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@@ -0,0 +1,436 @@
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+package com.fjhx.config;
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+
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+import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
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+import com.baomidou.mybatisplus.core.toolkit.PluginUtils;
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+import com.baomidou.mybatisplus.core.toolkit.StringPool;
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+import com.baomidou.mybatisplus.extension.plugins.inner.InnerInterceptor;
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+import lombok.SneakyThrows;
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+import lombok.extern.slf4j.Slf4j;
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+import net.sf.jsqlparser.JSQLParserException;
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+import net.sf.jsqlparser.expression.*;
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+import net.sf.jsqlparser.expression.operators.conditional.AndExpression;
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+import net.sf.jsqlparser.expression.operators.conditional.OrExpression;
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+import net.sf.jsqlparser.expression.operators.relational.EqualsTo;
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+import net.sf.jsqlparser.expression.operators.relational.ExistsExpression;
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+import net.sf.jsqlparser.expression.operators.relational.ExpressionList;
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+import net.sf.jsqlparser.expression.operators.relational.InExpression;
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+import net.sf.jsqlparser.parser.CCJSqlParserUtil;
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+import net.sf.jsqlparser.schema.Column;
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+import net.sf.jsqlparser.schema.Table;
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+import net.sf.jsqlparser.statement.select.*;
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+import org.apache.ibatis.executor.Executor;
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+import org.apache.ibatis.mapping.BoundSql;
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+import org.apache.ibatis.mapping.MappedStatement;
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+import org.apache.ibatis.session.ResultHandler;
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+import org.apache.ibatis.session.RowBounds;
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+import org.springframework.stereotype.Component;
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+
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+import java.util.*;
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+import java.util.stream.Collectors;
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+
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+@Component
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+@Slf4j
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+public class LogicDeleteInterceptor implements InnerInterceptor {
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+
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+ private static final String delFlagName = "del_flag";
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+ private static final Expression delFlagValue = new LongValue(0);
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+ private final List<String> excludeDelFlagTableNameList;
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+
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+ public LogicDeleteInterceptor(List<String> excludeDelFlagTableNameList) {
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+ this.excludeDelFlagTableNameList = excludeDelFlagTableNameList;
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+ }
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+
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+ @SneakyThrows
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+ @Override
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+ public void beforeQuery(Executor executor, MappedStatement ms, Object parameter, RowBounds rowBounds,
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+ ResultHandler resultHandler, BoundSql boundSql) {
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+
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+ PluginUtils.MPBoundSql mpBs = PluginUtils.mpBoundSql(boundSql);
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+ mpBs.sql(handleSql(boundSql.getSql()));
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+ }
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+
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+ /**
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+ * 改写SQL
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+ * {@link com.baomidou.mybatisplus.extension.plugins.inner.TenantLineInnerInterceptor processSelect 方法}
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+ *
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+ * @param sql 执行的SQL语句
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+ * @return 处理后的SQL
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+ */
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+ private String handleSql(String sql) throws JSQLParserException {
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+ Select select = (Select) CCJSqlParserUtil.parse(sql);
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+ processSelectBody(select.getSelectBody());
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+ List<WithItem> withItemsList = select.getWithItemsList();
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+ if (!CollectionUtils.isEmpty(withItemsList)) {
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+ withItemsList.forEach(this::processSelectBody);
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+ }
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+ return select.toString();
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+ }
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+
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+ protected void processSelectBody(SelectBody selectBody) {
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+ if (selectBody == null) {
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+ return;
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+ }
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+ if (selectBody instanceof PlainSelect) {
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+ processPlainSelect((PlainSelect) selectBody);
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+ } else if (selectBody instanceof WithItem) {
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+ WithItem withItem = (WithItem) selectBody;
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+ processSelectBody(withItem.getSubSelect().getSelectBody());
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+ } else {
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+ SetOperationList operationList = (SetOperationList) selectBody;
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+ List<SelectBody> selectBodyList = operationList.getSelects();
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+ if (CollectionUtils.isNotEmpty(selectBodyList)) {
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+ selectBodyList.forEach(this::processSelectBody);
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+ }
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+ }
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+ }
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+
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+ /**
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+ * 处理 PlainSelect
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+ */
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+ protected void processPlainSelect(PlainSelect plainSelect) {
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+ //#3087 github
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+ List<SelectItem> selectItems = plainSelect.getSelectItems();
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+ if (CollectionUtils.isNotEmpty(selectItems)) {
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+ selectItems.forEach(this::processSelectItem);
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+ }
