本篇内容主要讲解“怎么用MyBatis进行数据权限验证”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“怎么用MyBatis进行数据权限验证”吧!
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首先先创建表
CREATE TABLE `dataprivilegeconfig` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`project` varchar(32) DEFAULT NULL comment '项目名称',
`module` varchar(32) NOT NULL comment '模块名称',
`tableName` varchar(32) NOT NULL comment '表名',
`statement` varchar(512) NOT NULL comment '配置的SQL片段',
PRIMARY KEY (`id`)
) ;
使用一个自定义annotation来实现不同模块，拼接不同的SQL文本
package com.bj58.mis.datapriv.plugin.mybatis;
import java.lang.annotation.*;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
@Documented
@Inherited
@Retention(RUNTIME)
@Target({ TYPE, METHOD })
public @interface DataPrivilege{
String module() default "all";
}上文的SQL解析代码
SQLDataPrivilege类
package com.bj58.mis.datapriv.core;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
import com.alibaba.druid.sql.ast.expr.SQLQueryExpr;
import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
import com.alibaba.druid.sql.ast.statement.SQLJoinTableSource;
import com.alibaba.druid.sql.ast.statement.SQLSelect;
import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
import com.alibaba.druid.sql.ast.statement.SQLSelectQuery;
import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
import com.alibaba.druid.sql.ast.statement.SQLSubqueryTableSource;
import com.alibaba.druid.sql.ast.statement.SQLTableSource;
import com.alibaba.druid.sql.ast.statement.SQLUnionQuery;
import com.alibaba.druid.sql.parser.SQLExprParser;
import com.alibaba.druid.sql.parser.SQLParserUtils;
import com.alibaba.druid.sql.parser.SQLStatementParser;
import com.alibaba.druid.util.JdbcUtils;
/**
* Hello world!
*
*/
public class SQLDataPrivilege {
public static void main(String[] args) {
}
//单例.该对象用于给已经存在的SQL增加数据权限
private static SQLDataPrivilege INSTANCE = new SQLDataPrivilege();
public static SQLDataPrivilege getInstance() {
return INSTANCE;
}
//从数据库中获取配置信息
private SQLDataPrivilege() {
try {
Class.forName("com.MySQL.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test", "root", "laohuali@58");
String sql="select project,module,tableName,group_concat(statement separator ' and ') statement ";
sql=sql+" from DataPrivilegeConfig where Project='测试' ";
sql=sql+" group by project,module,tableName";
PreparedStatement ps = con.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
while (rs.next()) {
Privilege p = new Privilege();
p.setProject(rs.getString("project"));
p.setModule(rs.getString("module"));
p.setTableName(rs.getString("tableName"));
p.setStatement(rs.getString("statement"));
privList.add(p);
}
rs.close();
ps.close();
con.close();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}
//保存本项目的数据权限配置信息
private List privList = new ArrayList();
//在SQL上拼接数据权限
public String addPrivilege(final String module,final String sql, Map varMap) {
// SQLParserUtils.createSQLStatementParser可以将sql装载到Parser里面
SQLStatementParser parser = SQLParserUtils.createSQLStatementParser(sql, JdbcUtils.MYSQL);
// parseStatementList的返回值SQLStatement本身就是druid里面的语法树对象
List stmtList = parser.parseStatementList();
SQLStatement stmt = stmtList.get(0);
//如果不是查询,则返回
if (!(stmt instanceof SQLSelectStatement)) {
return sql;
}
SQLSelectStatement selectStmt = (SQLSelectStatement) stmt;
// 拿到SQLSelect 通过在这里打断点看对象我们可以看出这是一个树的结构
SQLSelect sqlselect = selectStmt.getSelect();
SQLSelectQueryBlock query = (SQLSelectQueryBlock) sqlselect.getQuery();
parseSubQuery(module,query.getSelectList(), varMap);
parseTable(module,query, varMap);
System.out.println(sqlselect.toString());
return sqlselect.toString();
}
//给子查询增加数据权限
private void parseSubQuery(final String module,final List fieldList, final Map varMap) {
for (SQLSelectItem item : fieldList) {
