1 | <?php |
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2 | |
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3 | /** |
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4 | V5.18 3 Sep 2012 (c) 2000-2012 John Lim (jlim#natsoft.com). All rights reserved. |
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5 | Released under both BSD license and Lesser GPL library license. |
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6 | Whenever there is any discrepancy between the two licenses, |
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7 | the BSD license will take precedence. |
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8 | |
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9 | Set tabs to 4 for best viewing. |
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10 | |
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11 | */ |
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12 | // security - hide paths |
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13 | if (!defined('ADODB_DIR')) die(); |
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14 | |
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15 | class ADODB2_db2 extends ADODB_DataDict { |
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16 | |
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17 | var $databaseType = 'db2'; |
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18 | var $seqField = false; |
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19 | |
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20 | function ActualType($meta) |
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21 | { |
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22 | switch($meta) { |
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23 | case 'C': return 'VARCHAR'; |
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24 | case 'XL': return 'CLOB'; |
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25 | case 'X': return 'VARCHAR(3600)'; |
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26 | |
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27 | case 'C2': return 'VARCHAR'; // up to 32K |
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28 | case 'X2': return 'VARCHAR(3600)'; // up to 32000, but default page size too small |
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29 | |
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30 | case 'B': return 'BLOB'; |
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31 | |
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32 | case 'D': return 'DATE'; |
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33 | case 'TS': |
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34 | case 'T': return 'TIMESTAMP'; |
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35 | |
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36 | case 'L': return 'SMALLINT'; |
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37 | case 'I': return 'INTEGER'; |
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38 | case 'I1': return 'SMALLINT'; |
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39 | case 'I2': return 'SMALLINT'; |
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40 | case 'I4': return 'INTEGER'; |
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41 | case 'I8': return 'BIGINT'; |
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42 | |
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43 | case 'F': return 'DOUBLE'; |
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44 | case 'N': return 'DECIMAL'; |
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45 | default: |
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46 | return $meta; |
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47 | } |
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48 | } |
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49 | |
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50 | // return string must begin with space |
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51 | function _CreateSuffix($fname,&$ftype,$fnotnull,$fdefault,$fautoinc,$fconstraint,$funsigned) |
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52 | { |
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53 | $suffix = ''; |
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54 | if ($fautoinc) return ' GENERATED ALWAYS AS IDENTITY'; # as identity start with |
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55 | if (strlen($fdefault)) $suffix .= " DEFAULT $fdefault"; |
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56 | if ($fnotnull) $suffix .= ' NOT NULL'; |
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57 | if ($fconstraint) $suffix .= ' '.$fconstraint; |
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58 | return $suffix; |
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59 | } |
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60 | |
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61 | function AlterColumnSQL($tabname, $flds) |
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62 | { |
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63 | if ($this->debug) ADOConnection::outp("AlterColumnSQL not supported"); |
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64 | return array(); |
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65 | } |
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66 | |
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67 | |
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68 | function DropColumnSQL($tabname, $flds) |
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69 | { |
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70 | if ($this->debug) ADOConnection::outp("DropColumnSQL not supported"); |
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71 | return array(); |
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72 | } |
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73 | |
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74 | |
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75 | function ChangeTableSQL($tablename, $flds, $tableoptions = false) |
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76 | { |
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77 | |
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78 | /** |
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79 | Allow basic table changes to DB2 databases |
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80 | DB2 will fatally reject changes to non character columns |
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81 | |
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82 | */ |
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83 | |
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84 | $validTypes = array("CHAR","VARC"); |
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85 | $invalidTypes = array("BIGI","BLOB","CLOB","DATE", "DECI","DOUB", "INTE", "REAL","SMAL", "TIME"); |
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86 | // check table exists |
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87 | $cols = $this->MetaColumns($tablename); |
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88 | if ( empty($cols)) { |
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89 | return $this->CreateTableSQL($tablename, $flds, $tableoptions); |
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90 | } |
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91 | |
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92 | // already exists, alter table instead |
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93 | list($lines,$pkey) = $this->_GenFields($flds); |
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94 | $alter = 'ALTER TABLE ' . $this->TableName($tablename); |
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95 | $sql = array(); |
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96 | |
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97 | foreach ( $lines as $id => $v ) { |
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98 | if ( isset($cols[$id]) && is_object($cols[$id]) ) { |
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99 | /** |
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100 | If the first field of $v is the fieldname, and |
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101 | the second is the field type/size, we assume its an |
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102 | attempt to modify the column size, so check that it is allowed |
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103 | $v can have an indeterminate number of blanks between the |
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104 | fields, so account for that too |
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105 | */ |
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106 | $vargs = explode(' ' , $v); |
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107 | // assume that $vargs[0] is the field name. |
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108 | $i=0; |
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109 | // Find the next non-blank value; |
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110 | for ($i=1;$i<sizeof($vargs);$i++) |
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111 | if ($vargs[$i] != '') |
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112 | break; |
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113 | |
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114 | // if $vargs[$i] is one of the following, we are trying to change the |
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115 | // size of the field, if not allowed, simply ignore the request. |
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116 | if (in_array(substr($vargs[$i],0,4),$invalidTypes)) |
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117 | continue; |
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118 | // insert the appropriate DB2 syntax |
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119 | if (in_array(substr($vargs[$i],0,4),$validTypes)) { |
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120 | array_splice($vargs,$i,0,array('SET','DATA','TYPE')); |
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121 | } |
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122 | |
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123 | // Now Look for the NOT NULL statement as this is not allowed in |
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124 | // the ALTER table statement. If it is in there, remove it |
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125 | if (in_array('NOT',$vargs) && in_array('NULL',$vargs)) { |
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126 | for ($i=1;$i<sizeof($vargs);$i++) |
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127 | if ($vargs[$i] == 'NOT') |
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128 | break; |
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129 | array_splice($vargs,$i,2,''); |
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130 | } |
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131 | $v = implode(' ',$vargs); |
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132 | $sql[] = $alter . $this->alterCol . ' ' . $v; |
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133 | } else { |
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134 | $sql[] = $alter . $this->addCol . ' ' . $v; |
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135 | } |
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136 | } |
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137 | |
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138 | return $sql; |
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139 | } |
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140 | |
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141 | } |
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142 | |
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143 | |
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144 | ?> |
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