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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..74ca1d3
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
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+
+[dependencies]
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diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+
+  "Additional permissions" are terms that supplement the terms of this
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+  9. Acceptance Not Required for Having Copies.
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+  You are not required to accept this License in order to receive or
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+
+  11. Patents.
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+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
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+  A contributor's "essential patent claims" are all patent claims
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+  In the following three paragraphs, a "patent license" is any express
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+actual knowledge that, but for the patent license, your conveying the
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+
+  A patent license is "discriminatory" if it does not include within
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+conditioned on the non-exercise of one or more of the rights that are
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+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
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+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
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+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c941b48
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# 大观园
+
+一人出道，全家幸福
diff --git a/config.toml b/config.toml
new file mode 100644
index 0000000..12817ea
--- /dev/null
+++ b/config.toml
@@ -0,0 +1,38 @@
+listen = "0.0.0.0:3000"
+
+[[fields]]
+id = "IDNumber"
+distinct = true
+
+[[fields]]
+id = "Name"
+
+[[fields]]
+id = "Phone"
+distinct = true
+
+[[relations]]
+name = "IdPhone"
+connect = "daigunyun.db"
+table_name = "id_phone"
+
+[[relations.fields]]
+id = "IDNumber"
+query = "idnum"
+
+[[relations.fields]]
+id = "Phone"
+query = "phone"
+
+[[relations]]
+name = "NameId"
+connect = "daigunyun.db"
+table_name = "name_id"
+
+[[relations.fields]]
+id = "IDNumber"
+query = "idnum"
+
+[[relations.fields]]
+id = "Name"
+query = "name"
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..a1c4a66
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,55 @@
+use std::fs;
+use std::path::Path;
+
+use anyhow::anyhow;
+use serde_derive::Deserialize;
+use serde_derive::Serialize;
+
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub struct Root {
+    pub listen: String,
+    pub fields: Vec<Field>,
+    pub relations: Vec<Relation>,
+}
+
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub struct Field {
+    pub id: String,
+    #[serde(default = "distinct_default")]
+    pub distinct: bool,
+}
+
+fn distinct_default() -> bool {
+    false
+}
+
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub struct Relation {
+    pub name: String,
+    pub connect: String,
+    pub table_name: String,
+    pub fields: Vec<RelationField>,
+}
+
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub struct RelationField {
+    pub id: String,
+    pub query: String,
+}
+
+pub fn read_file<P: AsRef<Path>>(path: P) -> Result<Root, anyhow::Error> {
+    let s = match fs::read_to_string(path) {
+        Ok(s) => s,
+        Err(why) => {
+            return Err(anyhow!("failed to read toml file: {}", why));
+        }
+    };
+    match toml::from_str(&*s) {
+        Ok(r) => Ok(r),
+        Err(why) => Err(anyhow!("failed to decode toml file: {}", why)),
+    }
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..3cb93db
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,301 @@
+use std::collections::{BTreeMap, HashMap, HashSet};
+use std::fmt::Debug;
+use std::hash::Hash;
+use std::sync::Arc;
+
+use anyhow::{anyhow, Error};
+use axum::{Json, Router, routing::get};
+use axum::extract::{Query, State};
+use futures_util::TryStreamExt;
+use serde_derive::{Deserialize, Serialize};
+use sqlx::{Column, Row, SqlitePool};
+use tracing::{debug, info};
+use tracing_subscriber::EnvFilter;
+
+mod config;
+
+#[derive(Clone)]
+struct AppState {
+    pub config: config::Root,
+    pub connections: Vec<RelationReader>,
+    pub field_relations: HashMap<String, Vec<RelationReader>>,
+    pub fields: HashMap<String, config::Field>,
+}
+
+#[derive(Clone)]
+struct RelationReader {
+    cfg: config::Relation,
+    db: SqlitePool,
+}
+
+impl RelationReader {
+    pub async fn from_config(cfg: &config::Relation) -> Result<RelationReader, Error> {
+        if cfg.fields.is_empty() {
+            return Err(anyhow!("relation does not have any field"));
+        }
+        match SqlitePool::connect(&cfg.connect).await {
+            Ok(p) => Ok(RelationReader {
+                cfg: cfg.clone(),
+                db: p,
+            }),
+            Err(why) => {
+                Err(anyhow!("failed to connect to sqlite database `{}` for relation {}: {}",
+                    &cfg.connect, &cfg.name, why))
+            }
+        }
+    }
+}
+
+impl RelationReader {
+    pub async fn query(&mut self, field: &String, value: &String) -> Result<HashMap<String, String>, Error> {
+        let fields = self.cfg.fields.iter().map(|r| {
+            return format!("({}) as {}", r.query, r.id);
+        }).reduce(|acc, s| acc + "," + &*s)
+            .expect("relation does not have fields");
+        let sql = format!(
+            "select {fields} from {table_name} where {field} = ?",
+            table_name = &self.cfg.table_name,
+        );
+        debug!("SQL: {}", sql);
+        let mut rows = sqlx::query(&*sql).bind(value).fetch(&self.db);
+        let mut rr: HashMap<String, String> = HashMap::new();
+        while let Some(row) = rows.try_next().await? {
+            for c in row.columns() {
+                let name = String::from(c.name());
