CMssqlCommandBuilder
包 | system.db.schema.mssql |
---|---|
继承 | class CMssqlCommandBuilder » CDbCommandBuilder » CComponent |
可用自 | 1.0.4 |
版本 | $Id$ |
公共属性
属性 | 类型 | 描述 | 被定义在 |
---|---|---|---|
dbConnection | CDbConnection | database connection. | CDbCommandBuilder |
schema | CDbSchema | the schema for this command builder. | CDbCommandBuilder |
公共方法
方法 | 描述 | 被定义在 |
---|---|---|
__call() | Calls the named method which is not a class method. | CComponent |
__construct() | CDbCommandBuilder | |
__get() | Returns a property value, an event handler list or a behavior based on its name. | CComponent |
__isset() | Checks if a property value is null. | CComponent |
__set() | Sets value of a component property. | CComponent |
__unset() | Sets a component property to be null. | CComponent |
applyCondition() | Alters the SQL to apply WHERE clause. | CDbCommandBuilder |
applyGroup() | Alters the SQL to apply GROUP BY. | CDbCommandBuilder |
applyHaving() | Alters the SQL to apply HAVING. | CDbCommandBuilder |
applyJoin() | Alters the SQL to apply JOIN clause. | CDbCommandBuilder |
applyLimit() | This is a port from Prado Framework. | CMssqlCommandBuilder |
applyOrder() | Alters the SQL to apply ORDER BY. | CDbCommandBuilder |
asa() | Returns the named behavior object. | CComponent |
attachBehavior() | Attaches a behavior to this component. | CComponent |
attachBehaviors() | Attaches a list of behaviors to the component. | CComponent |
attachEventHandler() | Attaches an event handler to an event. | CComponent |
bindValues() | Binds parameter values for an SQL command. | CDbCommandBuilder |
canGetProperty() | Determines whether a property can be read. | CComponent |
canSetProperty() | Determines whether a property can be set. | CComponent |
createColumnCriteria() | Creates a query criteria with the specified column values. | CDbCommandBuilder |
createCountCommand() | Creates a COUNT(*) command for a single table. | CMssqlCommandBuilder |
createCriteria() | Creates a query criteria. | CDbCommandBuilder |
createDeleteCommand() | Creates a DELETE command. | CMssqlCommandBuilder |
createFindCommand() | Creates a SELECT command for a single table. | CMssqlCommandBuilder |
createInCondition() | Generates the expression for selecting rows of specified primary key values. | CDbCommandBuilder |
createInsertCommand() | Creates an INSERT command. | CDbCommandBuilder |
createPkCondition() | Generates the expression for selecting rows of specified primary key values. | CDbCommandBuilder |
createPkCriteria() | Creates a query criteria with the specified primary key. | CDbCommandBuilder |
createSearchCondition() | Generates the expression for searching the specified keywords within a list of columns. | CDbCommandBuilder |
createSqlCommand() | Creates a command based on a given SQL statement. | CDbCommandBuilder |
createUpdateCommand() | Creates an UPDATE command. | CMssqlCommandBuilder |
createUpdateCounterCommand() | Creates an UPDATE command that increments/decrements certain columns. | CMssqlCommandBuilder |
detachBehavior() | Detaches a behavior from the component. | CComponent |
detachBehaviors() | Detaches all behaviors from the component. | CComponent |
detachEventHandler() | Detaches an existing event handler. | CComponent |
disableBehavior() | Disables an attached behavior. | CComponent |
disableBehaviors() | Disables all behaviors attached to this component. | CComponent |
enableBehavior() | Enables an attached behavior. | CComponent |
enableBehaviors() | Enables all behaviors attached to this component. | CComponent |
getDbConnection() | CDbCommandBuilder | |
getEventHandlers() | Returns the list of attached event handlers for an event. | CComponent |
getLastInsertID() | Returns the last insertion ID for the specified table. | CMssqlCommandBuilder |
getSchema() | CDbCommandBuilder | |
hasEvent() | Determines whether an event is defined. | CComponent |
hasEventHandler() | Checks whether the named event has attached handlers. | CComponent |
hasProperty() | Determines whether a property is defined. | CComponent |
raiseEvent() | Raises an event. | CComponent |
受保护的方法
方法 | 描述 | 被定义在 |
---|---|---|
checkCriteria() | Checks if the criteria has an order by clause when using offset/limit. | CMssqlCommandBuilder |
createCompositeInCondition() | Generates the expression for selecting rows with specified composite key values. | CDbCommandBuilder |
ensureTable() | Checks if the parameter is a valid table schema. | CDbCommandBuilder |
findOrdering() | Base on simplified syntax http://msdn2.microsoft.com/en-us/library/aa259187(SQL.80).aspx | CMssqlCommandBuilder |
joinOrdering() | CMssqlCommandBuilder | |
reverseDirection() | CMssqlCommandBuilder | |
rewriteLimitOffsetSql() | Rewrite sql to apply $limit > and $offset > 0 for MSSQL database. | CMssqlCommandBuilder |
方法详情
public string applyLimit(string $sql, integer $limit, integer $offset)
| ||
$sql | string | SQL query string. |
$limit | integer | maximum number of rows, -1 to ignore limit. |
$offset | integer | row offset, -1 to ignore offset. |
{return} | string | SQL with limit and offset. |
This is a port from Prado Framework.