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+
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+ // 处理 where 中的子查询
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+ Expression where = plainSelect.getWhere();
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+ processWhereSubSelect(where);
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+
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+ // 处理 fromItem
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+ FromItem fromItem = plainSelect.getFromItem();
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+ List<Table> list = processFromItem(fromItem);
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+ List<Table> mainTables = new ArrayList<>(list);
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+
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+ // 处理 join
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+ List<Join> joins = plainSelect.getJoins();
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+ if (CollectionUtils.isNotEmpty(joins)) {
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+ mainTables = processJoins(mainTables, joins);
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+ }
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+
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+ // 当有 mainTable 时,进行 where 条件追加
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+ if (CollectionUtils.isNotEmpty(mainTables) && (where == null || !where.toString().contains(delFlagName))) {
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+ plainSelect.setWhere(builderExpression(where, mainTables));
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+ }
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+ }
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+
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+ /**
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+ * 处理where条件内的子查询
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+ * <p>
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+ * 支持如下:
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+ * 1. in
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+ * 2. =
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+ * 3. >
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+ * 4. <
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+ * 5. >=
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+ * 6. <=
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+ * 7. <>
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+ * 8. EXISTS
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+ * 9. NOT EXISTS
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+ * <p>
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+ * 前提条件:
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+ * 1. 子查询必须放在小括号中
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+ * 2. 子查询一般放在比较操作符的右边
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+ *
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+ * @param where where 条件
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+ */
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+ protected void processWhereSubSelect(Expression where) {
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+ if (where == null) {
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+ return;
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+ }
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+ if (where instanceof FromItem) {
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+ processOtherFromItem((FromItem) where);
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+ return;
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+ }
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+ if (where.toString().indexOf("SELECT") > 0) {
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+ // 有子查询
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+ if (where instanceof BinaryExpression) {
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+ // 比较符号 , and , or , 等等
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+ BinaryExpression expression = (BinaryExpression) where;
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+ processWhereSubSelect(expression.getLeftExpression());
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+ processWhereSubSelect(expression.getRightExpression());
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+ } else if (where instanceof InExpression) {
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+ // in
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+ InExpression expression = (InExpression) where;
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+ Expression inExpression = expression.getRightExpression();
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+ if (inExpression instanceof SubSelect) {
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+ processSelectBody(((SubSelect) inExpression).getSelectBody());
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+ }
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+ } else if (where instanceof ExistsExpression) {
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+ // exists
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+ ExistsExpression expression = (ExistsExpression) where;
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+ processWhereSubSelect(expression.getRightExpression());
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+ } else if (where instanceof NotExpression) {
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+ // not exists
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+ NotExpression expression = (NotExpression) where;
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+ processWhereSubSelect(expression.getExpression());
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+ } else if (where instanceof Parenthesis) {
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+ Parenthesis expression = (Parenthesis) where;
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+ processWhereSubSelect(expression.getExpression());
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+ }
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+ }
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+ }
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+
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+ protected void processSelectItem(SelectItem selectItem) {
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+ if (selectItem instanceof SelectExpressionItem) {
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+ SelectExpressionItem selectExpressionItem = (SelectExpressionItem) selectItem;
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+ if (selectExpressionItem.getExpression() instanceof SubSelect) {
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+ processSelectBody(((SubSelect) selectExpressionItem.getExpression()).getSelectBody());
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+ } else if (selectExpressionItem.getExpression() instanceof Function) {
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+ processFunction((Function) selectExpressionItem.getExpression());
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+ }
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+ }
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+ }
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+
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+ private List<Table> processFromItem(FromItem fromItem) {
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+ // 处理括号括起来的表达式
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+ while (fromItem instanceof ParenthesisFromItem) {
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+ fromItem = ((ParenthesisFromItem) fromItem).getFromItem();
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+ }
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+
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+ List<Table> mainTables = new ArrayList<>();
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+ // 无 join 时的处理逻辑
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+ if (fromItem instanceof Table) {
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+ Table fromTable = (Table) fromItem;
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+ mainTables.add(fromTable);
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+ } else if (fromItem instanceof SubJoin) {
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+ // SubJoin 类型则还需要添加上 where 条件
