replace 函數用法如下：
replace（'將要更改的字符串','被替換掉的字符串','替換字符串'）
oracle 中chr()函數
CHR() --將ASCII碼轉換為字符
語法
CHR(number_code)
示例
select CHR(116) from dual; --返回't'
幾個常用的chr()函數:
chr(9) --制表符
chr(10) --換行符
chr(13) --回車符
chr(32) --空格符
chr(34) --雙引號“"”
例：replace('111<br/>333444',chr(13)||chr(10), ' ')
CHR()有個對應的函數ASCII()，可以實現相反的作用。
ASCII() --將字符轉換為ASCII碼
語法 ASCII(single_character)
示例 select ASCII('t') from dual; --返回116
ASCII表
| Dec | Hex | Oct | Char | Description |
|---|---|---|---|---|
| 0 | 0 | 000 | null | |
| 1 | 1 | 001 | start of heading | |
| 2 | 2 | 002 | start of text | |
| 3 | 3 | 003 | end of text | |
| 4 | 4 | 004 | end of transmission | |
| 5 | 5 | 005 | enquiry | |
| 6 | 6 | 006 | acknowledge | |
| 7 | 7 | 007 | bell | |
| 8 | 8 | 010 | backspace | |
| 9 | 9 | 011 | horizontal tab | |
| 10 | A | 012 | new line | |
| 11 | B | 013 | vertical tab | |
| 12 | C | 014 | new page | |
| 13 | D | 015 | carriage return | |
| 14 | E | 016 | shift out | |
| 15 | F | 017 | shift in | |
| 16 | 10 | 020 | data link escape | |
| 17 | 11 | 021 | device control 1 | |
| 18 | 12 | 022 | device control 2 | |
| 19 | 13 | 023 | device control 3 | |
| 20 | 14 | 024 | device control 4 | |
| 21 | 15 | 025 | negative acknowledge | |
| 22 | 16 | 026 | synchronous idle | |
| 23 | 17 | 027 | end of trans. block | |
| 24 | 18 | 030 | cancel | |
| 25 | 19 | 031 | end of medium | |
| 26 | 1A | 032 | substitute | |
| 27 | 1B | 033 | escape | |
| 28 | 1C | 034 | file separator | |
| 29 | 1D | 035 | group separator | |
| 30 | 1E | 036 | record separator | |
| 31 | 1F | 037 | unit separator | |
| 32 | 20 | 040 | space | |
| 33 | 21 | 041 | ! | |
| 34 | 22 | 042 | " | |
| 35 | 23 | 043 | # | |
| 36 | 24 | 044 | $ | |
| 37 | 25 | 045 | % | |
| 38 | 26 | 046 | & | |
| 39 | 27 | 047 | ' | |
| 40 | 28 | 050 | ( | |
| 41 | 29 | 051 | ) | |
| 42 | 2A | 052 | * | |
| 43 | 2B | 053 | + | |
| 44 | 2C | 054 | , | |
| 45 | 2D | 055 | - | |
| 46 | 2E | 056 | . | |
| 47 | 2F | 057 | / | |
| 48 | 30 | 060 | 0 | |
| 49 | 31 | 061 | 1 | |
| 50 | 32 | 062 | 2 | |
| 51 | 33 | 063 | 3 | |
| 52 | 34 | 064 | 4 | |
| 53 | 35 | 065 | 5 | |
| 54 | 36 | 066 | 6 | |
| 55 | 37 | 067 | 7 | |
| 56 | 38 | 070 | 8 | |
| 57 | 39 | 071 | 9 | |
| 58 | 3A | 072 | : | |
| 59 | 3B | 073 | ; | |
| 60 | 3C | 074 | < | |
| 61 | 3D | 075 | = | |
| 62 | 3E | 076 | > | |
| 63 | 3F | 077 | ? | |
| 64 | 40 | 100 | @ | |
| 65 | 41 | 101 | A | |
| 66 | 42 | 102 | B | |
| 67 | 43 | 103 | C | |
| 68 | 44 | 104 | D | |
| 69 | 45 | 105 | E | |
| 70 | 46 | 106 | F | |
| 71 | 47 | 107 | G | |
| 72 | 48 | 110 | H | |
| 73 | 49 | 111 | I | |
| 74 | 4A | 112 | J | |
| 75 | 4B | 113 | K | |
| 76 | 4C | 114 | L | |
| 77 | 4D | 115 | M | |
| 78 | 4E | 116 | N | |
| 79 | 4F | 117 | O | |
| 80 | 50 | 120 | P | |
| 81 | 51 | 121 | Q | |
| 82 | 52 | 122 | R | |
| 83 | 53 | 123 | S | |
| 84 | 54 | 124 | T | |
| 85 | 55 | 125 | U | |
| 86 | 56 | 126 | V | |
| 87 | 57 | 127 | W | |
| 88 | 58 | 130 | X | |
| 89 | 59 | 131 | Y | |
| 90 | 5A | 132 | Z | |
| 91 | 5B | 133 | [ | |
| 92 | 5C | 134 | \ | |
| 93 | 5D | 135 | ] | |
| 94 | 5E | 136 | ^ | |
| 95 | 5F | 137 | _ | |
| 96 | 60 | 140 | ` | |
| 97 | 61 | 141 | a | |
| 98 | 62 | 142 | b | |
| 99 | 63 | 143 | c | |
| 100 | 64 | 144 | d | |
| 101 | 65 | 145 | e | |
| 102 | 66 | 146 | f | |
| 103 | 67 | 147 | g | |
| 104 | 68 | 150 | h | |
| 105 | 69 | 151 | i | |
| 106 | 6A | 152 | j | |
| 107 | 6B | 153 | k | |
| 108 | 6C | 154 | l | |
| 109 | 6D | 155 | m | |
| 110 | 6E | 156 | n | |
| 111 | 6F | 157 | o | |
| 112 | 70 | 160 | p | |
| 113 | 71 | 161 | q | |
| 114 | 72 | 162 | r | |
| 115 | 73 | 163 | s | |
| 116 | 74 | 164 | t | |
| 117 | 75 | 165 | u | |
| 118 | 76 | 166 | v | |
| 119 | 77 | 167 | w | |
| 120 | 78 | 170 | x | |
| 121 | 79 | 171 | y | |
| 122 | 7A | 172 | z | |
| 123 | 7B | 173 | { | |
| 124 | 7C | 174 | | | |
| 125 | 7D | 175 | } | |
| 126 | 7E | 176 | ~ | |
| 127 | 7F | 177 | DEL |