com.github.pagehelper.parser

Class CountSqlParser

java.lang.Object

com.github.pagehelper.parser.CountSqlParser

public class CountSqlParser
extends Object

sql解析类，提供更智能的count查询sql

Author:

liuzh

Field Summary

Fields

Modifier and Type	Field and Description
static String	KEEP_ORDERBY

Constructor Summary

Constructors

Constructor and Description
CountSqlParser()
CountSqlParser(JSqlParser jSqlParser)

Method Summary

Modifier and Type	Method and Description
static void	addAggregateFunctions(String functions) 添加到聚合函数，可以是逗号隔开的多个函数前缀
String	getSimpleCountSql(String sql) 获取普通的Count-sql
String	getSimpleCountSql(String sql, String name) 获取普通的Count-sql
String	getSmartCountSql(String sql) 获取智能的countSql
String	getSmartCountSql(String sql, String countColumn) 获取智能的countSql
boolean	isSimpleCount(net.sf.jsqlparser.statement.select.PlainSelect select) 是否可以用简单的count查询方式
protected boolean	keepOrderBy() 保留 order by
protected boolean	keepSubSelectOrderBy() 保留子查询 order by
boolean	orderByHashParameters(List<net.sf.jsqlparser.statement.select.OrderByElement> orderByElements) 判断Orderby是否包含参数，有参数的不能去
void	processFromItem(net.sf.jsqlparser.statement.select.FromItem fromItem) 处理子查询
void	processPlainSelect(net.sf.jsqlparser.statement.select.PlainSelect plainSelect) 处理PlainSelect类型的selectBody
void	processSelectBody(net.sf.jsqlparser.statement.select.SelectBody selectBody) 处理selectBody去除Order by
void	processWithItemsList(List<net.sf.jsqlparser.statement.select.WithItem> withItemsList) 处理WithItem
void	sqlToCount(net.sf.jsqlparser.statement.select.Select select, String name) 将sql转换为count查询

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

KEEP_ORDERBY

public static final String KEEP_ORDERBY

See Also:

Constant Field Values

Constructor Detail

CountSqlParser

public CountSqlParser()

CountSqlParser

public CountSqlParser(JSqlParser jSqlParser)

Method Detail

addAggregateFunctions

public static void addAggregateFunctions(String functions)

添加到聚合函数，可以是逗号隔开的多个函数前缀

Parameters:

functions -

getSmartCountSql

public String getSmartCountSql(String sql)

获取智能的countSql

Parameters:

sql -

Returns:

getSmartCountSql

public String getSmartCountSql(String sql,
                               String countColumn)

获取智能的countSql

Parameters:

sql -

countColumn - 列名，默认 0

Returns:

getSimpleCountSql

public String getSimpleCountSql(String sql)

获取普通的Count-sql

Parameters:

sql - 原查询sql

Returns:

返回count查询sql

getSimpleCountSql

public String getSimpleCountSql(String sql,
                                String name)

获取普通的Count-sql

Parameters:

sql - 原查询sql

Returns:

返回count查询sql

sqlToCount

public void sqlToCount(net.sf.jsqlparser.statement.select.Select select,
                       String name)

将sql转换为count查询

Parameters:

select -

isSimpleCount

public boolean isSimpleCount(net.sf.jsqlparser.statement.select.PlainSelect select)

是否可以用简单的count查询方式

Parameters:

select -

Returns:

processSelectBody

public void processSelectBody(net.sf.jsqlparser.statement.select.SelectBody selectBody)

处理selectBody去除Order by

Parameters:

selectBody -

processPlainSelect

public void processPlainSelect(net.sf.jsqlparser.statement.select.PlainSelect plainSelect)

处理PlainSelect类型的selectBody

Parameters:

plainSelect -

processWithItemsList

public void processWithItemsList(List<net.sf.jsqlparser.statement.select.WithItem> withItemsList)

处理WithItem

Parameters:

withItemsList -

processFromItem

public void processFromItem(net.sf.jsqlparser.statement.select.FromItem fromItem)

处理子查询

Parameters:

fromItem -

keepOrderBy

protected boolean keepOrderBy()

保留 order by

keepSubSelectOrderBy

protected boolean keepSubSelectOrderBy()

保留子查询 order by

orderByHashParameters

public boolean orderByHashParameters(List<net.sf.jsqlparser.statement.select.OrderByElement> orderByElements)

判断Orderby是否包含参数，有参数的不能去

Parameters:

orderByElements -

Returns: