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Now generators support to add/drop column defaults

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This commit is contained in:
stronk7
2006-09-25 18:22:06 +00:00
parent c0a1aae3e2
commit 812e363a39
5 changed files with 161 additions and 9 deletions
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lib/xmldb/classes/generators/XMLDBGenerator.class.php
+30 -2
View File
@@ -51,6 +51,9 @@ class XMLDBgenerator {
var $unsigned_allowed = true; // To define in the generator must handle unsigned information
var $default_for_char = null; // To define the default to set for NOT NULLs CHARs without default (null=do nothing)
var $drop_default_clause_required = false; //To specify if the generator must use some DEFAULT clause to drop defaults
var $drop_default_clause = ''; //The DEFAULT clause required to drop defaults
var $default_after_null = true; //To decide if the default clause of each field must go after the null clause
var $specify_nulls = false; //To force the generator if NULL clauses must be specified. It shouldn't be necessary
@@ -418,7 +421,7 @@ class XMLDBgenerator {
$default = '';
if ($xmldb_field->getDefault() != NULL) {
$default = ' default ';
$default = ' DEFAULT ';
if ($xmldb_field->getType() == XMLDB_TYPE_CHAR ||
$xmldb_field->getType() == XMLDB_TYPE_TEXT) {
$default .= "'" . addslashes($xmldb_field->getDefault()) . "'";
@@ -431,7 +434,15 @@ class XMLDBgenerator {
if ($this->default_for_char !== NULL &&
$xmldb_field->getType() == XMLDB_TYPE_CHAR &&
$xmldb_field->getNotNull()) {
$default .= ' default ' . "'" . $this->default_for_char . "'";
$default = ' DEFAULT ' . "'" . $this->default_for_char . "'";
} else {
/// If the DB requires to explicity define some clause to drop one default, do it here
/// never applying defaults to TEXT and BINARY fields
if ($this->drop_default_clause_required &&
$xmldb_field->getType() != XMLDB_TYPE_TEXT &&
$xmldb_field->getType() != XMLDB_TYPE_BINARY) {
$default = ' DEFAULT ' . $this->drop_default_clause;
}
}
}
return $default;
@@ -593,6 +604,7 @@ class XMLDBgenerator {
}
}
/**
* Given three strings (table name, list of fields (comma separated) and suffix), create the proper object name
* quoting it if necessary
@@ -824,6 +836,22 @@ class XMLDBgenerator {
return array('Code for table drop goes to getDropTableExtraSQL(). Can be disabled with drop_table_extra_code=false;');
}
/**
* Given one XMLDBTable and one XMLDBField, return the SQL statements needded to drop its default
* (usually invoked from getModifyDefaultSQL()
*/
function getDropDefaultSQL($xmldb_table, $xmldb_field) {
return array('Code to drop one default goes to getDropDefaultSQL()');
}
/**
* Given one XMLDBTable and one XMLDBField, return the SQL statements needded to add its default
* (usually invoked from getModifyDefaultSQL()
*/
function getCreateDefaultSQL($xmldb_table, $xmldb_field) {
return array('Code to create one default goes to getCreate()');
}
/**
* Returns an array of reserved words (lowercase) for this DB
* You MUST provide the real list for each DB inside every XMLDB class
lib/xmldb/classes/generators/mssql/mssql.class.php
+62 -5
View File
@@ -157,11 +157,8 @@ class XMLDBmssql extends XMLDBgenerator {
$checkconsname = $this->getNameForObject($xmldb_table->getName(), $xmldb_field->getName(), 'ck');
/// Look for any default constraint in this field and drop it
if ($default = get_record_sql("SELECT id, object_name(cdefault) AS defaultconstraint
FROM syscolumns
WHERE id = object_id('{$tablename}') AND
name = '{$fieldname}'")) {
$results[] = 'ALTER TABLE ' . $tablename . ' DROP CONSTRAINT ' . $default->defaultconstraint;
if ($defaultname = $this->getDefaultConstraintName($xmldb_table, $xmldb_field)) {
$results[] = 'ALTER TABLE ' . $tablename . ' DROP CONSTRAINT ' . $defaultname;
}
/// Look for any check constraint in this field and drop it
@@ -186,6 +183,66 @@ class XMLDBmssql extends XMLDBgenerator {
