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dell
2017-12-29 16:18:40 +08:00
commit 0788f42ae7
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53
src/main/java/com/nis/persistence/dialect/ClusterDialect.java Normal file
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/**
* Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.nis.persistence.dialect;
/**
* Cluster方言的实现[神通数据库]
*
* @author poplar.yfyang
* @version 1.0 2010-10-10 下午12:31
* @since JDK 1.5
*/
public class ClusterDialect implements Dialect {
@Override
public String getLimitString(String sql, int offset, int limit) {
return getLimitString(sql, offset, Integer.toString(offset),
Integer.toString(limit));
}
public boolean supportsLimit() {
return true;
}
/**
* 将sql变成分页sql语句,提供将offset及limit使用占位符号(placeholder)替换.
* <pre>
* 如mysql
* dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
* select * from user limit :offset,:limit
* </pre>
*
* @param sql 实际SQL语句
* @param offset 分页开始纪录条数
* @param offsetPlaceholder 分页开始纪录条数－占位符号
* @param limitPlaceholder 分页纪录条数占位符号
* @return 包含占位符的分页sql
*/
public String getLimitString(String sql, int offset, String offsetPlaceholder, String limitPlaceholder) {
StringBuilder stringBuilder = new StringBuilder(sql);
if(stringBuilder.indexOf("limit") == -1 && stringBuilder.indexOf("LIMIT") == -1 ){
stringBuilder.append(" limit ");
stringBuilder.append(limitPlaceholder);
stringBuilder.append(" offset ");
stringBuilder.append(offsetPlaceholder);
}
System.out.println("cluster分页sql："+stringBuilder.toString());
return stringBuilder.toString();
}
}

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src/main/java/com/nis/persistence/dialect/DB2Dialect.java Normal file
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/**
* Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.nis.persistence.dialect;
/**
* DB2的分页数据库方言实现
*
* @author poplar.yfyang
* @version 1.0 2010-10-10 下午12:31
* @since JDK 1.5
*/
public class DB2Dialect implements Dialect {
@Override
public boolean supportsLimit() {
return true;
}
private static String getRowNumber(String sql) {
StringBuilder rownumber = new StringBuilder(50)
.append("rownumber() over(");
int orderByIndex = sql.toLowerCase().indexOf("order by");
if (orderByIndex > 0 && !hasDistinct(sql)) {
rownumber.append(sql.substring(orderByIndex));
}
rownumber.append(") as rownumber_,");
return rownumber.toString();
}
private static boolean hasDistinct(String sql) {
return sql.toLowerCase().contains("select distinct");
}
@Override
public String getLimitString(String sql, int offset, int limit) {
return getLimitString(sql, offset, Integer.toString(offset), Integer.toString(limit));
}
/**
* 将sql变成分页sql语句,提供将offset及limit使用占位符号(placeholder)替换.
* <pre>
* 如mysql
* dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
* select * from user limit :offset,:limit
* </pre>
*
* @param sql 实际SQL语句
* @param offset 分页开始纪录条数
* @param offsetPlaceholder 分页开始纪录条数－占位符号
* @param limitPlaceholder 分页纪录条数占位符号
* @return 包含占位符的分页sql
*/
public String getLimitString(String sql, int offset, String offsetPlaceholder, String limitPlaceholder) {
int startOfSelect = sql.toLowerCase().indexOf("select");
StringBuilder pagingSelect = new StringBuilder(sql.length() + 100)
.append(sql.substring(0, startOfSelect)) //add the comment
.append("select * from ( select ") //nest the main query in an outer select
.append(getRowNumber(sql)); //add the rownnumber bit into the outer query select list
if (hasDistinct(sql)) {
pagingSelect.append(" row_.* from ( ") //add another (inner) nested select
.append(sql.substring(startOfSelect)) //add the main query
.append(" ) as row_"); //close off the inner nested select
} else {
pagingSelect.append(sql.substring(startOfSelect + 6)); //add the main query
}
pagingSelect.append(" ) as temp_ where rownumber_ ");
//add the restriction to the outer select
if (offset > 0) {
// int end = offset + limit;
String endString = offsetPlaceholder + "+" + limitPlaceholder;
pagingSelect.append("between ").append(offsetPlaceholder)
.append("+1 and ").append(endString);
} else {
pagingSelect.append("<= ").append(limitPlaceholder);
}
return pagingSelect.toString();
}
}

