private int getCount(
Connection connection,
BoundSql boundSql,
Configuration configuration,
MappedStatement mappedStatement)
throws SQLException {
String countSql = "select count(0) from ( " + boundSql.getSql() + " )"; // 记录统计
PreparedStatement countStmt = connection.prepareStatement(countSql);
BoundSql countBS =
new BoundSql(
configuration,
countSql,
boundSql.getParameterMappings(),
boundSql.getParameterObject());
setParameters(countStmt, mappedStatement, countBS, boundSql.getParameterObject());
ResultSet rs = countStmt.executeQuery();
int count = 0;
if (rs.next()) {
count = rs.getInt(1);
}
rs.close();
countStmt.close();
return count;
}
@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();
}
private void pagination(Invocation invocation, StatementHandler target) throws SQLException {
final MetaObject metaStatementHandler = getMetaObject(target);
final BoundSql boundSql = target.getBoundSql();
Page<?> page = PAGE_THREAD_LOCAL.get();
if (page == null) {
page = findPageParameter(boundSql.getParameterObject());
}
// 如果传入的参数中有分页对象且sql语句中有select，才做分页处理
String sql = boundSql.getSql().toLowerCase();
if (sql.startsWith("select") && page != null) {
// 采用物理分页后，就不需要mybatis的内存分页了，所以重置下面的两个参数
metaStatementHandler.setValue("delegate.rowBounds.offset", RowBounds.NO_ROW_OFFSET);
metaStatementHandler.setValue("delegate.rowBounds.limit", RowBounds.NO_ROW_LIMIT);
// 设置分页对象里的总记录数和总页数
Connection connection = (Connection) invocation.getArgs()[0];
MappedStatement mappedStatement =
(MappedStatement) metaStatementHandler.getValue("delegate.mappedStatement");
if (page.isCountTotal()) {
int recordsTotal = getTotalCount(sql, connection, mappedStatement, boundSql);
page.setTotalNum(recordsTotal);
}
// 最后重写sql
String pageSql = buildPageSql(sql, page);
metaStatementHandler.setValue("delegate.boundSql.sql", pageSql);
}
}
public Object intercept(Invocation ivk) throws Throwable {
// TODO Auto-generated method stub
if (ivk.getTarget() instanceof RoutingStatementHandler) {
RoutingStatementHandler statementHandler = (RoutingStatementHandler) ivk.getTarget();
BaseStatementHandler delegate =
(BaseStatementHandler) ReflectHelper.getValueByFieldName(statementHandler, "delegate");
MappedStatement mappedStatement =
(MappedStatement) ReflectHelper.getValueByFieldName(delegate, "mappedStatement");
if (mappedStatement.getId().matches(pageSqlId)) { // 拦截需要分页的SQL
BoundSql boundSql = delegate.getBoundSql();
Object parameterObject =
boundSql
.getParameterObject(); // 分页SQL<select>中parameterType属性对应的实体参数，即Mapper接口中执行分页方法的参数,该参数不得为空
if (parameterObject == null) {
throw new NullPointerException("parameterObject尚未实例化！");
} else {
Connection connection = (Connection) ivk.getArgs()[0];
String sql = boundSql.getSql();
String countSql = "select count(0) from (" + sql + ") as tmp_count"; // 记录统计
PreparedStatement countStmt = connection.prepareStatement(countSql);
BoundSql countBS =
new BoundSql(
mappedStatement.getConfiguration(),
countSql,
boundSql.getParameterMappings(),
parameterObject);
setParameters(countStmt, mappedStatement, countBS, parameterObject);
ResultSet rs = countStmt.executeQuery();
int count = 0;
if (rs.next()) {
count = rs.getInt(1);
}
rs.close();
countStmt.close();
// System.out.println(count);
Page page = null;
if (parameterObject instanceof Page) { // 参数就是Page实体
page = (Page) parameterObject;
page.setEntityOrField(true); // 见com.ttsoft.entity.Page.entityOrField 注释
page.setTotalResult(count);
} else { // 参数为某个实体，该实体拥有Page属性
Field pageField = ReflectHelper.getFieldByFieldName(parameterObject, "page");
if (pageField != null) {
page = (Page) ReflectHelper.getValueByFieldName(parameterObject, "page");
if (page == null) page = new Page();
page.setEntityOrField(false); // 见com.ttsoft.entity.Page.entityOrField 注释
page.setTotalResult(count);
ReflectHelper.setValueByFieldName(parameterObject, "page", page); // 通过反射，对实体对象设置分页对象
} else {
throw new NoSuchFieldException(parameterObject.getClass().getName() + "不存在 page 属性！");
}
}
String pageSql = generatePageSql(sql, page);
ReflectHelper.setValueByFieldName(boundSql, "sql", pageSql); // 将分页sql语句反射回BoundSql.
