MybatisPlus 自定义插件实现拦截SQL修改功能(实例详解)
作者:爱码猿
这篇文章主要介绍了MybatisPlus 自定义插件实现拦截SQL修改功能,本文通过实例代码给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友参考下吧
最近项目内使用MybatisPlus整合Phoenix实现对HBase进行操作,但是Phoenix的sql语法和MySQL不太一样,导致得在列上加@TableField申明列簇名称和列名称,不太友好,所以自己写了个插件拦截sql并进行修改
package org.gjw.config; import cn.hutool.core.util.StrUtil; import com.baomidou.mybatisplus.core.toolkit.PluginUtils; import com.baomidou.mybatisplus.extension.parser.JsqlParserSupport; import com.baomidou.mybatisplus.extension.plugins.inner.InnerInterceptor; import net.sf.jsqlparser.expression.Alias; import net.sf.jsqlparser.expression.BinaryExpression; import net.sf.jsqlparser.expression.Expression; import net.sf.jsqlparser.expression.Function; import net.sf.jsqlparser.schema.Column; import net.sf.jsqlparser.statement.delete.Delete; import net.sf.jsqlparser.statement.insert.Insert; import net.sf.jsqlparser.statement.select.*; import net.sf.jsqlparser.statement.update.Update; import org.apache.ibatis.executor.Executor; import org.apache.ibatis.executor.statement.StatementHandler; import org.apache.ibatis.mapping.BoundSql; import org.apache.ibatis.mapping.MappedStatement; import org.apache.ibatis.mapping.SqlCommandType; import org.apache.ibatis.session.ResultHandler; import org.apache.ibatis.session.RowBounds; import java.sql.Connection; import java.sql.SQLException; import java.util.List; import java.util.stream.Collectors; /** * @author guojunwang * @date 2021-11-29 17:06 */ public class PhoenixMPPlugin extends JsqlParserSupport implements InnerInterceptor { /** * 查询时处理逻辑 */ @Override public void beforeQuery(Executor executor, MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) throws SQLException { PluginUtils.MPBoundSql mpBs = PluginUtils.mpBoundSql(boundSql); //通过 JSqlParser工具修改查询sql后执行 mpBs.sql(parserSingle(mpBs.sql(), null)); } /** * 增删改时 处理逻辑 */ @Override public void beforePrepare(StatementHandler sh, Connection connection, Integer transactionTimeout) { PluginUtils.MPStatementHandler mpSh = PluginUtils.mpStatementHandler(sh); MappedStatement ms = mpSh.mappedStatement(); SqlCommandType sct = ms.getSqlCommandType(); //增删改调用 JSqlParser工具修改sql后执行 if (sct == SqlCommandType.INSERT || sct == SqlCommandType.UPDATE || sct == SqlCommandType.DELETE) { PluginUtils.MPBoundSql mpBs = mpSh.mPBoundSql(); mpBs.sql(parserMulti(mpBs.sql(), null)); } } /** * 以处理查询sql为例,增删改的实现可根据自己的业务实现 */ @Override protected void processSelect(Select select, int index, String sql, Object obj) { //此处处理select逻辑 将字符串拼接上 双引号 SelectBody selectBody = select.getSelectBody(); if(selectBody instanceof PlainSelect) reformatPlainSelect((PlainSelect) selectBody); } @Override protected void processInsert(Insert insert, int index, String sql, Object obj) { System.out.println( "新增前调用,可修改sql" ); } @Override protected void processDelete(Delete delete, int index, String sql, Object obj) { System.out.println( "删除前调用,可修改sql" ); } @Override protected void processUpdate(Update update, int index, String sql, Object obj) { System.out.println("修改调用,可修改sql"); } //---------------以下为处理sql操作,根据自己业务功能完善 /** * 处理查询字段 */ private List<SelectItem> disposeSelectColumn(List<SelectItem> selectItems){ return selectItems.stream().map( this::resetSelectItem ).collect(Collectors.toList()); } private SelectItem resetSelectItem( SelectItem selectItem ){ //如果不符合直接返回 if( !(selectItem instanceof SelectExpressionItem) ) return selectItem; SelectExpressionItem item = (SelectExpressionItem)selectItem; //如果是列 if( item.getExpression() instanceof Column ){ Column columnExp = (Column)item.getExpression(); return new SelectExpressionItem( reFormatSelectColumn( columnExp,item.getAlias() ) ); } //如果是函数 if( item.getExpression() instanceof Function){ Function function = (Function) item.getExpression(); return new SelectExpressionItem( reFormatFunction( function ) ); } return item; } /** * 重新格式化 查询语句 * @param plainSelect 查询语句 * @return 格式化的查询语句 */ public void reformatPlainSelect(PlainSelect plainSelect){ //处理要查询的字段 List<SelectItem> selectItems = plainSelect.getSelectItems(); //处理查询条件 plainSelect.setSelectItems( disposeSelectColumn( selectItems ) ); //处理 where 条件 plainSelect.setWhere( disposeSelectWhere( plainSelect.getWhere() ) ); } /** * 重新格式化列 * @param columnExp 列 * @param alias 列别名 * @return 格式化的列 */ private Column reFormatSelectColumn( Column columnExp,Alias alias ){ if( columnExp == null ) return columnExp; //表名和列簇名会在一起 String tableAndCFName= columnExp.getTable() == null ? "" : columnExp.getTable().toString(); //字段名 String columnName= columnExp.getColumnName(); //根据 `.` 分隔方便处理表名和列簇名 String[] tableAndCFInfo = tableAndCFName.split("\\."); // 可能会出现很多情况 列名 列簇.列名 表名.列簇.列名 表名.列名 String tableName = tableAndCFInfo[0]; String cf = tableAndCFInfo[tableAndCFInfo.length - 1]; //如果表名和字段名相等,只有3种情况: 列名 表名.列名 列簇.