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src/main/java/com/nis/persistence/dialect/DerbyDialect.java Normal file
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/**
* Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.nis.persistence.dialect;
/**
* @author poplar.yfyang
* @version 1.0 2010-10-10 下午12:31
* @since JDK 1.5
*/
public class DerbyDialect implements Dialect {
@Override
public boolean supportsLimit() {
return false;
}
@Override
public String getLimitString(String sql, int offset, int limit) {
// return getLimitString(sql,offset,Integer.toString(offset),limit,Integer.toString(limit));
throw new UnsupportedOperationException("paged queries not supported");
}
/**
* 将sql变成分页sql语句,提供将offset及limit使用占位符号(placeholder)替换.
* <pre>
* 如mysql
* dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
* select * from user limit :offset,:limit
* </pre>
*
* @param sql 实际SQL语句
* @param offset 分页开始纪录条数
* @param offsetPlaceholder 分页开始纪录条数－占位符号
* @param limit 分页每页显示纪录条数
* @param limitPlaceholder 分页纪录条数占位符号
* @return 包含占位符的分页sql
*/
public String getLimitString(String sql, int offset,String offsetPlaceholder, int limit, String limitPlaceholder) {
throw new UnsupportedOperationException( "paged queries not supported" );
}
}

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src/main/java/com/nis/persistence/dialect/Dialect.java Normal file
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/**
* Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.nis.persistence.dialect;
/**
* 类似hibernate的Dialect,但只精简出分页部分
*
* @author poplar.yfyang
* @version 1.0 2011-11-18 下午12:31
* @since JDK 1.5
*/
public interface Dialect {
/**
* 数据库本身是否支持分页当前的分页查询方式
* 如果数据库不支持的话，则不进行数据库分页
*
* @return true：支持当前的分页查询方式
*/
public boolean supportsLimit();
/**
* 将sql转换为分页SQL，分别调用分页sql
*
* @param sql SQL语句
* @param offset 开始条数
* @param limit 每页显示多少纪录条数
* @return 分页查询的sql
*/
public String getLimitString(String sql, int offset, int limit);
}

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src/main/java/com/nis/persistence/dialect/H2Dialect.java Normal file
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/**
* Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.nis.persistence.dialect;
/**
* A dialect compatible with the H2 database.
*
* @author poplar.yfyang
* @version 1.0 2010-10-10 下午12:31
* @since JDK 1.5
*/
public class H2Dialect implements Dialect {
public boolean supportsLimit() {
return true;
}
/**
* 将sql变成分页sql语句,提供将offset及limit使用占位符号(placeholder)替换.
* <pre>
* 如mysql
* dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
* select * from user limit :offset,:limit
* </pre>
*
* @param sql 实际SQL语句
* @param offset 分页开始纪录条数
* @param offsetPlaceholder 分页开始纪录条数－占位符号
* @param limit 分页每页显示纪录条数
* @param limitPlaceholder 分页纪录条数占位符号
* @return 包含占位符的分页sql
*/
private String getLimitString(String sql, int offset, String offsetPlaceholder, int limit, String limitPlaceholder) {
return sql + ((offset > 0) ? " limit " + limitPlaceholder + " offset "
+ offsetPlaceholder : " limit " + limitPlaceholder);
}
@Override
public String getLimitString(String sql, int offset, int limit) {
return getLimitString(sql, offset, Integer.toString(offset), limit, Integer.toString(limit));
}
}

