59463111670adc424287ab533fab88cc322fee25.svn-base
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/**
* Copyright © 2015-2018 ODM All rights reserved.
*/
package com.thinkgem.jeesite.common.persistence.interceptor;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlSource;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import com.thinkgem.jeesite.common.persistence.Page;
import com.thinkgem.jeesite.common.utils.Reflections;
import com.thinkgem.jeesite.common.utils.StringUtils;
import java.util.Properties;
/**
* 数据库分页插件，只拦截查询语句.
* @author poplar.yfyang / thinkgem
* @version 2013-8-28
*/
@Intercepts({@Signature(type = Executor.class, method = "query",
args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class})})
public class PaginationInterceptor extends BaseInterceptor {
private static final long serialVersionUID = 1L;
@Override
public Object intercept(Invocation invocation) throws Throwable {
final MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
// //拦截需要分页的SQL
//// if (mappedStatement.getId().matches(_SQL_PATTERN)) {
// if (StringUtils.indexOfIgnoreCase(mappedStatement.getId(), _SQL_PATTERN) != -1) {
Object parameter = invocation.getArgs()[1];
BoundSql boundSql = mappedStatement.getBoundSql(parameter);
Object parameterObject = boundSql.getParameterObject();
//获取分页参数对象
Page<Object> page = null;
if (parameterObject != null) {
page = convertParameter(parameterObject, page);
}
//如果设置了分页对象，则进行分页
if (page != null && page.getPageSize() != -1) {
if (StringUtils.isBlank(boundSql.getSql())){
return null;
}
String originalSql = boundSql.getSql().trim();
//得到总记录数
page.setCount(SQLHelper.getCount(originalSql, null, mappedStatement, parameterObject, boundSql, log));
//分页查询 本地化对象 修改数据库注意修改实现
String pageSql = SQLHelper.generatePageSql(originalSql, page, DIALECT);
// if (log.isDebugEnabled()) {
// log.debug("PAGE SQL:" + StringUtils.replace(pageSql, "\n", ""));
// }
invocation.getArgs()[2] = new RowBounds(RowBounds.NO_ROW_OFFSET, RowBounds.NO_ROW_LIMIT);
BoundSql newBoundSql = new BoundSql(mappedStatement.getConfiguration(), pageSql, boundSql.getParameterMappings(), boundSql.getParameterObject());
//解决MyBatis 分页foreach 参数失效 start
if (Reflections.getFieldValue(boundSql, "metaParameters") != null) {
MetaObject mo = (MetaObject) Reflections.getFieldValue(boundSql, "metaParameters");
Reflections.setFieldValue(newBoundSql, "metaParameters", mo);
}
//解决MyBatis 分页foreach 参数失效 end
MappedStatement newMs = copyFromMappedStatement(mappedStatement, new BoundSqlSqlSource(newBoundSql));
invocation.getArgs()[0] = newMs;
}
// }
return invocation.proceed();
}
@Override
public Object plugin(Object target) {
return Plugin.wrap(target, this);
}
@Override
public void setProperties(Properties properties) {
super.initProperties(properties);
}
private MappedStatement copyFromMappedStatement(MappedStatement ms,
SqlSource newSqlSource) {
MappedStatement.Builder builder = new MappedStatement.Builder(ms.getConfiguration(),
ms.getId(), newSqlSource, ms.getSqlCommandType());
builder.resource(ms.getResource());
builder.fetchSize(ms.getFetchSize());
builder.statementType(ms.getStatementType());
builder.keyGenerator(ms.getKeyGenerator());
if (ms.getKeyProperties() != null) {
for (String keyProperty : ms.getKeyProperties()) {
builder.keyProperty(keyProperty);
}
}
builder.timeout(ms.getTimeout());
builder.parameterMap(ms.getParameterMap());
builder.resultMaps(ms.getResultMaps());
builder.cache(ms.getCache());
return builder.build();
}
public static class BoundSqlSqlSource implements SqlSource {
BoundSql boundSql;
public BoundSqlSqlSource(BoundSql boundSql) {
this.boundSql = boundSql;
}
public BoundSql getBoundSql(Object parameterObject) {
return boundSql;
}
}
}