}
}
}
return ivk.proceed();
}
/**
* 获取总页数
*
* @param conn
* @param orgBoundSql
* @param configuration
* @param mappedStatement
* @return
* @throws SQLException
*/
private int totalCount(
Connection conn,
BoundSql orgBoundSql,
Configuration configuration,
MappedStatement mappedStatement)
throws SQLException {
String orgSql = orgBoundSql.getSql();
StringBuffer sqlBuffer = new StringBuffer(orgSql.length() + 100);
sqlBuffer.append(" SELECT COUNT(0) FROM (").append(orgSql).append(") TEMP ");
logger.debug(" this is countsql : {}", sqlBuffer.toString());
PreparedStatement preparedStatement = conn.prepareStatement(sqlBuffer.toString());
Object parameterObject = orgBoundSql.getParameterObject();
BoundSql boundSql =
new BoundSql(
configuration,
sqlBuffer.toString(),
orgBoundSql.getParameterMappings(),
parameterObject);
setParameters(preparedStatement, mappedStatement, boundSql, parameterObject);
ResultSet rs = preparedStatement.executeQuery();
if (rs != null) {
if (rs.next()) {
return rs.getInt(1);
}
}
return 0;
}
@Override
public Object intercept(Invocation invocation) throws Throwable {
// 当前环境 MappedStatement，BoundSql，及sql取得
MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
Object parameter = invocation.getArgs()[1];
BoundSql boundSql = mappedStatement.getBoundSql(parameter);
String originalSql = boundSql.getSql().trim();
Object parameterObject = boundSql.getParameterObject();
// Page对象获取，“信使”到达拦截器！
Page page = searchPageWithXpath(boundSql.getParameterObject(), SystemConstant.PAGE);
// 如果分页参数存在，进行分页处理。
if (page != null) {
String countSql = getCountSql(originalSql);
Connection connection =
mappedStatement.getConfiguration().getEnvironment().getDataSource().getConnection();
PreparedStatement countStmt = connection.prepareStatement(countSql);
BoundSql countBS = copyFromBoundSql(mappedStatement, boundSql, countSql);
DefaultParameterHandler parameterHandler =
new DefaultParameterHandler(mappedStatement, parameterObject, countBS);
parameterHandler.setParameters(countStmt);
ResultSet rs = countStmt.executeQuery();
int totpage = 0;
if (rs.next()) {
totpage = rs.getInt(1);
}
rs.close();
countStmt.close();
connection.close();
// 分页计算
page.setTotalRecord(totpage);
// 对原始Sql追加limit
int offset = (page.getPageNo() - 1) * page.getPageSize();
StringBuffer sb = new StringBuffer();
sb.append(originalSql)
.append(" limit ")
.append(offset)
.append(",")
.append(page.getPageSize());
BoundSql newBoundSql = copyFromBoundSql(mappedStatement, boundSql, sb.toString());
MappedStatement newMs =
copyFromMappedStatement(mappedStatement, new BoundSqlSqlSource(newBoundSql));
invocation.getArgs()[0] = newMs;
}
return invocation.proceed();
}
/**
* 对SQL参数(?)设值
*
* @param ps
* @param mappedStatement
* @param boundSql
* @param parameterObject
* @throws SQLException
*/
private void setParameters(
PreparedStatement ps, MappedStatement mappedStatement, BoundSql boundSql)
throws SQLException {
ParameterHandler parameterHandler =
mappedStatement
.getConfiguration()
.newParameterHandler(mappedStatement, boundSql.getParameterObject(), boundSql);
parameterHandler.setParameters(ps);
}
/**
* 获取总记录数
*
* @param sql 原始sql语句
* @param conn
* @param ms
* @param boundSql
