com.github.pagehelper.parser

Class SqlServerParser

java.lang.Object

com.github.pagehelper.parser.SqlServerParser

public class SqlServerParser
extends Object

将sqlserver查询语句转换为分页语句
注意事项：

1. 请先保证你的SQL可以执行
2. sql中最好直接包含order by，可以自动从sql提取
3. 如果没有order by，可以通过入参提供，但是需要自己保证正确
4. 如果sql有order by，可以通过orderby参数覆盖sql中的order by
5. order by的列名不能使用别名
6. 表和列使用别名的时候不要使用单引号(')

该类设计为一个独立的工具类，依赖jsqlparser,可以独立使用

Author:

liuzh

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	PAGE_COLUMN_ALIAS_PREFIX
protected static String	PAGE_ROW_NUMBER
protected static net.sf.jsqlparser.schema.Column	PAGE_ROW_NUMBER_COLUMN
static String	PAGE_SIZE
static net.sf.jsqlparser.expression.Alias	PAGE_TABLE_ALIAS
protected static String	PAGE_TABLE_NAME
static String	START_ROW
protected static net.sf.jsqlparser.statement.select.Top	TOP100_PERCENT
protected static String	WRAP_TABLE

Constructor Summary

Constructors

Constructor and Description
SqlServerParser()

Method Summary

Modifier and Type	Method and Description
protected net.sf.jsqlparser.statement.select.SelectItem	addRowNumber(net.sf.jsqlparser.statement.select.PlainSelect plainSelect, List<net.sf.jsqlparser.statement.select.SelectItem> autoItems) 获取 ROW_NUMBER() 列
protected net.sf.jsqlparser.statement.select.OrderByElement	cloneOrderByElement(net.sf.jsqlparser.statement.select.OrderByElement orig, net.sf.jsqlparser.expression.Expression expression) 复制 OrderByElement
protected net.sf.jsqlparser.statement.select.OrderByElement	cloneOrderByElement(net.sf.jsqlparser.statement.select.OrderByElement orig, String alias) 复制 OrderByElement
String	convertToPageSql(String sql) 转换为分页语句
String	convertToPageSql(String sql, Integer offset, Integer limit) 转换为分页语句
protected List<net.sf.jsqlparser.statement.select.OrderByElement>	getOrderByElements(net.sf.jsqlparser.statement.select.PlainSelect plainSelect, List<net.sf.jsqlparser.statement.select.SelectItem> autoItems) 获取新的排序列表
protected net.sf.jsqlparser.statement.select.Select	getPageSelect(net.sf.jsqlparser.statement.select.Select select) 获取一个外层包装的TOP查询
protected List<net.sf.jsqlparser.statement.select.SelectItem>	getSelectItems(net.sf.jsqlparser.statement.select.PlainSelect plainSelect) 获取查询列
boolean	isNotEmptyList(List<?> list) List不空
protected void	processFromItem(net.sf.jsqlparser.statement.select.FromItem fromItem, int level) 处理子查询
protected void	processPlainSelect(net.sf.jsqlparser.statement.select.PlainSelect plainSelect, int level) 处理PlainSelect类型的selectBody
protected void	processSelectBody(net.sf.jsqlparser.statement.select.SelectBody selectBody, int level) 处理selectBody去除Order by
protected net.sf.jsqlparser.statement.select.SelectBody	wrapSetOperationList(net.sf.jsqlparser.statement.select.SetOperationList setOperationList) 包装SetOperationList

Methods inherited from class java.lang.Object

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

Field Detail

START_ROW

public static final String START_ROW

PAGE_SIZE

public static final String PAGE_SIZE

WRAP_TABLE

protected static final String WRAP_TABLE

See Also:

Constant Field Values

PAGE_TABLE_NAME

protected static final String PAGE_TABLE_NAME

See Also:

Constant Field Values

PAGE_TABLE_ALIAS

public static final net.sf.jsqlparser.expression.Alias PAGE_TABLE_ALIAS

PAGE_ROW_NUMBER

protected static final String PAGE_ROW_NUMBER

See Also:

Constant Field Values

PAGE_ROW_NUMBER_COLUMN

protected static final net.sf.jsqlparser.schema.Column PAGE_ROW_NUMBER_COLUMN

TOP100_PERCENT

protected static final net.sf.jsqlparser.statement.select.Top TOP100_PERCENT

PAGE_COLUMN_ALIAS_PREFIX

protected static final String PAGE_COLUMN_ALIAS_PREFIX

See Also:

Constant Field Values

Constructor Detail

SqlServerParser

public SqlServerParser()

Method Detail

convertToPageSql

public String convertToPageSql(String sql)

转换为分页语句

Parameters:

sql -

Returns:

convertToPageSql

public String convertToPageSql(String sql,
                               Integer offset,
                               Integer limit)

转换为分页语句

Parameters:

sql -

offset -

limit -

Returns:

getPageSelect

protected net.sf.jsqlparser.statement.select.Select getPageSelect(net.sf.jsqlparser.statement.select.Select select)

获取一个外层包装的TOP查询

Parameters:

select -

Returns:

wrapSetOperationList

protected net.sf.jsqlparser.statement.select.SelectBody wrapSetOperationList(net.sf.jsqlparser.statement.select.SetOperationList setOperationList)

包装SetOperationList

Parameters:

setOperationList -

Returns:

getSelectItems

protected List<net.sf.jsqlparser.statement.select.SelectItem> getSelectItems(net.sf.jsqlparser.statement.select.PlainSelect plainSelect)

获取查询列

Parameters:

plainSelect -

Returns:

addRowNumber

protected net.sf.jsqlparser.statement.select.SelectItem addRowNumber(net.sf.jsqlparser.statement.select.PlainSelect plainSelect,
                                                                     List<net.sf.jsqlparser.statement.select.SelectItem> autoItems)

获取 ROW_NUMBER() 列

Parameters:

plainSelect - 原查询

autoItems - 自动生成的查询列

Returns:

ROW_NUMBER() 列

processSelectBody

protected void processSelectBody(net.sf.jsqlparser.statement.select.SelectBody selectBody,
                                 int level)

处理selectBody去除Order by

Parameters:

selectBody -

processPlainSelect

protected void processPlainSelect(net.sf.jsqlparser.statement.select.PlainSelect plainSelect,
                                  int level)

处理PlainSelect类型的selectBody

Parameters:

plainSelect -

processFromItem

protected void processFromItem(net.sf.jsqlparser.statement.select.FromItem fromItem,
                               int level)

处理子查询

Parameters:

fromItem -

isNotEmptyList

public boolean isNotEmptyList(List<?> list)

List不空

Parameters:

list -

Returns:

cloneOrderByElement

protected net.sf.jsqlparser.statement.select.OrderByElement cloneOrderByElement(net.sf.jsqlparser.statement.select.OrderByElement orig,
                                                                                String alias)

复制 OrderByElement

Parameters:

orig - 原 OrderByElement

alias - 新 OrderByElement 的排序要素

Returns:

复制的新 OrderByElement

cloneOrderByElement

protected net.sf.jsqlparser.statement.select.OrderByElement cloneOrderByElement(net.sf.jsqlparser.statement.select.OrderByElement orig,
                                                                                net.sf.jsqlparser.expression.Expression expression)

复制 OrderByElement

Parameters:

orig - 原 OrderByElement

expression - 新 OrderByElement 的排序要素

Returns:

复制的新 OrderByElement

getOrderByElements

protected List<net.sf.jsqlparser.statement.select.OrderByElement> getOrderByElements(net.sf.jsqlparser.statement.select.PlainSelect plainSelect,
                                                                                     List<net.sf.jsqlparser.statement.select.SelectItem> autoItems)

获取新的排序列表

Parameters:

plainSelect - 原始查询

autoItems - 生成的新查询要素

Returns:

新的排序列表