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+ List<Table> tables = processSubJoin((SubJoin) fromItem);
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+ mainTables.addAll(tables);
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+ } else {
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+ // 处理下 fromItem
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+ processOtherFromItem(fromItem);
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+ }
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+ return mainTables;
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+ }
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+
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+ /**
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+ * 处理子查询等
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+ */
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+ protected void processOtherFromItem(FromItem fromItem) {
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+ // 去除括号
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+ while (fromItem instanceof ParenthesisFromItem) {
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+ fromItem = ((ParenthesisFromItem) fromItem).getFromItem();
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+ }
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+
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+ if (fromItem instanceof SubSelect) {
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+ SubSelect subSelect = (SubSelect) fromItem;
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+ if (subSelect.getSelectBody() != null) {
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+ processSelectBody(subSelect.getSelectBody());
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+ }
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+ } else if (fromItem instanceof ValuesList) {
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+ log.debug("Perform a subQuery, if you do not give us feedback");
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+ } else if (fromItem instanceof LateralSubSelect) {
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+ LateralSubSelect lateralSubSelect = (LateralSubSelect) fromItem;
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+ if (lateralSubSelect.getSubSelect() != null) {
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+ SubSelect subSelect = lateralSubSelect.getSubSelect();
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+ if (subSelect.getSelectBody() != null) {
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+ processSelectBody(subSelect.getSelectBody());
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+ }
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+ }
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+ }
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+ }
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+
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+ /**
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+ * 处理 sub join
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+ *
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+ * @param subJoin subJoin
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+ * @return Table subJoin 中的主表
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+ */
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+ private List<Table> processSubJoin(SubJoin subJoin) {
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+ List<Table> mainTables = new ArrayList<>();
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+ if (subJoin.getJoinList() != null) {
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+ List<Table> list = processFromItem(subJoin.getLeft());
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+ mainTables.addAll(list);
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+ mainTables = processJoins(mainTables, subJoin.getJoinList());
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+ }
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+ return mainTables;
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+ }
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+
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+
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+ /**
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+ * 处理函数
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+ * <p>支持: 1. select fun(args..) 2. select fun1(fun2(args..),args..)<p>
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+ * <p> fixed gitee pulls/141</p>
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+ *
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+ * @param function
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+ */
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+ protected void processFunction(Function function) {
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+ ExpressionList parameters = function.getParameters();
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+ if (parameters != null) {
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+ parameters.getExpressions().forEach(expression -> {
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+ if (expression instanceof SubSelect) {
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+ processSelectBody(((SubSelect) expression).getSelectBody());
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+ } else if (expression instanceof Function) {
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+ processFunction((Function) expression);
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+ }
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+ });
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+ }
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+ }
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+
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+ /**
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+ * 处理 joins
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+ *
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+ * @param mainTables 可以为 null
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+ * @param joins join 集合
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+ * @return List<Table> 右连接查询的 Table 列表
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+ */
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+ private List<Table> processJoins(List<Table> mainTables, List<Join> joins) {
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+ // join 表达式中最终的主表
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+ Table mainTable = null;
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+ // 当前 join 的左表
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+ Table leftTable = null;
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+
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+ if (mainTables == null) {
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+ mainTables = new ArrayList<>();
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+ } else if (mainTables.size() == 1) {
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+ mainTable = mainTables.get(0);
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+ leftTable = mainTable;
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+ }
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+
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+ // 对于 on 表达式写在最后的 join,需要记录下前面多个 on 的表名
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+ Deque<List<Table>> onTableDeque = new LinkedList<>();
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+ for (Join join : joins) {
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+ // 处理 on 表达式
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+ FromItem joinItem = join.getRightItem();
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+
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+ // 获取当前 join 的表,subJoint 可以看作是一张表
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+ List<Table> joinTables = null;
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+ if (joinItem instanceof Table) {
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+ joinTables = new ArrayList<>();
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+ joinTables.add((Table) joinItem);
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+ } else if (joinItem instanceof SubJoin) {
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+ joinTables = processSubJoin((SubJoin) joinItem);
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+ }
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+