if (item.getExpr() instanceof SQLQueryExpr) {
SQLQueryExpr expr = (SQLQueryExpr) item.getExpr();
parseTable(module,expr.getSubQuery().getQueryBlock(), varMap);
}
}
}
//递归处理嵌套表
private void parseTable(final String module,final SQLSelectQueryBlock query, final Map varMap) {
if (query == null) {
return;
}
SQLTableSource tableSource = query.getFrom();
if (tableSource instanceof SQLExprTableSource) {
//如果是普通的表,则在where中增加数据权限
SQLExprTableSource table = ((SQLExprTableSource) tableSource);
String tableName = table.getName().getSimpleName();
String aliasName = table.getAlias();
SQLExpr sqlExpr = createSQLExpr(module,tableName, aliasName, varMap);
createWhereSQLExpr(query, varMap, sqlExpr);
} else if (tableSource instanceof SQLSubqueryTableSource) {
//如果是嵌套表,则递归到内层
SQLSubqueryTableSource table = ((SQLSubqueryTableSource) tableSource);
parseTable(module,table.getSelect().getQueryBlock(), varMap);
} else if (tableSource instanceof SQLJoinTableSource) {
//如果是两个表关联.则在on条件中增加数据权限。并且在左右表中分别判断是否是union all的情况
SQLJoinTableSource table = ((SQLJoinTableSource) tableSource);
SQLTableSource left = table.getLeft();
SQLTableSource right = table.getRight();
SQLExpr onExpr = table.getCondition();
if (left instanceof SQLSubqueryTableSource) {
SQLSubqueryTableSource leftTable = ((SQLSubqueryTableSource) left);
parseUnion(module,leftTable.getSelect().getQuery(), varMap);
parseTable(module,leftTable.getSelect().getQueryBlock(), varMap);
} else if (left instanceof SQLExprTableSource) {
SQLExprTableSource joinTable = ((SQLExprTableSource) left);
onExpr = createOnExpr(module,joinTable, onExpr, varMap);
}
if (right instanceof SQLSubqueryTableSource) {
SQLSubqueryTableSource rightTable = ((SQLSubqueryTableSource) right);
parseUnion(module,rightTable.getSelect().getQuery(), varMap);
parseTable(module,rightTable.getSelect().getQueryBlock(), varMap);
} else if (right instanceof SQLExprTableSource) {
SQLExprTableSource joinTable = ((SQLExprTableSource) right);
onExpr = createOnExpr(module,joinTable, onExpr, varMap);
}
table.setCondition(onExpr);
}
}
//如果是union all的情况,则通过递归进入内层
private boolean parseUnion(final String module,final SQLSelectQuery query, final Map varMap) {
if (query instanceof SQLUnionQuery) {
SQLUnionQuery unionQuery = (SQLUnionQuery) query;
if (unionQuery.getLeft() instanceof SQLUnionQuery) {
parseUnion(module,unionQuery.getLeft(), varMap);
} else if (unionQuery.getLeft() instanceof SQLSelectQueryBlock) {
SQLSelectQueryBlock queryBlock = (SQLSelectQueryBlock) unionQuery.getLeft();
parseTable(module,queryBlock, varMap);
}
if (unionQuery.getRight() instanceof SQLUnionQuery) {
parseUnion(module,unionQuery.getRight(), varMap);
} else if (unionQuery.getRight() instanceof SQLSelectQueryBlock) {
SQLSelectQueryBlock queryBlock = (SQLSelectQueryBlock) unionQuery.getRight();
parseTable(module,queryBlock, varMap);
}
return true;
}
return false;
}
//在连接的on条件中拼接权限
private SQLExpr createOnExpr(final String module,SQLExprTableSource joinTable, SQLExpr onExpr, final Map varMap) {
String tableName = joinTable.getName().getSimpleName();
String aliasName = joinTable.getAlias();
SQLExpr sqlExpr = createSQLExpr(module,tableName, aliasName, varMap);
if (sqlExpr != null) {
SQLBinaryOpExpr newWhereExpr = new SQLBinaryOpExpr(onExpr, SQLBinaryOperator.BooleanAnd, sqlExpr);
onExpr = newWhereExpr;
}
return onExpr;
}
//根据配置获取拼接好的权限SQL
private SQLExpr createSQLExpr(String module,String tableName, String aliasName, final Map varMap) {
StringBuffer constraintsBuffer = new StringBuffer("");
for (Privilege p : privList) {
if (tableName.equals(p.getTableName()) && module.equals(p.getModule())) {
constraintsBuffer.append(p.toString(aliasName, varMap));
}
}
if ("".equals(constraintsBuffer.toString())) {
return null;
}