* @return
* @throws SQLException
*/
private int getTotalCount(String sql, Connection conn, MappedStatement ms, BoundSql boundSql)
throws SQLException {
int start = sql.indexOf("from");
if (start == -1) {
throw new RuntimeException("statement has no 'from' keyword");
}
int stop = sql.indexOf("order by");
if (stop == -1) {
stop = sql.length();
}
String countSql = "select count(0) " + sql.substring(start, stop);
BoundSql countBoundSql =
new BoundSql(
ms.getConfiguration(),
countSql,
boundSql.getParameterMappings(),
boundSql.getParameterObject());
ParameterHandler parameterHandler =
new DefaultParameterHandler(ms, boundSql.getParameterObject(), countBoundSql);
PreparedStatement stmt = null;
ResultSet rs = null;
int count = 0;
try {
stmt = conn.prepareStatement(countSql);
// 通过parameterHandler给PreparedStatement对象设置参数
parameterHandler.setParameters(stmt);
rs = stmt.executeQuery();
if (rs.next()) {
count = rs.getInt(1);
}
} finally {
CloseableUtil.closeQuietly(rs);
CloseableUtil.closeQuietly(stmt);
}
return count;
}
/** 复制BoundSql对象 */
private BoundSql copyFromBoundSql(MappedStatement ms, BoundSql boundSql, String sql) {
BoundSql newBoundSql =
new BoundSql(
ms.getConfiguration(),
sql,
boundSql.getParameterMappings(),
boundSql.getParameterObject());
for (ParameterMapping mapping : boundSql.getParameterMappings()) {
String prop = mapping.getProperty();
if (boundSql.hasAdditionalParameter(prop)) {
newBoundSql.setAdditionalParameter(prop, boundSql.getAdditionalParameter(prop));
}
}
return newBoundSql;
}
@Override
public Object intercept(Invocation invocation) throws Throwable {
StatementHandler statementHandler = (StatementHandler) invocation.getTarget();
MetaObject metaStatementHandler =
MetaObject.forObject(
statementHandler,
DEFAULT_OBJECT_FACTORY,
DEFAULT_OBJECT_WRAPPER_FACTORY,
DEFAULT_REFLECTOR_FACTORY);
// 分离代理对象链(由于目标类可能被多个拦截器拦截，从而形成多次代理，通过下面的两次循环
// 可以分离出最原始的的目标类)
while (metaStatementHandler.hasGetter("h")) {
Object object = metaStatementHandler.getValue("h");
metaStatementHandler =
MetaObject.forObject(
object,
DEFAULT_OBJECT_FACTORY,
DEFAULT_OBJECT_WRAPPER_FACTORY,
DEFAULT_REFLECTOR_FACTORY);
}
// 分离最后一个代理对象的目标类
while (metaStatementHandler.hasGetter("target")) {
Object object = metaStatementHandler.getValue("target");
metaStatementHandler =
MetaObject.forObject(
object,
DEFAULT_OBJECT_FACTORY,
DEFAULT_OBJECT_WRAPPER_FACTORY,
DEFAULT_REFLECTOR_FACTORY);
}
if (null == dialect || "".equals(dialect)) {
logger.warn("Property dialect is not setted,use default 'mysql' ");
dialect = defaultDialect;
}
if (null == pageSqlId || "".equals(pageSqlId)) {
logger.warn("Property pageSqlId is not setted,use default '.*Page$' ");
pageSqlId = defaultPageSqlId;
}
MappedStatement mappedStatement =
(MappedStatement) metaStatementHandler.getValue("delegate.mappedStatement");
PageParameter page = null;
Object type = metaStatementHandler.getValue("delegate.boundSql.parameterObject");
if (PageParameter.class.isInstance(type)) {
page = (PageParameter) type;
}
// 只重写需要分页的sql语句。通过MappedStatement的ID匹配，默认重写以Page结尾的
// MappedStatement的sql
if (mappedStatement.getId().matches(pageSqlId) && page != null && page.getLimit() > 0) {
