编写Java代码，使用druid实现sql解析血缘关系，包括表、字段血缘关系分析

以下是一个使用Druid实现SQL解析血缘关系的Java代码示例：

import com.alibaba.druid.sql.SQLUtils;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLObject;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
import com.alibaba.druid.sql.ast.statement.*;
import com.alibaba.druid.sql.parser.SQLParserUtils;
import com.alibaba.druid.sql.parser.SQLStatementParser;
import com.alibaba.druid.stat.TableStat;
import com.alibaba.druid.stat.TableStat.Column;
import com.alibaba.druid.stat.TableStat.Name;

import java.util.*;

public class SqlLineageParser {

    private Map<String, List<String>> tableMap = new HashMap<>();
    private Map<String, List<String>> columnMap = new HashMap<>();

    public void parseSqlLineage(String sql) {
        List<SQLStatement> stmtList = SQLUtils.parseStatements(sql, "mysql");
        for (SQLStatement stmt : stmtList) {
            if (stmt instanceof SQLSelectStatement) {
                SQLSelectStatement selectStmt = (SQLSelectStatement) stmt;
                SQLSelectQueryBlock queryBlock = (SQLSelectQueryBlock) selectStmt.getSelect().getQuery();

                // 解析表血缘关系
                List<SQLTableSource> fromList = queryBlock.getFrom();
                for (SQLTableSource tableSource : fromList) {
                    if (tableSource instanceof SQLExprTableSource) {
                        SQLExprTableSource exprTableSource = (SQLExprTableSource) tableSource;
                        String tableName = getTableName(exprTableSource.getExpr());
                        if (tableName != null) {
                            addTableDependency(tableName);
                        }
                    } else if (tableSource instanceof SQLJoinTableSource) {
                        SQLJoinTableSource joinTableSource = (SQLJoinTableSource) tableSource;
                        SQLTableSource left = joinTableSource.getLeft();
                        SQLTableSource right = joinTableSource.getRight();
                        if (left instanceof SQLExprTableSource) {
                            SQLExprTableSource exprTableSource = (SQLExprTableSource) left;
                            String tableName = getTableName(exprTableSource.getExpr());
                            if (tableName != null) {
                                addTableDependency(tableName);
                            }
                        }
                        if (right instanceof SQLExprTableSource) {
                            SQLExprTableSource exprTableSource = (SQLExprTableSource) right;
                            String tableName = getTableName(exprTableSource.getExpr());
                            if (tableName != null) {
                                addTableDependency(tableName);
                            }
                        }
                    }
                }

                // 解析字段血缘关系
                List<SQLSelectItem> selectList = queryBlock.getSelectList();
                for (SQLSelectItem selectItem : selectList) {
                    SQLExpr expr = selectItem.getExpr();
                    if (expr instanceof SQLIdentifierExpr) {
                        SQLIdentifierExpr identifierExpr = (SQLIdentifierExpr) expr;
                        String columnName = identifierExpr.getName();
                        String tableName = getColumnTableName(identifierExpr);
                        if (tableName != null) {
                            addColumnDependency(tableName, columnName);
                        }
                    }
                }
            }
        }
    }

    private String getTableName(SQLExpr expr) {
        if (expr instanceof SQLIdentifierExpr) {
            SQLIdentifierExpr identifierExpr = (SQLIdentifierExpr) expr;
            return identifierExpr.getName();
        } else if (expr instanceof SQLPropertyExpr) {
            SQLPropertyExpr propertyExpr = (SQLPropertyExpr) expr;
            SQLExpr owner = propertyExpr.getOwner();
            String tableName = getTableName(owner);
            if (tableName != null) {
                return tableName + "." + propertyExpr.getName();
            }
        }
        return null;
    }

    private String getColumnTableName(SQLIdentifierExpr identifierExpr) {
        String columnName = identifierExpr.getName();
        Name name = identifierExpr.name();
        Map<Name, Column> columns = TableStat.getColumns();
        for (Map.Entry<Name, Column> entry : columns.entrySet()) {
            Column column = entry.getValue();
            if (column.getName().equals(columnName)) {
                Name tableName = entry.getKey().getParent();
                return tableName.getName();
            }
        }
        return null;
    }

    private void addTableDependency(String tableName) {
        if (!tableMap.containsKey(tableName)) {
            tableMap.put(tableName, new ArrayList<>());
        }
    }

    private void addColumnDependency(String tableName, String columnName) {
        if (!columnMap.containsKey(columnName)) {
            columnMap.put(columnName, new ArrayList<>());
        }
        List<String> tableList = tableMap.get(tableName);
        if (tableList != null) {
            for (String table : tableList) {
                String column = table + "." + columnName;
                if (!columnMap.containsKey(column)) {
                    columnMap.put(column, new ArrayList<>());
                }
                columnMap.get(column).add(tableName);
            }
        }
    }

    public Map<String, List<String>> getTableMap() {
        return tableMap;
    }

    public Map<String, List<String>> getColumnMap() {
        return columnMap;
    }

    public static void main(String[] args) {
        String sql = "select t1.id, t2.name from table1 t1 join table2 t2 on t1.id = t2.id where t1.age > 18";
        SqlLineageParser parser = new SqlLineageParser();
        parser.parseSqlLineage(sql);
        System.out.println("Table Map: " + parser.getTableMap());
        System.out.println("Column Map: " + parser.getColumnMap());
    }
}

在以上代码中，我们通过Druid提供的SQL解析工具解析SQL语句，并通过解析结果获取表和字段的元数据信息。通过分析SQL语句中的表和字段引用关系，我们可以构建出表和字段的血缘关系。最后，我们可以通过getTableMap()和getColumnMap()方法获取解析结果。