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+ if (joinTables != null) {
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+
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+ // 如果是隐式内连接
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+ if (join.isSimple()) {
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+ mainTables.addAll(joinTables);
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+ continue;
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+ }
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+
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+ // 当前表是否忽略
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+ Table joinTable = joinTables.get(0);
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+
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+ List<Table> onTables = null;
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+ // 如果不要忽略,且是右连接,则记录下当前表
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+ if (join.isRight()) {
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+ mainTable = joinTable;
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+ if (leftTable != null) {
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+ onTables = Collections.singletonList(leftTable);
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+ }
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+ } else if (join.isLeft()) {
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+ onTables = Collections.singletonList(joinTable);
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+ } else if (join.isInner()) {
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+ if (mainTable == null) {
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+ onTables = Collections.singletonList(joinTable);
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+ } else {
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+ onTables = Arrays.asList(mainTable, joinTable);
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+ }
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+ mainTable = null;
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+ }
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+
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+ mainTables = new ArrayList<>();
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+ if (mainTable != null) {
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+ mainTables.add(mainTable);
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+ }
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+
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+ // 获取 join 尾缀的 on 表达式列表
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+ Collection<Expression> originOnExpressions = join.getOnExpressions();
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+ // 正常 join on 表达式只有一个,立刻处理
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+ if (originOnExpressions.size() == 1 && onTables != null) {
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+ List<Expression> onExpressions = new LinkedList<>();
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+ onExpressions.add(builderExpression(originOnExpressions.iterator().next(), onTables));
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+ join.setOnExpressions(onExpressions);
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+ leftTable = joinTable;
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+ continue;
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+ }
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+ // 表名压栈,忽略的表压入 null,以便后续不处理
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+ onTableDeque.push(onTables);
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+ // 尾缀多个 on 表达式的时候统一处理
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+ if (originOnExpressions.size() > 1) {
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+ Collection<Expression> onExpressions = new LinkedList<>();
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+ for (Expression originOnExpression : originOnExpressions) {
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+ List<Table> currentTableList = onTableDeque.poll();
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+ if (CollectionUtils.isEmpty(currentTableList)) {
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+ onExpressions.add(originOnExpression);
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+ } else {
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+ onExpressions.add(builderExpression(originOnExpression, currentTableList));
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+ }
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+ }
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+ join.setOnExpressions(onExpressions);
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+ }
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+ leftTable = joinTable;
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+ } else {
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+ processOtherFromItem(joinItem);
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+ leftTable = null;
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+ }
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+ }
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+
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+ return mainTables;
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+ }
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+
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+ /**
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+ * 处理条件
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+ */
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+ protected Expression builderExpression(Expression currentExpression, List<Table> tables) {
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+ // 没有表需要处理直接返回
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+ if (CollectionUtils.isEmpty(tables)) {
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+ return currentExpression;
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+ }
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+ // 构造每张表的条件
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+ List<Table> tempTables = tables.stream()
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+ .filter(x -> !excludeDelFlagTableNameList.contains(x.getName()))
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+ .collect(Collectors.toList());
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+
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+ // 没有表需要处理直接返回
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+ if (CollectionUtils.isEmpty(tempTables)) {
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+ return currentExpression;
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+ }
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+
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+ List<EqualsTo> equalsTos = tempTables.stream()
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+ .map(item -> new EqualsTo(getAliasColumn(item), delFlagValue))
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+ .collect(Collectors.toList());
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+
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+ // 注入的表达式
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+ Expression injectExpression = equalsTos.get(0);
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+ // 如果有多表,则用 and 连接
|
|
|
+ if (equalsTos.size() > 1) {
|
|
|
+ for (int i = 1; i < equalsTos.size(); i++) {
|
|
|
+ injectExpression = new AndExpression(injectExpression, equalsTos.get(i));
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (currentExpression == null) {
|
|
|
+ return injectExpression;
|
|
|
+ }
|
|
|
+ if (currentExpression instanceof OrExpression) {
|
|
|
+ return new AndExpression(new Parenthesis(currentExpression), injectExpression);
|
|
|
+ } else {
|
|
|
+ return new AndExpression(currentExpression, injectExpression);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * 租户字段别名设置
|
|
|
+ * <p>tenantId 或 tableAlias.tenantId</p>
|
|
|
+ *
|
|
|
+ * @param table 表对象
|
|
|
+ * @return 字段
|
|
|
+ */
|
|
|
+ protected Column getAliasColumn(Table table) {
|
|
|
+ StringBuilder column = new StringBuilder();
|
|
|
+ // 为了兼容隐式内连接,没有别名时条件就需要加上表名
|
|
|
+ if (table.getAlias() != null) {
|
|
|
+ column.append(table.getAlias().getName());
|
|
|
+ } else {
|
|
|
+ column.append(table.getName());
|
|
|
+ }
|
|
|
+ column.append(StringPool.DOT).append(delFlagName);
|
|
|
+ return new Column(column.toString());
|
|
|
+ }
|
|
|
+
|
|
|
+}
|