BoundSql boundSql = (BoundSql) metaStatementHandler.getValue("delegate.boundSql");
Object parameterObject = boundSql.getParameterObject();
if (parameterObject == null) {
throw new NullPointerException("parameterObject is null!");
} else {
// 分页参数作为参数对象parameterObject的一个属性
String sql = boundSql.getSql();
// 重写sql
String pageSql = buildPageSql(sql, page, dialect);
metaStatementHandler.setValue("delegate.boundSql.sql", pageSql);
// 采用物理分页后，就不需要mybatis的内存分页了，所以重置下面的两个参数
metaStatementHandler.setValue("delegate.rowBounds.offset", RowBounds.NO_ROW_OFFSET);
metaStatementHandler.setValue("delegate.rowBounds.limit", RowBounds.NO_ROW_LIMIT);
Connection connection = (Connection) invocation.getArgs()[0];
// 重设分页参数里的总页数等
setPageParameter(sql, connection, mappedStatement, boundSql, page);
}
}
// 将执行权交给下一个拦截器
return invocation.proceed();
}
public Object intercept(Invocation ivk) throws Throwable {
if (ivk.getTarget() instanceof RoutingStatementHandler) {
RoutingStatementHandler statementHandler = (RoutingStatementHandler) ivk.getTarget();
BaseStatementHandler delegate =
(BaseStatementHandler) ReflectHelper.getValueByFieldName(statementHandler, "delegate");
MappedStatement mappedStatement =
(MappedStatement) ReflectHelper.getValueByFieldName(delegate, "mappedStatement");
if (mappedStatement.getId().matches(pageSqlId)) { // 拦截需要分页的SQL
BoundSql boundSql = delegate.getBoundSql();
Object parameterObject =
boundSql
.getParameterObject(); // 分页SQL<select>中parameterType属性对应的实体参数，即Mapper接口中执行分页方法的参数,该参数不得为空
if (parameterObject == null) {
throw new NullPointerException("parameterObject尚未实例化！");
} else {
long count = 0;
String sql = "";
try {
Connection connection = (Connection) ivk.getArgs()[0];
sql = boundSql.getSql();
String countSql = "";
if ("mysql".equals(dialect)) {
countSql = "select count(1) from (" + sql + ") as tmp_count"; // 记录统计
} else if ("oracle".equals(dialect)) {
countSql = "select count(1) from (" + sql + ") tmp_count"; // 记录统计
}
PreparedStatement countStmt = connection.prepareStatement(countSql);
BoundSql countBS =
new BoundSql(
mappedStatement.getConfiguration(),
countSql,
boundSql.getParameterMappings(),
parameterObject);
setParameters(countStmt, mappedStatement, countBS, parameterObject);
ResultSet rs = countStmt.executeQuery();
if (rs.next()) {
count = rs.getLong(1);
}
rs.close();
countStmt.close();
} catch (Exception e) {
throw new RuntimeException("分页查询无法获取总记录数", e);
}
Pagination page = null;
if (parameterObject instanceof Pagination) { // 参数就是Pagination实体
page = (Pagination) parameterObject;
page.setTotalRows(count);
} else { // 参数为某个实体，该实体拥有Page属性
Field pageField = ReflectHelper.getFieldByFieldName(parameterObject, "pagination");
if (pageField != null) {
page = (Pagination) ReflectHelper.getValueByFieldName(parameterObject, "pagination");
if (page == null) page = new Pagination();
page.setTotalRows(count);
ReflectHelper.setValueByFieldName(
parameterObject, "pagination", page); // 通过反射，对实体对象设置分页对象
} else {
throw new NoSuchFieldException(
parameterObject.getClass().getName() + "不存在 pagination 属性！");
}
}
String pageSql = generatePageSql(sql, page);
ReflectHelper.setValueByFieldName(boundSql, "sql", pageSql); // 将分页sql语句反射回BoundSql.