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src/main/java/com/nis/persistence/dialect/HSQLDialect.java Normal file
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/**
* Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.nis.persistence.dialect;
/**
* Dialect for HSQLDB
*
* @author poplar.yfyang
* @version 1.0 2010-10-10 下午12:31
* @since JDK 1.5
*/
public class HSQLDialect implements Dialect {
@Override
public boolean supportsLimit() {
return true;
}
@Override
public String getLimitString(String sql, int offset, int limit) {
return getLimitString(sql, offset, Integer.toString(offset),
Integer.toString(limit));
}
/**
* 将sql变成分页sql语句,提供将offset及limit使用占位符号(placeholder)替换.
* <pre>
* 如mysql
* dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
* select * from user limit :offset,:limit
* </pre>
*
* @param sql 实际SQL语句
* @param offset 分页开始纪录条数
* @param offsetPlaceholder 分页开始纪录条数－占位符号
* @param limitPlaceholder 分页纪录条数占位符号
* @return 包含占位符的分页sql
*/
public String getLimitString(String sql, int offset, String offsetPlaceholder, String limitPlaceholder) {
boolean hasOffset = offset > 0;
return
new StringBuffer(sql.length() + 10)
.append(sql)
.insert(sql.toLowerCase().indexOf("select") + 6, hasOffset ? " limit " + offsetPlaceholder + " " + limitPlaceholder : " top " + limitPlaceholder)
.toString();
}
}

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src/main/java/com/nis/persistence/dialect/MySQLDialect.java Normal file
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/**
* Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.nis.persistence.dialect;
/**
* Mysql方言的实现
*
* @author poplar.yfyang
* @version 1.0 2010-10-10 下午12:31
* @since JDK 1.5
*/
public class MySQLDialect implements Dialect {
@Override
public String getLimitString(String sql, int offset, int limit) {
return getLimitString(sql, offset, Integer.toString(offset),
Integer.toString(limit));
}
public boolean supportsLimit() {
return true;
}
/**
* 将sql变成分页sql语句,提供将offset及limit使用占位符号(placeholder)替换.
* <pre>
* 如mysql
* dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
* select * from user limit :offset,:limit
* </pre>
*
* @param sql 实际SQL语句
* @param offset 分页开始纪录条数
* @param offsetPlaceholder 分页开始纪录条数－占位符号
* @param limitPlaceholder 分页纪录条数占位符号
* @return 包含占位符的分页sql
*/
public String getLimitString(String sql, int offset, String offsetPlaceholder, String limitPlaceholder) {
StringBuilder stringBuilder = new StringBuilder(sql);
stringBuilder.append(" limit ");
if (offset > 0) {
stringBuilder.append(offsetPlaceholder).append(",").append(limitPlaceholder);
} else {
stringBuilder.append(limitPlaceholder);
}
return stringBuilder.toString();
}
}

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src/main/java/com/nis/persistence/dialect/OracleDialect.java Normal file
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/**
* Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.nis.persistence.dialect;
/**
* Oracle的方言实现
* @author poplar.yfyang
* @version 1.0 2010-10-10 下午12:31
* @since JDK 1.5
*/
public class OracleDialect implements Dialect {
@Override
public boolean supportsLimit() {
return true;
}
@Override
public String getLimitString(String sql, int offset, int limit) {
return getLimitString(sql, offset, Integer.toString(offset), Integer.toString(limit));
}
/**
* 将sql变成分页sql语句,提供将offset及limit使用占位符号(placeholder)替换.
* <pre>
* 如mysql
* dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
* select * from user limit :offset,:limit
* </pre>
*
* @param sql 实际SQL语句
* @param offset 分页开始纪录条数
* @param offsetPlaceholder 分页开始纪录条数－占位符号
* @param limitPlaceholder 分页纪录条数占位符号
* @return 包含占位符的分页sql
*/
public String getLimitString(String sql, int offset, String offsetPlaceholder, String limitPlaceholder) {
sql = sql.trim();
boolean isForUpdate = false;
if (sql.toLowerCase().endsWith(" for update")) {
sql = sql.substring(0, sql.length() - 11);
isForUpdate = true;
}
StringBuilder pagingSelect = new StringBuilder(sql.length() + 100);
if (offset > 0) {
pagingSelect.append("select * from ( select row_.*, rownum rownum_ from ( ");
} else {
pagingSelect.append("select * from ( ");
}
pagingSelect.append(sql);
if (offset > 0) {
String endString = offsetPlaceholder + "+" + limitPlaceholder;
pagingSelect.append(" ) row_ where rownum <= "+endString+") where rownum_ > ").append(offsetPlaceholder);
} else {
pagingSelect.append(" ) where rownum <= "+limitPlaceholder);
}
if (isForUpdate) {
pagingSelect.append(" for update");
}
return pagingSelect.toString();
}
}

