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adding support for alter columns

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(not finished yet)
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stronk7 2006-09-23 21:24:51 +00:00
parent f8c485b071
commit 0e9e0b3bb3
3 changed files with 184 additions and 2 deletions
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93
lib/ddllib.php
View File

@ -390,4 +390,97 @@ function drop_field($table, $field, $continue=true, $feedback=true) {
return execute_sql_arr($sqlarr, $continue, $feedback);
}
/**
* This function will change the precision of the field in the table passed as arguments
*
* @uses $CFG, $db
* @param XMLDBTable table object (just the name is mandatory)
* @param XMLDBField field object (full specs are required)
* @param boolean continue to specify if must continue on error (true) or stop (false)
* @param boolean feedback to specify to show status info (true) or not (false)
* @return boolean true on success, false on error
*/
function change_field_precision($table, $field, $continue=true, $feedback=true) {
global $CFG, $db;
$status = true;
if (strtolower(get_class($table)) != 'xmldbtable') {
return false;
}
if (strtolower(get_class($field)) != 'xmldbfield') {
return false;
}
if(!$sqlarr = $table->getAlterFieldSQL($CFG->dbtype, $CFG->prefix, $field, false)) {
return false;
}
return execute_sql_arr($sqlarr, $continue, $feedback);
}
/**
* This function will change the unsigned/signed of the field in the table passed as arguments
*
* @uses $CFG, $db
* @param XMLDBTable table object (just the name is mandatory)
* @param XMLDBField field object (full specs are required)
* @param boolean continue to specify if must continue on error (true) or stop (false)
* @param boolean feedback to specify to show status info (true) or not (false)
* @return boolean true on success, false on error
*/
function change_field_unsigned($table, $field, $continue=true, $feedback=true) {
/// Just a wrapper over change_field_precision. Does exactly the same processing
return change_field_precision($table, $field, $continue, $feedback);
}
/**
* This function will change the nullability of the field in the table passed as arguments
*
* @uses $CFG, $db
* @param XMLDBTable table object (just the name is mandatory)
* @param XMLDBField field object (full specs are required)
* @param boolean continue to specify if must continue on error (true) or stop (false)
* @param boolean feedback to specify to show status info (true) or not (false)
* @return boolean true on success, false on error
*/
function change_field_notnull($table, $field, $continue=true, $feedback=true) {
/// Just a wrapper over change_field_precision. Does exactly the same processing
return change_field_precision($table, $field, $continue, $feedback);
}
/**
* This function will change the default of the field in the table passed as arguments
* One null value in the default field means delete the default
*
* @uses $CFG, $db
* @param XMLDBTable table object (just the name is mandatory)
* @param XMLDBField field object (full specs are required)
* @param boolean continue to specify if must continue on error (true) or stop (false)
* @param boolean feedback to specify to show status info (true) or not (false)
* @return boolean true on success, false on error
*/
function change_field_default($table, $field, $continue=true, $feedback=true) {
global $CFG, $db;
$status = true;
if (strtolower(get_class($table)) != 'xmldbtable') {
return false;
}
if (strtolower(get_class($field)) != 'xmldbfield') {
return false;
}
if(!$sqlarr = $table->getModifyDefaultSQL($CFG->dbtype, $CFG->prefix, $field, false)) {
return false;
}
return execute_sql_arr($sqlarr, $continue, $feedback);
}
?>

36
lib/xmldb/classes/XMLDBTable.class.php
View File

@ -873,6 +873,42 @@ class XMLDBTable extends XMLDBObject {
return $results;
}
/**
* This function will return the SQL code needed to alter one field in the table for the specified DB and
* prefix. Just one simple wrapper over generators.
*/
function getAlterFieldSQL ($dbtype, $prefix, $xmldb_field, $statement_end=true) {
$results = array();
$classname = 'XMLDB' . $dbtype;
$generator = new $classname();
$generator->setPrefix($prefix);
$results = $generator->getAlterFieldSQL($this, $xmldb_field);
if ($statement_end) {
$results = $generator->getEndedStatements($results);
}
return $results;
}
/**
* This function will return the SQL code needed to modify the default of one field in the table for the specified DB and
* prefix. Just one simple wrapper over generators.
*/
function getModifyDefaultSQL ($dbtype, $prefix, $xmldb_field, $statement_end=true) {
$results = array();
$classname = 'XMLDB' . $dbtype;
$generator = new $classname();
$generator->setPrefix($prefix);
$results = $generator->getModifyDefaultSQL($this, $xmldb_field);
if ($statement_end) {
$results = $generator->getEndedStatements($results);
}
return $results;
}
}
?>

57
lib/xmldb/classes/generators/XMLDBGenerator.class.php
View File

@ -93,6 +93,10 @@ class XMLDBgenerator {
var $drop_table_extra_code = false; //Does the generatos need to add code after table drop
var $alter_column_sql = 'ALTER TABLE TABLENAME ALTER COLUMN COLUMNSPECS'; //The SQL template to alter columns
var $alter_column_skip_default = false; //The generator will skip the default clause on alter columns
var $prefix; // Prefix to be used for all the DB objects
var $reserved_words; // List of reserved words (in order to quote them properly)
@ -293,7 +297,7 @@ class XMLDBgenerator {
/**
* Given one correct XMLDBField, returns the complete SQL line to create it
*/
function getFieldSQL($xmldb_field) {
function getFieldSQL($xmldb_field, $skip_default_clause = false) {
/// First of all, convert integers to numbers if defined
if ($this->integer_to_number) {
@ -335,7 +339,11 @@ class XMLDBgenerator {
}
}
/// Calculate the default clause
$default = $this->getDefaultClause($xmldb_field);
if (!$skip_default_clause) { //Only if we don't want to skip it
$default = $this->getDefaultClause($xmldb_field);
} else {
$default = '';
}
/// Based on default_after_null, set both clauses properly
if ($this->default_after_null) {
$field .= $notnull . $default;
@ -522,6 +530,51 @@ class XMLDBgenerator {
return $results;
}
/**
* Given one XMLDBTable and one XMLDBField, return the SQL statements needded to alter the field in the table
*/
function getAlterFieldSQL($xmldb_table, $xmldb_field) {
$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());
/// Build de alter sentence using the alter_column_sql template
$alter = str_replace('TABLENAME', $this->getEncQuoted($this->prefix . $xmldb_table->getName()), $this->alter_column_sql);
$alter = str_replace('COLUMNSPECS', $this->getFieldSQL($xmldb_field, $this->alter_column_skip_default), $alter);
/// Build the standard alter table modify
$results[] = $alter;
/// Add the after clause if necesary
if ($this->add_after_clause && $xmldb_field->getPrevious()) {
$altertable .= ' after ' . $this->getEncQuoted($xmldb_field->getPrevious());
}
return $results;
}
/**
* Given one XMLDBTable and one XMLDBField, return the SQL statements needded to modify the default of the field in the table
*/
function getModifyDefaultSQL($xmldb_table, $xmldb_field) {
$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());
/// Decide if we are going to create/modify or to drop the default
if ($xmldb_field->getDefault() === null) {
return $this->getDropDefaultSQL($xmldb_table, $xmldb_field); //Drop
} else {
return $this->getCreateDefaultSQL($xmldb_table, $xmldb_field); //Create/modify
}
}
/**
* Given three strings (table name, list of fields (comma separated) and suffix), create the proper object name
* quoting it if necessary