return parent::getAlterFieldSQL($xmldb_table, $xmldb_field);
}
/**
* Given one XMLDBTable and one XMLDBField, return the SQL statements needded to create its default
* (usually invoked from getModifyDefaultSQL()
*/
function getCreateDefaultSQL($xmldb_table, $xmldb_field) {
/// This method does exactly the same than getDropDefaultSQL(), first trying to
/// drop the default if it exists and then, regenerating it, so we simply wrap over it
return $this->getDropDefaultSQL($xmldb_table, $xmldb_field);
}
/**
* Given one XMLDBTable and one XMLDBField, return the SQL statements needded to drop its default
* (usually invoked from getModifyDefaultSQL()
*/
function getDropDefaultSQL($xmldb_table, $xmldb_field) {
/// MSSQL is a bit special and it requires the corresponding DEFAULT CONSTRAINT to be dropped
$results = array();
/// Get the quoted name of the table and field
$tablename = $this->getEncQuoted($this->prefix . $xmldb_table->getName());
$fieldname = $this->getEncQuoted($xmldb_field->getName());
/// Look for the default contraint and, if found, drop it
if ($defaultname = $this->getDefaultConstraintName($xmldb_table, $xmldb_field)) {
$results[] = 'ALTER TABLE ' . $tablename . ' DROP CONSTRAINT ' . $defaultname;
}
/// Now, check if, with the current field attributes, we have to build one default
if ($default_clause = $this->getDefaultClause($xmldb_field)) {
/// We need to build the default (Moodle) default, so do it
$results[] = 'ALTER TABLE ' . $tablename . ' ADD' . $default_clause . ' FOR ' . $fieldname;
}
return $results;
}
/**
* Given one XMLDBTable and one XMLDBField, returns the name of its default constraint in DB
* or false if not found
* This function should be considered internal and never used outside from generator
*/
function getDefaultConstraintName($xmldb_table, $xmldb_field) {
global $db;
/// Get the quoted name of the table and field
$tablename = $this->getEncQuoted($this->prefix . $xmldb_table->getName());
$fieldname = $this->getEncQuoted($xmldb_field->getName());
/// Look for any default constraint in this field and drop it
if ($default = get_record_sql("SELECT id, object_name(cdefault) AS defaultconstraint
FROM syscolumns
WHERE id = object_id('{$tablename}')
AND name = '{$fieldname}'")) {
return $default->defaultconstraint;
} else {
return false;
}
}
/**
* Returns an array of reserved words (lowercase) for this DB
*/
lib/xmldb/classes/generators/mysql/mysql.class.php
+23
View File
@@ -36,6 +36,9 @@ class XMLDBmysql extends XMLDBGenerator {
var $default_for_char = ''; // To define the default to set for NOT NULLs CHARs without default (null=do nothing)
var $drop_default_clause_required = true; //To specify if the generator must use some DEFAULT clause to drop defaults
var $drop_default_clause = 'NULL'; //The DEFAULT clause required to drop defaults
var $primary_key_name = ''; //To force primary key names to one string (null=no force)
var $unique_keys = false; // Does the generator build unique key
@@ -152,6 +155,26 @@ class XMLDBmysql extends XMLDBGenerator {
return $dbtype;
}
/**
* Given one XMLDBTable and one XMLDBField, return the SQL statements needded to create its default
* (usually invoked from getModifyDefaultSQL()
*/
function getCreateDefaultSQL($xmldb_table, $xmldb_field) {
/// Just a wrapper over the getAlterFieldSQL() function for MySQL that
/// is capable of handling defaults
return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
}
/**
* Given one XMLDBTable and one XMLDBField, return the SQL statements needded to drop its default
* (usually invoked from getModifyDefaultSQL()
*/
function getDropDefaultSQL($xmldb_table, $xmldb_field) {
/// Just a wrapper over the getAlterFieldSQL() function for MySQL that
/// is capable of handling defaults
return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
}
/**
* Given one XMLDB Field, return its enum SQL
*/
lib/xmldb/classes/generators/oci8po/oci8po.class.php