SQLExprParser constraintsParser = SQLParserUtils
.createExprParser(constraintsBuffer.toString(), JdbcUtils.MYSQL);
SQLExpr constraintsExpr = constraintsParser.expr();
return constraintsExpr;
}
//拼接where中的权限信息
private void createWhereSQLExpr(final SQLSelectQueryBlock query, final Map varMap,
SQLExpr sqlExpr) {
if (sqlExpr == null) {
return;
}
SQLExpr whereExpr = query.getWhere();
// 修改where表达式
if (whereExpr == null) {
query.setWhere(sqlExpr);
} else {
SQLBinaryOpExpr newWhereExpr = new SQLBinaryOpExpr(whereExpr, SQLBinaryOperator.BooleanAnd, sqlExpr);
query.setWhere(newWhereExpr);
}
}
}Privilege类
package com.bj58.mis.datapriv.core;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Privilege {
private String project = null;
private String module = null;
private String tableName = null;
private String statement = null;
private Map varDef = new HashMap();
private Pattern pattern = Pattern.compile("\\{.*?\\}");
public String getProject() {
return project;
}
public void setProject(String project) {
if (this.project == null) {
this.project = project;
}
}
public String getModule() {
return module;
}
public void setModule(String module) {
if (this.module == null) {
this.module = module;
}
}
public String getTableName() {
return tableName;
}
public void setTableName(String tableName) {
if (this.tableName == null) {
this.tableName = tableName;
}
}
public String getStatement() {
return statement;
}
public void setStatement(String statement) {
if (this.statement == null) {
this.statement = statement;
Matcher m = pattern.matcher(this.statement);
while (m.find()) {
String var = m.group().replaceAll("(\\{|\\})", "").trim();
this.varDef.put(var, "\\{" + var + "\\}");
}
}
}
public String toString(String aliasName, Map varMap) {
if (aliasName == null || "".equals(aliasName)) {
aliasName = tableName;
}
String sqlString = this.statement.replaceAll("#tab#", aliasName);
for (Entry entry: varDef.entrySet()) {
if (varMap.containsKey(entry.getKey())) {
sqlString = sqlString.replaceAll(entry.getValue(), varMap.get(entry.getKey()));
} else {
throw new RuntimeException("缺少必要信息");
}
}
return sqlString;
}
}增加一个MyBatis拦截器实现拼接SQL的功能
package com.bj58.mis.datapriv.plugin.mybatis;
import com.bj58.mis.datapriv.core.SQLDataPrivilege;
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.Signature;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.SystemMetaObject;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Plugin;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
@Intercepts({
@Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class,
RowBounds.class, ResultHandler.class})
})
public class MapperInterceptor implements Interceptor {
private Properties properties;
private Map moduleMapping=new ConcurrentHashMap();
@Override
public Object intercept(Invocation invocation) throws Throwable {
Object[] args = invocation.getArgs();
MappedStatement mappedStatement = (MappedStatement) args[0];
Object parameter = args[1];
final BoundSql boundSql = mappedStatement.getBoundSql(parameter);
MappedStatement newMs = copyFromMappedStatement(mappedStatement, boundSql,parameter);
System.out.println(newMs.getBoundSql(parameter).getSql());
long start = System.currentTimeMillis();
List returnValue = (List) invocation.proceed();
long end = System.currentTimeMillis();
return returnValue;
}
private String concatSQL(String mapperId, String sql, Object parameter) {
String module=moduleMapping.get(mapperId);
if(module==null){
initModule(mapperId);
module=moduleMapping.get(mapperId);
}
if("".equals(module)){
return sql;
}
Map newParameterMap=new HashMap();
for(Map.Entry entry : ((Map)parameter).entrySet()){
if(entry.getValue() instanceof ArrayList){
StringBuilder sb=new StringBuilder(128);
sb.append(" ( ");