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src/main/java/com/nis/persistence/dialect/PostgreSQLDialect.java Normal file
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/**
* Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.nis.persistence.dialect;
/**
* Postgre Sql的方言实现
* @author poplar.yfyang
* @version 1.0 2010-10-10 下午12:31
* @since JDK 1.5
*/
public class PostgreSQLDialect implements Dialect {
public boolean supportsLimit() {
return true;
}
@Override
public String getLimitString(String sql, int offset, int limit) {
return getLimitString(sql, offset, Integer.toString(offset),
Integer.toString(limit));
}
/**
* 将sql变成分页sql语句,提供将offset及limit使用占位符号(placeholder)替换.
* <pre>
* 如mysql
* dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
* select * from user limit :offset,:limit
* </pre>
*
* @param sql 实际SQL语句
* @param offset 分页开始纪录条数
* @param offsetPlaceholder 分页开始纪录条数－占位符号
* @param limitPlaceholder 分页纪录条数占位符号
* @return 包含占位符的分页sql
*/
public String getLimitString(String sql, int offset,
String offsetPlaceholder, String limitPlaceholder) {
StringBuilder pageSql = new StringBuilder().append(sql);
pageSql = offset <= 0
? pageSql.append(" limit ").append(limitPlaceholder) :
pageSql.append(" limit ").append(limitPlaceholder).append(" offset ").append(offsetPlaceholder);
return pageSql.toString();
}
}

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src/main/java/com/nis/persistence/dialect/SQLServer2005Dialect.java Normal file
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/**
* Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.nis.persistence.dialect;
import org.apache.commons.lang3.StringUtils;
/**
* Sql 2005的方言实现
* @author poplar.yfyang
* @version 1.0 2010-10-10 下午12:31
* @since JDK 1.5
*/
public class SQLServer2005Dialect implements Dialect {
@Override
public boolean supportsLimit() {
return true;
}
@Override
public String getLimitString(String sql, int offset, int limit) {
return getLimitString(sql, offset,
limit, Integer.toString(limit));
}
/**
* Add a LIMIT clause to the given SQL SELECT
* <p/>
* The LIMIT SQL will look like:
* <p/>
* WITH query AS
* (SELECT TOP 100 percent ROW_NUMBER() OVER (ORDER BY CURRENT_TIMESTAMP) as __row_number__, * from table_name)
* SELECT *
* FROM query
* WHERE __row_number__ BETWEEN :offset and :lastRows
* ORDER BY __row_number__
*
* @param querySqlString The SQL statement to base the limit query off of.
* @param offset Offset of the first row to be returned by the query (zero-based)
* @param limit Maximum number of rows to be returned by the query
* @param limitPlaceholder limitPlaceholder
* @return A new SQL statement with the LIMIT clause applied.
*/
private String getLimitString(String querySqlString, int offset, int limit, String limitPlaceholder) {
StringBuilder pagingBuilder = new StringBuilder();
String orderby = getOrderByPart(querySqlString);
String distinctStr = "";
String loweredString = querySqlString.toLowerCase();
String sqlPartString = querySqlString;
if (loweredString.trim().startsWith("select")) {
int index = 6;
if (loweredString.startsWith("select distinct")) {
distinctStr = "DISTINCT ";
index = 15;
}
sqlPartString = sqlPartString.substring(index);
}
pagingBuilder.append(sqlPartString);
// if no ORDER BY is specified use fake ORDER BY field to avoid errors
if (StringUtils.isEmpty(orderby)) {
orderby = "ORDER BY CURRENT_TIMESTAMP";
}
StringBuilder result = new StringBuilder();
result.append("WITH query AS (SELECT ")
.append(distinctStr)
.append("TOP 100 PERCENT ")
.append(" ROW_NUMBER() OVER (")
.append(orderby)
.append(") as __row_number__, ")
.append(pagingBuilder)
.append(") SELECT * FROM query WHERE __row_number__ BETWEEN ")
.append(offset).append(" AND ").append(offset + limit)
.append(" ORDER BY __row_number__");
return result.toString();
}
static String getOrderByPart(String sql) {
String loweredString = sql.toLowerCase();
int orderByIndex = loweredString.indexOf("order by");
if (orderByIndex != -1) {
// if we find a new "order by" then we need to ignore
// the previous one since it was probably used for a subquery
return sql.substring(orderByIndex);
} else {
return "";
}
}
}