}
}
}
return ivk.proceed();
}
@Override
@SuppressWarnings({"unchecked", "rawtypes"})
public Object intercept(Invocation invocation) throws Throwable {
if (invocation.getTarget() instanceof StatementHandler) { // 控制SQL和查询总数的地方
Page page = pageThreadLocal.get();
Order order = orderThreadLocal.get();
RoutingStatementHandler handler = (RoutingStatementHandler) invocation.getTarget();
StatementHandler delegate = (StatementHandler) ReflectUtil.getFieldValue(handler, "delegate");
BoundSql boundSql = delegate.getBoundSql();
if (page == null) { // 不是分页查询
if (order != null) {
String orderSql = buildOrderSql(order, boundSql.getSql());
ReflectUtil.setFieldValue(boundSql, "sql", orderSql);
}
return invocation.proceed();
}
Connection connection = (Connection) invocation.getArgs()[0];
prepareAndCheckDatabaseType(connection); // 准备数据库类型
if (page.getTotalPage() > -1) {
if (log.isTraceEnabled()) {
log.trace("已经设置了总页数, 不需要再查询总数.");
}
} else {
Object parameterObj = boundSql.getParameterObject();
MappedStatement mappedStatement =
(MappedStatement) ReflectUtil.getFieldValue(delegate, "mappedStatement");
queryTotalRecord(page, parameterObj, mappedStatement, connection);
}
String sql = boundSql.getSql();
if (order != null) {
sql = buildOrderSql(order, sql);
}
String pageSql = buildPageSql(page, sql);
if (log.isDebugEnabled()) {
log.debug("分页时, 生成分页pageSql: " + pageSql);
}
ReflectUtil.setFieldValue(boundSql, "sql", pageSql);
return invocation.proceed();
} else { // 查询结果的地方
try {
// 获取是否有分页Page对象
Page<?> page = findPageObject(invocation.getArgs()[1]);
// 获取是否有排序Order对象
Order order = findOrderObject(invocation.getArgs()[1]);
if (order != null) {
orderThreadLocal.set(order);
}
if (page == null) {
if (log.isTraceEnabled()) {
log.trace("没有Page对象作为参数, 不是分页查询.");
}
return invocation.proceed();
} else {
if (log.isTraceEnabled()) {
log.trace("检测到分页Page对象, 使用分页查询.");
}
}
// 设置真正的parameterObj
invocation.getArgs()[1] = extractRealParameterObject(invocation.getArgs()[1]);
pageThreadLocal.set(page);
Object resultObj = invocation.proceed(); // Executor.query(..)
if (resultObj instanceof List) {
/* @SuppressWarnings({ "unchecked", "rawtypes" }) */
page.setDatas((List) resultObj);
}
return resultObj;
} finally {
pageThreadLocal.remove();
orderThreadLocal.remove();
}
}
}
public Object intercept(Invocation invocation) throws Throwable {
RoutingStatementHandler statementHandler = (RoutingStatementHandler) invocation.getTarget();
BoundSql boundSql = statementHandler.getBoundSql();
MetaObject metaStatementHandler = SystemMetaObject.forObject(statementHandler);
BaseStatementHandler delegate =
(BaseStatementHandler) ReflectHelper.getValueByFieldName(statementHandler, "delegate");
MappedStatement mappedStatement =
(MappedStatement) ReflectHelper.getValueByFieldName(delegate, "mappedStatement");
Connection connection = (Connection) invocation.getArgs()[0];
// 获取当前准备执行的行边界
RowBounds rowBounds = (RowBounds) metaStatementHandler.getValue("delegate.rowBounds");
// 判断是否设置分页
if (rowBounds == null || rowBounds == RowBounds.DEFAULT) {
return invocation.proceed();
}
Configuration configuration =
(Configuration) metaStatementHandler.getValue("delegate.configuration");
Dialect.Type databaseType = null;
// 获取当前的数据库方言
try {
databaseType =
Dialect.Type.valueOf(configuration.getVariables().getProperty("dialect").toUpperCase());
} catch (Exception e) {
// ignore
throw e;
}
if (databaseType == null) {
throw new RuntimeException(
"the value of the dialect property in configuration.xml is not defined : "
+ configuration.getVariables().getProperty("dialect"));
}
Dialect dialect = null;
// 判断数据库方言
switch (databaseType) {
