mybatis插件实现自定义改写表名实例代码

代码如下：

@Intercepts({@Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class}),
    @Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class}),})
public class RerouteToTableInterceptor implements Interceptor {
    private Map map;
    private Set<String> tableSet;
    public static boolean openInterceptor = false;
    public RerouteToTableInterceptor() {
        //标识使用了该插件
        setOpenInterceptor(true);
    }
    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        Object[] args = invocation.getArgs();
        MappedStatement ms = (MappedStatement) args[0];
        Object parameterObject = args[1];
        BoundSql boundSql = ms.getBoundSql(parameterObject);
        String sql = boundSql.getSql();
        MySqlStatementParser mySqlStatementParser = new MySqlStatementParser(sql);
        SQLStatement statement = mySqlStatementParser.parseStatement();
        SQLExprTableSource sqlTableSource = null;
        if(statement instanceof SQLSelectStatement){
            SQLSelect selectQuery = ((SQLSelectStatement)statement).getSelect();
            MySqlSelectQueryBlock sqlSelectQuery = (MySqlSelectQueryBlock)selectQuery.getQuery();
            sqlTableSource = (SQLExprTableSource)sqlSelectQuery.getFrom();
        }else if(statement instanceof SQLInsertStatement){
            SQLInsertStatement sqlInsertStatement = (SQLInsertStatement)statement;
            sqlTableSource = sqlInsertStatement.getTableSource();
        }else if(statement instanceof SQLUpdateStatement){
            SQLUpdateStatement sqlUpdateStatement = (SQLUpdateStatement)statement;
            sqlTableSource = (SQLExprTableSource)sqlUpdateStatement.getTableSource();
        }else if(statement instanceof SQLDeleteStatement){
            SQLDeleteStatement sqlUpdateStatement = (SQLDeleteStatement)statement;
            sqlTableSource = (SQLExprTableSource)sqlUpdateStatement.getTableSource();
        }
        String tableName = sqlTableSource.toString();
        if(tableSet.contains(tableName)){
            SQLIdentifierExpr sqlExpr = (SQLIdentifierExpr)sqlTableSource.getExpr();
            String newTableName = (String)map.get(tableName);
            if(!StringUtils.isEmpty(newTableName) && null != newTableName)
                sqlExpr.setName(newTableName);
        }

        BoundSql bs = new BoundSql(ms.getConfiguration(),statement.toString(),boundSql.getParameterMappings(),parameterObject);

        MappedStatement newMs = copyFromMappedStatement(ms, new BoundSqlSqlSource(bs));
        for (ParameterMapping mapping : boundSql.getParameterMappings()) {
            String prop = mapping.getProperty();
            if (boundSql.hasAdditionalParameter(prop)) {
                bs.setAdditionalParameter(prop, boundSql.getAdditionalParameter(prop));
            }
        }
        args[0] = newMs;

        return invocation.proceed();
    }

    @Override
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }

    @Override
    public void setProperties(Properties properties) {}

    public Map getMap() {
        return map;
    }

    public void setMap(Map map) {
        tableSet = map.keySet();
        this.map = map;
    }
    public boolean isOpenInterceptor() {
        return openInterceptor;
    }

    public void setOpenInterceptor(boolean openInterceptor) {
        this.openInterceptor = openInterceptor;
    }

    private MappedStatement copyFromMappedStatement(MappedStatement ms, SqlSource newSqlSource) {
        MappedStatement.Builder builder = new MappedStatement.Builder(ms.getConfiguration(), ms.getId(), newSqlSource, ms.getSqlCommandType());
        builder.resource(ms.getResource());
        builder.fetchSize(ms.getFetchSize());
        builder.statementType(ms.getStatementType());
        builder.keyGenerator(ms.getKeyGenerator());
        if (ms.getKeyProperties() != null && ms.getKeyProperties().length > 0) {
            builder.keyProperty(ms.getKeyProperties()[0]);
        }
        builder.timeout(ms.getTimeout());
        builder.parameterMap(ms.getParameterMap());
        builder.resultMaps(ms.getResultMaps());
        builder.resultSetType(ms.getResultSetType());
        builder.cache(ms.getCache());
        builder.flushCacheRequired(ms.isFlushCacheRequired());
        builder.useCache(ms.isUseCache());
        return builder.build();
    }

    public static class BoundSqlSqlSource implements SqlSource {
        private BoundSql boundSql;
        public BoundSqlSqlSource(BoundSql boundSql) {
            this.boundSql = boundSql;
        }
        public BoundSql getBoundSql(Object parameterObject) {
            return boundSql;
        }
    }
}

总结

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