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src/main/java/com/nis/persistence/dialect/SQLServerDialect.java Normal file
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/**
* Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.nis.persistence.dialect;
/**
* MSSQLServer 数据库实现分页方言
*
* @author poplar.yfyang
* @version 1.0 2010-10-10 下午12:31
* @since JDK 1.5
*/
public class SQLServerDialect implements Dialect {
public boolean supportsLimit() {
return true;
}
static int getAfterSelectInsertPoint(String sql) {
int selectIndex = sql.toLowerCase().indexOf("select");
final int selectDistinctIndex = sql.toLowerCase().indexOf("select distinct");
return selectIndex + (selectDistinctIndex == selectIndex ? 15 : 6);
}
public String getLimitString(String sql, int offset, int limit) {
return getLimit(sql, offset, limit);
}
/**
* 将sql变成分页sql语句,提供将offset及limit使用占位符号(placeholder)替换.
* <pre>
* 如mysql
* dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
* select * from user limit :offset,:limit
* </pre>
*
* @param sql 实际SQL语句
* @param offset 分页开始纪录条数
* @param limit 分页每页显示纪录条数
* @return 包含占位符的分页sql
*/
public String getLimit(String sql, int offset, int limit) {
if (offset > 0) {
throw new UnsupportedOperationException("sql server has no offset");
}
return new StringBuffer(sql.length() + 8)
.append(sql)
.insert(getAfterSelectInsertPoint(sql), " top " + limit)
.toString();
}
}

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src/main/java/com/nis/persistence/dialect/SybaseDialect.java Normal file
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/**
* Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*/
package com.nis.persistence.dialect;
/**
* Sybase数据库分页方言实现。
* 还未实现
*
* @author poplar.yfyang
* @version 1.0 2010-10-10 下午12:31
* @since JDK 1.5
*/
public class SybaseDialect implements Dialect {
public boolean supportsLimit() {
return false;
}
@Override
public String getLimitString(String sql, int offset, int limit) {
return null;
}
/**
* 将sql变成分页sql语句,提供将offset及limit使用占位符号(placeholder)替换.
* <pre>
* 如mysql
* dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
* select * from user limit :offset,:limit
* </pre>
*
* @param sql 实际SQL语句
* @param offset 分页开始纪录条数
* @param offsetPlaceholder 分页开始纪录条数－占位符号
* @param limit 分页每页显示纪录条数
* @param limitPlaceholder 分页纪录条数占位符号
* @return 包含占位符的分页sql
*/
public String getLimitString(String sql, int offset, String offsetPlaceholder, int limit, String limitPlaceholder) {
throw new UnsupportedOperationException("paged queries not supported");
}
}