baomidou/mybatis-plus · error · MybatisPlusException

非法SQL，where条件中不能使用【!=】关键字，错误!=信息：{}

Error message

非法SQL，where条件中不能使用【!=】关键字，错误!=信息：{}

What it means

IllegalSQLInnerInterceptor from the jsqlparser-5.0 module: the WHERE expression (after unwrapping ParenthesedExpressionList) is a NotEqualsTo node, i.e. the SQL uses != / <>, which the interceptor's index-friendly policy forbids. Same rule as the 4.9 module, on the 5.x AST.

Source

Thrown at mybatis-plus-jsqlparser-support/mybatis-plus-jsqlparser-5.0/src/main/java/com/baomidou/mybatisplus/extension/plugins/inner/IllegalSQLInnerInterceptor.java:178

    }

    /**
     * 验证expression对象是不是 or、not等等
     *
     * @param expression ignore
     */
    private void validExpression(Expression expression) {
        while (expression instanceof ParenthesedExpressionList) {
            ParenthesedExpressionList<Expression> parenthesis = (ParenthesedExpressionList) expression;
            expression = parenthesis.get(0);
        }
        //where条件使用了 or 关键字
        if (expression instanceof OrExpression) {
            OrExpression orExpression = (OrExpression) expression;
            throw new MybatisPlusException("非法SQL，where条件中不能使用【or】关键字，错误or信息：" + orExpression.toString());
        } else if (expression instanceof NotEqualsTo) {
            NotEqualsTo notEqualsTo = (NotEqualsTo) expression;
            throw new MybatisPlusException("非法SQL，where条件中不能使用【!=】关键字，错误!=信息：" + notEqualsTo.toString());
        } else if (expression instanceof BinaryExpression) {
            BinaryExpression binaryExpression = (BinaryExpression) expression;
            // TODO 升级 jsqlparser 后待实现
//            if (binaryExpression.isNot()) {
//                throw new MybatisPlusException("非法SQL，where条件中不能使用【not】关键字，错误not信息：" + binaryExpression.toString());
//            }
            if (binaryExpression.getLeftExpression() instanceof Function) {
                Function function = (Function) binaryExpression.getLeftExpression();
                throw new MybatisPlusException("非法SQL，where条件中不能使用数据库函数，错误函数信息：" + function.toString());
            }
            if (binaryExpression.getRightExpression() instanceof Subtraction) {
                Subtraction subSelect = (Subtraction) binaryExpression.getRightExpression();
                throw new MybatisPlusException("非法SQL，where条件中不能使用子查询，错误子查询SQL信息：" + subSelect.toString());
            }
        } else if (expression instanceof InExpression) {
            InExpression inExpression = (InExpression) expression;
            if (inExpression.getRightExpression() instanceof Subtraction) {
                Subtraction subSelect = (Subtraction) inExpression.getRightExpression();

View on GitHub (pinned to bf67d90747)

Solutions

1. Rewrite as a positive predicate: deleted != 1 becomes deleted = 0 or status IN (...).
2. Use @InterceptorIgnore(illegalSql = "true") on the specific mapper method for an reviewed exception.
3. Relax policy project-wide by removing the interceptor if != predicates are accepted.

Example fix

// before
wrapper.ne(User::getDeleted, 1);

// after
wrapper.eq(User::getDeleted, 0);

// CI guard: forbid .ne( / != / <> in mapped SQL before the interceptor ever runs
// git grep -nE "\.ne\\(|<>|!=" -- src/main/resources/mapper src/main/java && { echo 'policy: no != predicates'; exit 1; }

try {
    mapper.selectList(wrapper);
} catch (MybatisPlusException e) {
    if (String.valueOf(e.getMessage()).contains("不能使用【!=】")) {
        log.error("policy violation: use eq/in instead of !=: {}", e.getMessage());
    }
}

When it happens

Trigger: Executing a query with a 'col != value' / 'col <> value' predicate — wrapper.ne(...) or hand-written SQL — while the 5.0 IllegalSQLInnerInterceptor is active.

Common situations: Soft-delete style filters (deleted != 1) written with .ne(); migrating code into a project where the interceptor was enabled, so previously-fine != predicates now throw.

Related errors

• 非法SQL，where条件中不能使用【or】关键字，错误or信息：{}
• 非法SQL，where条件中不能使用【!=】关键字，错误!=信息：{}
• 非法SQL，where条件中不能使用数据库函数，错误函数信息：{}
• 非法SQL，where条件中不能使用子查询，错误子查询SQL信息：{}
• 非法SQL，SQL未使用到索引, table:{}, columnName:{}

AI-assisted analysis of baomidou/mybatis-plus@bf67d90747 (2026-08-14). Data as JSON: /api/errors/9e8af1e54da7ac36. Report an issue: GitHub.