列名 if( StrUtil.equals(tableName,cf) && StrUtil.isNotBlank(tableName) ){ //判断前缀是表名还是列名 要求列簇必须全大写 表名不能全大写 //如果全大写这是列簇名 if( StrUtil.equals(cf.toUpperCase(),cf) ) { tableName = ""; }else cf = ""; //否则是表名 } StringBuilder finalName = new StringBuilder(); //如果表名不为空 拼接表名 if( StrUtil.isNotBlank( tableName ) ) finalName.append( tableName ).append( "." ); //如果列簇名不为空 拼接列簇名 if( StrUtil.isNotBlank( cf ) ) finalName.append( appendPrefixAndSuffix(cf) ).append("."); //拼接字段名 finalName.append( appendPrefixAndSuffix(columnName) ); //拼接别名: as xxx if( alias !=null ) finalName.append(" ").append( alias.getName() ); //重新格式化列名 封装返回 return new Column( finalName.toString() ); } /** * 重新格式化查询函数 * @param function 函数 * @return 格式化的函数 */ private Function reFormatFunction( Function function ){ List<Expression> expressions = function.getParameters().getExpressions(); //对于是列的参数进行格式化 expressions = expressions.stream().map(exp -> { if (exp instanceof Column) return reFormatSelectColumn((Column) exp, null); return exp; }).collect(Collectors.toList()); //重新设置回去 function.getParameters().setExpressions(expressions); return function; } /** * 重新格式化子查询 * @param subSelect 子查询 * @return 格式化的函数 */ private SubSelect reFormatSubSelect( SubSelect subSelect ){ if( subSelect.getSelectBody() instanceof PlainSelect ){ reformatPlainSelect( (PlainSelect)subSelect.getSelectBody() ); } return subSelect; } public Expression disposeSelectWhere(Expression expression){ if( !(expression instanceof BinaryExpression) ) return expression; BinaryExpression binaryExpression =(BinaryExpression)expression; //如果左边还是多条件的 if( binaryExpression.getLeftExpression() instanceof BinaryExpression){ disposeSelectWhere( binaryExpression.getLeftExpression() ); } //如果右边还是多条件的 if( binaryExpression.getRightExpression() instanceof BinaryExpression){ disposeSelectWhere( binaryExpression.getRightExpression() ); } //如果左边表达式是列信息 格式化 if( binaryExpression.getLeftExpression() instanceof Column ){ Column newColumn = reFormatSelectColumn((Column) binaryExpression.getLeftExpression(), null); binaryExpression.setLeftExpression( newColumn ); } //如果左边表达式是 子查询 processPlainSelect if(binaryExpression.getLeftExpression() instanceof SubSelect){ SubSelect subSelect = (SubSelect)binaryExpression.getLeftExpression(); if( subSelect.getSelectBody() instanceof PlainSelect ){ reformatPlainSelect( (PlainSelect)subSelect.getSelectBody() ); } } //如果右边是列信息 格式化 if( binaryExpression.getRightExpression() instanceof Column ){ Column newColumn = reFormatSelectColumn((Column) binaryExpression.getLeftExpression(), null); binaryExpression.setRightExpression( newColumn ); } //如果右边表达式是 子查询 processPlainSelect if( binaryExpression.getRightExpression() instanceof SubSelect){ SubSelect subSelect = (SubSelect)binaryExpression.getRightExpression(); reFormatSubSelect( subSelect ); } return binaryExpression; } private String appendPrefixAndSuffix(String str){ final String PREFIX = "\""; final String SUFFIX = "\""; //如果已经有前缀了直接返回 if( str.contains(PREFIX) ) return str; //拼接前缀和后缀 return new StringBuilder().append(PREFIX).append(str).append(SUFFIX).toString(); } }
使用: 编写配置类配置MybatisPlus并设置插件
@MapperScan(value = "org.gjw.mapper.phoenix",sqlSessionTemplateRef = "phoenixSqlSessionTemplate",sqlSessionFactoryRef = "phoenixSqlSessionFactory") @Configuration public class PhoenixConfig { @Bean @ConfigurationProperties("spring.datasource.phoenix") public DataSource phoenixDataSource(){ return new HikariDataSource(); } @Bean public SqlSessionFactory phoenixSqlSessionFactory( @Qualifier("phoenixDataSource") @Autowired DataSource phoenixDataSource) throws Exception { SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean(); sqlSessionFactoryBean.setDataSource( phoenixDataSource() ); sqlSessionFactoryBean.setMapperLocations( new PathMatchingResourcePatternResolver().getResources("classpath*:/phoenixMapper/**/*.xml")); MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor(); interceptor.addInnerInterceptor( new PhoenixMPPlugin() ); sqlSessionFactoryBean.setPlugins( interceptor ); MybatisConfiguration mybatisConfiguration = new MybatisConfiguration(); mybatisConfiguration.setMapUnderscoreToCamelCase(true); mybatisConfiguration.setLogImpl(StdOutImpl.class); sqlSessionFactoryBean.setConfiguration(mybatisConfiguration); return sqlSessionFactoryBean.getObject(); } @Bean public SqlSessionTemplate phoenixSqlSessionTemplate( @Qualifier("phoenixSqlSessionFactory") @Autowired SqlSessionFactory phoenixSqlSessionFactory){ return new SqlSessionTemplate( phoenixSqlSessionFactory ); } @Bean public DataSourceTransactionManager phoenixDataSourceTransactionManager(@Qualifier("phoenixDataSource") @Autowired DataSource phoenixDataSource){ return new DataSourceTransactionManager(phoenixDataSource); } }
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