Sharding-Sphere初始化（二）

5. 开始解析insert语句，AbstractInsertParser#parse，执行nextToken获取到下一个字符段INTO，

public final DMLStatement parse() {
        lexerEngine.nextToken();
        InsertStatement result = new InsertStatement();
        insertClauseParserFacade.getInsertIntoClauseParser().parse(result);
        insertClauseParserFacade.getInsertColumnsClauseParser().parse(result, shardingMetaData);
        if (lexerEngine.equalAny(DefaultKeyword.SELECT, Symbol.LEFT_PAREN)) {
            throw new UnsupportedOperationException("Cannot INSERT SELECT");
        }
        insertClauseParserFacade.getInsertValuesClauseParser().parse(result, shardingMetaData);
        insertClauseParserFacade.getInsertSetClauseParser().parse(result);
        processGeneratedKey(result);
        return result;
    }

InsertIntoClauseParser#parse，校验不支持的关键词，如果该字段不是INTO关键词或者是Assist.END，则跳过获取下一个字符段

 public void parse(final InsertStatement insertStatement) {
        lexerEngine.unsupportedIfEqual(getUnsupportedKeywordsBeforeInto());
        lexerEngine.skipUntil(DefaultKeyword.INTO);
        lexerEngine.nextToken();
        tableReferencesClauseParser.parse(insertStatement, true);
        skipBetweenTableAndValues(insertStatement);
    }

继续获取下移字符段，表名，TableReferencesClauseParser以及子类MySQLTableReferencesClauseParser

 public final void parse(final SQLStatement sqlStatement, final boolean isSingleTableOnly) {
        do {
            parseTableReference(sqlStatement, isSingleTableOnly);
        } while (lexerEngine.skipIfEqual(Symbol.COMMA));
    }

protected void parseTableReference(final SQLStatement sqlStatement, final boolean isSingleTableOnly) {
        parseTableFactor(sqlStatement, isSingleTableOnly);
        parsePartition();
        parseIndexHint(sqlStatement);
    }

获取表名以及下标解析出正确的表名，解析别名，保存表名以及它的相关标识TableToken，解析强制走索引标识以及JOIN.最后解析分区字符段和索引标识，最后跳过一些mysql的分区关键词，完成解析。

protected final void parseTableFactor(final SQLStatement sqlStatement, final boolean isSingleTableOnly) {
        final int beginPosition = lexerEngine.getCurrentToken().getEndPosition() - lexerEngine.getCurrentToken().getLiterals().length();
        String literals = lexerEngine.getCurrentToken().getLiterals();
        int skippedSchemaNameLength = 0;
        lexerEngine.nextToken();
        if (lexerEngine.skipIfEqual(Symbol.DOT)) {
            skippedSchemaNameLength = literals.length() + Symbol.DOT.getLiterals().length();
            literals = lexerEngine.getCurrentToken().getLiterals();
        }
        String tableName = SQLUtil.getExactlyValue(literals);
        if (Strings.isNullOrEmpty(tableName)) {
            return;
        }