|
00000000 | 0 0 | 0 | NUL(null) 空字符 |
00000001 | 1 0 | 1 | SOH(start of headling) 标题开始 |
00000010 | 2 0 | 2 | STX (start of text) 正文开始 |
00000011 | 3 0 | 3 | ETX (end of text) 正文结束 |
00000100 | 4 0 | 4 | EOT (end of transmission) 传输结束 |
00000101 | 5 0 | 5 | ENQ (enquiry) 请求 |
00000110 | 6 0 | 6 | ACK (acknowledge) 收到通知 |
00000111 | 7 0 | 7 | BEL (bell) 响铃 |
00001000 | 8 0 | 8 | BS (backspace) 退格 |
00001001 | 9 0 | 9 | HT (horizontal tab) 水平制表符 |
00001010 | 10 | 0A | LF (NL line feed, new line) 换行键 |
00001011 | 11 | 0B | VT (vertical tab) 垂直制表符 |
00001100 | 12 | 0C | FF (NP form feed, new page) 换页键 |
00001101 | 13 | 0D | CR (carriage return) 回车键 |
00001110 | 14 | 0E | SO (shift out) 不用切换 |
00001111 | 15 | 0F | SI (shift in) 启用切换 |
00010000 | 16 | 10 | DLE (data link escape) 数据链路转义 |
00010001 | 17 | 11 | DC1 (device control 1) 设备控制1 |
00010010 | 18 | 12 | DC2 (device control 2) 设备控制2 |
00010011 | 19 | 13 | DC3 (device control 3) 设备控制3 |
00010100 | 20 | 14 | DC4 (device control 4) 设备控制4 |
00010101 | 21 | 15 | NAK (negative acknowledge) 拒绝接收 |
00010110 | 22 | 16 | SYN (synchronous idle) 同步空闲 |
00010111 | 23 | 17 | ETB (end of trans. block) 传输块结束 |
00011000 | 24 | 18 | CAN (cancel) 取消 |
00011001 | 25 | 19 | EM (end of medium) 介质中断 |
00011010 | 26 | 1A | SUB (substitute) 替补 |
00011011 | 27 | 1B | ESC (escape) 溢出 |
00011100 | 28 | 1C | FS (file separator) 文件分割符 |
00011101 | 29 | 1D | GS (group separator) 分组符 |
00011110 | 30 | 1E | RS (record separator) 记录分离符 |
00011111 | 31 | 1F | US (unit separator) 单元分隔符 |
00100000 | 32 | 20 | (space) 空格 |
00100001 | 33 | 21 | ! |
00100010 | 34 | 22 | " |
00100011 | 35 | 23 | # |
00100100 | 36 | 24 | $ |
00100101 | 37 | 25 | % |
00100110 | 38 | 26 | & |
00100111 | 39 | 27 | ’ |
00101000 | 40 | 28 | ( |
00101001 | 41 | 29 | ) |
00101010 | 42 | 2A | * |
00101011 | 43 | 2B | + |
00101100 | 44 | 2C | , |
00101101 | 45 | 2D | - |
00101110 | 46 | 2E | . |
00101111 | 47 | 2F | / |
00110000 | 48 | 30 | 0 |
00110001 | 49 | 31 | 1 |
00110010 | 50 | 32 | 2 |
00110011 | 51 | 33 | 3 |
00110100 | 52 | 34 | 4 |
00110101 | 53 | 35 | 5 |
00110110 | 54 | 36 | 6 |
00110111 | 55 | 37 | 7 |
00111000 | 56 | 38 | 8 |
00111001 | 57 | 39 | 9 |
00111010 | 58 | 3A | : |
00111011 | 59 | 3B | ; |
00111100 | 60 | 3C | < |
00111101 | 61 | 3D | = |
00111110 | 62 | 3E | > |
00111111 | 63 | 3F | ? |
01000000 | 64 | 40 | @ |
01000001 | 65 | 41 | A |
01000010 | 66 | 42 | B |
01000011 | 67 | 43 | C |
01000100 | 68 | 44 | D |
01000101 | 69 | 45 | E |
01000110 | 70 | 46 | F |
01000111 | 71 | 47 | G |
01001000 | 72 | 48 | H |
01001001 | 73 | 49 | I |
01001010 | 74 | 4A | J |
01001011 | 75 | 4B | K |
01001100 | 76 | 4C | L |
01001101 | 77 | 4D | M |
01001110 | 78 | 4E | N |
01001111 | 79 | 4F | O |
01010000 | 80 | 50 | P |
01010001 | 81 | 51 | Q |
01010010 | 82 | 52 | R |
01010011 | 83 | 53 | S |
01010100 | 84 | 54 | T |
01010101 | 85 | 55 | U |
01010110 | 86 | 56 | V |
01010111 | 87 | 57 | W |
01011000 | 88 | 58 | X |
01011001 | 89 | 59 | Y |
01011010 | 90 | 5A | Z |
01011011 | 91 | 5B | [ |
01011100 | 92 | 5C | \ |
01011101 | 93 | 5D | ] |
01011110 | 94 | 5E | ^ |
01011111 | 95 | 5F | _ |
01100000 | 96 | 60 | ` |
01100001 | 97 | 61 | a |
01100010 | 98 | 62 | b |
01100011 | 99 | 63 | c |
01100100 | 100 | 6 | 4 d |
01100101 | 101 | 6 | 5 e |
01100110 | 102 | 6 | 6 f |
01100111 | 103 | 6 | 7 g |
01101000 | 104 | 6 | 8 h |
01101001 | 105 | 6 | 9 i |
01101010 | 106 | 6 | A j |
01101011 | 107 | 6 | B k |
01101100 | 108 | 6 | C l |
01101101 | 109 | 6 | D m |
01101110 | 110 | 6 | E n |
01101111 | 111 | 6 | F o |
01110000 | 112 | 7 | 0 p |
01110001 | 113 | 7 | 1 q |
01110010 | 114 | 7 | 2 r |
01110011 | 115 | 7 | 3 s |
01110100 | 116 | 7 | 4 t |
01110101 | 117 | 7 | 5 u |
01110110 | 118 | 7 | 6 v |
01110111 | 119 | 7 | 7 w |
01111000 | 120 | 7 | 8 x |
01111001 | 121 | 7 | 9 y |
01111010 | 122 | 7 | A z |
01111011 | 123 | 7 | B { |
01111100 | 124 | 7 | C |
01111101 | 125 | 7 | D } |
01111110 | 126 | 7 | E ~ |
01111111 | 127 | 7 | F DEL (delete) 删除 |
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