for(Object obj:(ArrayList)entry.getValue()) {
if(obj instanceof String) {
sb.append("'");
sb.append(obj);
sb.append("',");
}else {
sb.append(obj);
sb.append(",");
}
}
sb.deleteCharAt(sb.length()-1);
sb.append(" ) ");
newParameterMap.put(entry.getKey(),sb.toString());
}else{
newParameterMap.put(entry.getKey(), String.valueOf( entry.getValue()));
}
}
SQLDataPrivilege s =SQLDataPrivilege.getInstance();
return s.addPrivilege(module,sql,newParameterMap);
}
private void initModule(String mapperId){
String clazzName = mapperId.substring(0, mapperId.lastIndexOf("."));
try {
Class clazz = Class.forName(clazzName);
DataPrivilege clazzDataPrivilege= (DataPrivilege) clazz.getAnnotation(DataPrivilege.class);
for(Method method:clazz.getMethods()){
String key=clazzName+"."+method.getName();
DataPrivilege methodDataPrivilege=method.getAnnotation(DataPrivilege.class);
if(methodDataPrivilege!=null){
moduleMapping.put(key,methodDataPrivilege.module());
}else if(clazzDataPrivilege!=null){
moduleMapping.put(key,clazzDataPrivilege.module());
}else{
moduleMapping.put(key,"");
}
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
public static class BoundSqlSqlSource implements SqlSource {
private BoundSql boundSql;
public BoundSqlSqlSource(BoundSql boundSql) {
this.boundSql = boundSql;
}
public BoundSql getBoundSql(Object parameterObject) {
return boundSql;
}
}
private MappedStatement copyFromMappedStatement(MappedStatement ms, BoundSql boundSql, Object parameter) {
String sql = concatSQL(ms.getId(), boundSql.getSql(),parameter);
BoundSql newBoundSql = new BoundSql(ms.getConfiguration(), sql,boundSql.getParameterMappings(), boundSql.getParameterObject());
MetaObject boundSqlObject = SystemMetaObject.forObject(boundSql);
MetaObject newBoundSqlObject = SystemMetaObject.forObject(newBoundSql);
newBoundSqlObject.setValue("metaParameters",boundSqlObject.getValue("metaParameters"));
try {
Field additionalParametersField=BoundSql.class.getDeclaredField("additionalParameters");
additionalParametersField.setAccessible(true);
Map boundSqlAdditionalParametersField= (Map) additionalParametersField.get(boundSql);
Map newBoundSqlObjectSqlAdditionalParametersField= (Map) additionalParametersField.get(newBoundSql);
for(Map.Entry entry:boundSqlAdditionalParametersField.entrySet()){
newBoundSqlObjectSqlAdditionalParametersField.put(entry.getKey(),entry.getValue());
}
Field sqlSource=MappedStatement.class.getDeclaredField("sqlSource");
sqlSource.setAccessible(true);
sqlSource.set(ms,new BoundSqlSqlSource(newBoundSql));
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
return ms;
}
@Override
public Object plugin(Object target) {
return Plugin.wrap(target, this);
}
@Override
public void setProperties(Properties properties0) {
this.properties = properties0;
}
}使用的时候，先配置数据库的SQL片段
然后配置MyBatis拦截器插件
@SpringBootApplication
@EnableSwagger2
public class StatisticsApplication {
public static void main(String[] args) {
SpringApplication.run(StatisticsApplication.class, args);
}
@Bean(name = "sqlSessionFactory")
public SqlSessionFactory sqlSessionFactory( DataSource dataSource) throws Exception {
SqlSessionFactoryBean factory = new SqlSessionFactoryBean();
factory.setDataSource(dataSource);
factory.setPlugins(new Interceptor[]{mapperInterceptor()});
ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
factory.setMapperLocations(resolver.getResources("classpath*:/mapper/*.mapper.xml"));
return factory.getObject();
}
@Bean
public MapperInterceptor mapperInterceptor() {
MapperInterceptor mapperInterceptor=new MapperInterceptor();
return mapperInterceptor;
}
}最后在Mapper接口上增加Annotation
到此，相信大家对“怎么用MyBatis进行数据权限验证”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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