+26 -2
View File
@@ -41,6 +41,9 @@ class XMLDBoci8po extends XMLDBgenerator {
var $default_for_char = ' '; // To define the default to set for NOT NULLs CHARs without default (null=do nothing)
// Using this whitespace here because Oracle doesn't distinguish empty and null! :-(
var $drop_default_clause_required = true; //To specify if the generator must use some DEFAULT clause to drop defaults
var $drop_default_clause = 'NULL'; //The DEFAULT clause required to drop defaults
var $default_after_null = false; //To decide if the default clause of each field must go after the null clause
var $unique_keys = false; // Does the generator build unique keys
@@ -232,7 +235,7 @@ class XMLDBoci8po extends XMLDBgenerator {
}
$olddecimals = empty($metac->scale) ? null : $metac->scale;
$oldnotnull = empty($metac->not_null) ? false : $metac->not_null;
$olddefault = empty($metac->default_value) ? null : $metac->default_value;
$olddefault = empty($metac->default_value) || strtoupper($metac->default_value) == 'NULL' ? null : $metac->default_value;
$typechanged = true; //By default, assume that the column type has changed
$precisionchanged = true; //By default, assume that the column precision has changed
@@ -274,6 +277,7 @@ class XMLDBoci8po extends XMLDBgenerator {
("'" . $xmldb_field->getDefault() . "'" === $olddefault)) { //Equality with quotes because ADOdb returns the default with quotes
$defaultchanged = false;
}
/// Detect if we are changing the nullability
if (($xmldb_field->getNotnull() === $oldnotnull)) {
$notnullchanged = false;
@@ -304,7 +308,7 @@ class XMLDBoci8po extends XMLDBgenerator {
/// Re-enable the notnull and default sections so the general AlterFieldSQL can use it
$this->alter_column_skip_notnull = false;
$this->alter_column_skip_default = false;
/// Dissavle the type section because we have done it with the temp field
/// Dissable the type section because we have done it with the temp field
$this->alter_column_skip_type = true;
}
@@ -342,6 +346,26 @@ class XMLDBoci8po extends XMLDBgenerator {
return $results;
}
/**
* Given one XMLDBTable and one XMLDBField, return the SQL statements needded to create its default
* (usually invoked from getModifyDefaultSQL()
*/
function getCreateDefaultSQL($xmldb_table, $xmldb_field) {
/// Just a wrapper over the getAlterFieldSQL() function for Oracle that
/// is capable of handling defaults
return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
}
/**
* Given one XMLDBTable and one XMLDBField, return the SQL statements needded to drop its default
* (usually invoked from getModifyDefaultSQL()
*/
function getDropDefaultSQL($xmldb_table, $xmldb_field) {
/// Just a wrapper over the getAlterFieldSQL() function for Oracle that
/// is capable of handling defaults
return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
}
/**
* Returns an array of reserved words (lowercase) for this DB
*/
lib/xmldb/classes/generators/postgres7/postgres7.class.php
+20
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@@ -266,6 +266,26 @@ class XMLDBpostgres7 extends XMLDBgenerator {
return $results;
}
/**
* Given one XMLDBTable and one XMLDBField, return the SQL statements needded to create its default
* (usually invoked from getModifyDefaultSQL()
*/
function getCreateDefaultSQL($xmldb_table, $xmldb_field) {
/// Just a wrapper over the getAlterFieldSQL() function for PostgreSQL that
/// is capable of handling defaults
return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
}
/**
* Given one XMLDBTable and one XMLDBField, return the SQL statements needded to drop its default
* (usually invoked from getModifyDefaultSQL()
*/
function getDropDefaultSQL($xmldb_table, $xmldb_field) {
/// Just a wrapper over the getAlterFieldSQL() function for PostgreSQL that
/// is capable of handling defaults
return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
}
/**
* Returns an array of reserved words (lowercase) for this DB
*/