Overrides parent implementation. Alters the sql to apply $limit and $offset.
The idea for limit with offset is done by modifying the sql on the fly
with numerous assumptions on the structure of the sql string.
The modification is done with reference to the notes from
http://troels.arvin.dk/db/rdbms/#select-limit-offset
SELECT * FROM (
SELECT TOP n * FROM (
SELECT TOP z columns -- (z=n+skip)
FROM tablename
ORDER BY key ASC
) AS FOO ORDER BY key DESC -- ('FOO' may be anything)
) AS BAR ORDER BY key ASC -- ('BAR' may be anything)
Regular expressions are used to alter the SQL query. The resulting SQL query
may be malformed for complex queries. The following restrictions apply
- In particular, commas should NOT be used as part of the ordering expression or identifier. Commas must only be used for separating the ordering clauses.
- In the ORDER BY clause, the column name should NOT be be qualified with a table name or view name. Alias the column names or use column index.
- No clauses should follow the ORDER BY clause, e.g. no COMPUTE or FOR clauses.
protected CDbCrireria checkCriteria(CMssqlTableSchema $table, CDbCriteria $criteria)
| ||
$table | CMssqlTableSchema | table schema |
$criteria | CDbCriteria | criteria |
{return} | CDbCrireria | the modified criteria |
Checks if the criteria has an order by clause when using offset/limit. Override parent implementation to check if an orderby clause if specified when querying with an offset If not, order it by pk.
$table | CDbTableSchema | the table metadata |
$criteria | CDbCriteria | the query criteria |
{return} | CDbCommand | query command. |
Creates a COUNT(*) command for a single table. Override parent implementation to remove the order clause of criteria if it exists
$table | CDbTableSchema | the table metadata |
$criteria | CDbCriteria | the query criteria |
{return} | CDbCommand | delete command. |
Creates a DELETE command. Override parent implementation to check if an orderby clause if specified when querying with an offset
$table | CDbTableSchema | the table metadata |
$criteria | CDbCriteria | the query criteria |
{return} | CDbCommand | query command. |
Creates a SELECT command for a single table. Override parent implementation to check if an orderby clause if specified when querying with an offset
$table | CDbTableSchema | the table metadata |
$data | array | list of columns to be updated (name=>value) |
$criteria | CDbCriteria | the query criteria |
{return} | CDbCommand | update command. |
Creates an UPDATE command. Override parent implementation because mssql don't want to update an identity column
public CDbCommand createUpdateCounterCommand(CDbTableSchema $table, CDbCriteria $counters, array $criteria)
| ||
$table | CDbTableSchema | the table metadata |
$counters | CDbCriteria | the query criteria |
$criteria | array | counters to be updated (counter increments/decrements indexed by column names.) |
{return} | CDbCommand | the created command |
Creates an UPDATE command that increments/decrements certain columns. Override parent implementation to check if an orderby clause if specified when querying with an offset
protected array findOrdering(string $sql)
| ||
$sql | string | $sql |
{return} | array | ordering expression as key and ordering direction as value |
Base on simplified syntax http://msdn2.microsoft.com/en-us/library/aa259187(SQL.80).aspx
public mixed getLastInsertID(CDbTableSchema $table)
| ||
$table | CDbTableSchema | the table metadata |
{return} | mixed | last insertion id. Null is returned if no sequence name. |
Returns the last insertion ID for the specified table. Override parent implemantation since PDO mssql driver does not provide this method
protected string joinOrdering(array $orders)
| ||
$orders | array | ordering obtained from findOrdering() |
{return} | string | concat the orderings |
protected array reverseDirection(array $orders)
| ||
$orders | array | original ordering |
{return} | array | ordering with reversed direction. |
protected sql rewriteLimitOffsetSql(string $sql, integer $limit, integer $offset)
| ||
$sql | string | sql query |
$limit | integer | $limit > 0 |
$offset | integer | $offset > 0 |
{return} | sql | modified sql query applied with limit and offset. |
Rewrite sql to apply $limit > and $offset > 0 for MSSQL database. See http://troels.arvin.dk/db/rdbms/#select-limit-offset