case ORACLE:
dialect = new OracleDialect();
}
// 原始sql
String originalSql = (String) metaStatementHandler.getValue("delegate.boundSql.sql");
// 统计总数
int count = getCount(connection, boundSql, configuration, mappedStatement);
Object obj = boundSql.getParameterObject();
if (null != obj && obj instanceof Map) {
Map parameterObject = (Map) boundSql.getParameterObject();
parameterObject.put("_dataCount", count);
} else {
throw new NullPointerException("service中getGridData的condition参数不能为空！");
}
// 设置拼接好的分页sql
metaStatementHandler.setValue(
"delegate.boundSql.sql",
dialect.getPageSql(originalSql, rowBounds.getOffset(), rowBounds.getLimit()));
// 重置行边界
metaStatementHandler.setValue("delegate.rowBounds.offset", RowBounds.NO_ROW_OFFSET);
metaStatementHandler.setValue("delegate.rowBounds.limit", RowBounds.NO_ROW_LIMIT);
if (log.isDebugEnabled()) {
log.debug("生成分页SQL : " + boundSql.getSql());
}
return invocation.proceed();
}
public Object intercept(Invocation ivk) throws Throwable {
if (ivk.getTarget() instanceof RoutingStatementHandler) {
RoutingStatementHandler statementHandler = (RoutingStatementHandler) ivk.getTarget();
BaseStatementHandler delegate =
(BaseStatementHandler) Reflections.getFieldValue(statementHandler, "delegate");
MappedStatement mappedStatement =
(MappedStatement) Reflections.getFieldValue(delegate, "mappedStatement");
if (mappedStatement.getId().matches(pageSqlId)) { // 拦截需要分页的SQL
BoundSql boundSql = delegate.getBoundSql();
Object parameterObject =
boundSql
.getParameterObject(); // 分页SQL<select>中parameterType属性对应的实体参数，即Mapper接口中执行分页方法的参数,该参数不得为空
if (parameterObject == null) {
throw new NullPointerException("parameterObject尚未实例化！");
} else {
// 生成查询总数语句,并获取总数
Connection connection = (Connection) ivk.getArgs()[0];
String sql = boundSql.getSql();
StringBuilder countSql = new StringBuilder();
countSql.append("select count(1) from (").append(sql).append(") tmp_count");
PreparedStatement countStmt = connection.prepareStatement(countSql.toString());
// BoundSql countBS = new
// BoundSql(mappedStatement.getConfiguration(),countSql.toString(),boundSql.getParameterMappings(),parameterObject);
// 使用DefaultParameterHandler来对语句进行预处理
DefaultParameterHandler defaultParameterHandler =
new DefaultParameterHandler(mappedStatement, parameterObject, boundSql);
defaultParameterHandler.setParameters(countStmt);
ResultSet rs = countStmt.executeQuery();
long count = 0;
if (rs.next()) {
count = rs.getLong(1);
}
rs.close();
countStmt.close();
// System.out.println(count);
RequestBean requestBean = null;
if (parameterObject instanceof RequestBean) { // 参数就是Page实体
requestBean = (RequestBean) parameterObject;
requestBean.setCount(count);
} else if (parameterObject instanceof Map) {
requestBean = (RequestBean) ((Map) parameterObject).get("requestBean");
requestBean.setCount(count);
} else { // 参数为某个实体，该实体拥有Page属性
Field pageField = Reflections.getAccessibleField(parameterObject, "requestBean");
if (pageField != null) {
requestBean = (RequestBean) Reflections.getFieldValue(parameterObject, "requestBean");
if (requestBean == null) requestBean = new RequestBean();
requestBean.setCount(count);
Reflections.setFieldValue(
parameterObject, "requestBean", requestBean); // 通过反射，对实体对象设置分页对象
} else {
throw new NoSuchFieldException(
parameterObject.getClass().getName() + "不存在 requestBean 属性！");
}
}
String pageSql =
dialectObj.getLimitString(sql, requestBean.getOffset(), requestBean.getPageSize());
Reflections.setFieldValue(boundSql, "sql", pageSql); // 将分页sql语句反射回BoundSql.
if (logger.isDebugEnabled()) {
logger.debug("生成分页SQL : " + boundSql.getSql());
}
}
}
}
return ivk.proceed();
}