+                let value: String = match row.try_get(&*name) {
+                    Ok(v) => v,
+                    Err(why) => {
+                        return Err(anyhow!("failed to get field `{}` when querying relation {}: {}",
+                        field, self.cfg.name, why));
+                    }
+                };
+                rr.insert(name, value);
+            }
+        }
+        Ok(rr)
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    tracing_subscriber::fmt()
+        .with_env_filter(EnvFilter::from_default_env())
+        .init();
+    debug!("debug log is enabled");
+
+    let cfg = config::read_file("config.toml")
+        .expect("error loading config file");
+
+    let field_names = get_fields(&cfg).expect("error reading fields");
+
+    let mut all_relation_names = HashSet::new();
+    for r in &cfg.relations {
+        if !all_relation_names.insert(&r.name) {
+            panic!("duplicate relation name `{r}`", r = r.name);
+        }
+        for f in &r.fields {
+            if !field_names.contains(&f.id) {
+                panic!("undeclared field `{}` used in relation `{}`, you have to declare it in `fields`",
+                       f.id, r.name);
+            }
+        }
+    }
+
+
+    let mut relations = Vec::new();
+    for r in &cfg.relations {
+        relations.push(match RelationReader::from_config(r).await {
+            Ok(v) => v,
+            Err(why) => panic!("error loading relation `{}`: {}", r.name, why),
+        });
+    }
+
+    let mut field_relations: HashMap<String, Vec<RelationReader>> = HashMap::new();
+    for r in &relations {
+        for f in &r.cfg.fields {
+            if !field_relations.contains_key(&f.id) {
+                field_relations.insert(f.id.clone(), Vec::new());
+            }
+            field_relations.get_mut(&f.id).unwrap().push(r.clone());
+        }
+    }
+
+    let fields: HashMap<String, config::Field> = cfg.fields.iter().map(|f| (f.id.clone(), f.clone())).collect();
+
+    let endpoint = cfg.listen.clone();
+
+    let state = Arc::new(AppState {
+        config: cfg,
+        connections: relations,
+        field_relations,
+        fields,
+    });
+
+    // build our application with a single route
+    let app = Router::new()
+        .route("/query", get(query))
+        .with_state(state);
+
+    // run our app with hyper, listening globally on port 3000
+    info!("starting HTTP server on {}", endpoint);
+    let listener = tokio::net::TcpListener::bind(endpoint).await
+        .expect("error binding tcp socket");
+    axum::serve(listener, app).await
+        .expect("error running http server");
+}
+
+#[derive(Eq, PartialEq, Clone)]
+#[derive(Hash)]
+struct RelationFieldValue {
+    relation: String,
+    field: String,
+    value: String,
+}
+
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub struct QueryResponse {
+    pub success: bool,
+    pub message: String,
+    pub data: BTreeMap<String, Vec<String>>,
+}
+
+
+async fn query(
+    State(state): State<Arc<AppState>>,
+    Query(args): Query<HashMap<String, String>>,
+) -> Json<QueryResponse> {
+    // Input: known field values
+    // Output: all reachable field values
+    //
+    // Program:
+    //   populate unvisited field value set with separate initial conditions
+    //   for all (field, value) in unvisited field value set:
+    //     for all relation containing this field:
+    //       mark (relation, field, value) as visited
+    //       get all other field values from relation with field, for each (field2, value2),
+    //       add all unvisited combinations (relation, field2, value2) to the unvisited field value set
+    //       stop if the unvisited set is empty, or iteration count exceeds limit
+
+    let mut unvisited = HashSet::new();
+    let mut visited = HashSet::new();
+    let known_field_values = args;
+    // for the first query, we use even non-distinct fields as query condition
+    for (field, value) in known_field_values {
+        let relations = match state.field_relations.get(&field) {
+            Some(v) => v,
+            None => {
+                return Json(QueryResponse {
+                    success: false,
+                    message: format!("no relation has field `{}`", &field),
+                    data: Default::default(),
+                });
+            }
+        };
+        for r in relations {
+            unvisited.insert(RelationFieldValue {
+                relation: r.cfg.name.clone(),
+                field: field.clone(),
+                value: value.clone(),
+            });
+        }
+    }
+    // TODO make this configurable
+    const MAX_DEPTH: i32 = 10;
+    let mut depth = 0;
+    let mut depth_limit_exceeded = false;
+    let mut all_result: HashMap<_, HashSet<String>> = HashMap::new();
+    while !unvisited.is_empty() {
+        if depth > MAX_DEPTH {
+            depth_limit_exceeded = true;
+            break;
+        }
+        // visit a cloned snapshot, updates will be reflected at once in the next loop round
+        for task in unvisited.clone() {
+            let (field, value) = (&task.field, &task.value);
+            let mut relations = match state.field_relations.get(field) {
+                Some(v) => (*v).clone(),
+                None => {
+                    return Json(QueryResponse {
+                        success: false,
+                        message: format!("no relation has field `{}`", field),
+                        data: Default::default(),
+                    });
+                }
+            };
+            for rel in relations.iter_mut() {
+                info!("visit: relation {}, field {}, value {}", rel.cfg.name, field, value);
+                // ensure every (relation, field, value) is visited only once
+                if !visited.insert(RelationFieldValue {
+                    relation: rel.cfg.name.clone(),
+                    field: field.clone(),
+                    value: value.clone(),
+                }) {
+                    continue;
+                }
+                let result = match rel.query(field, value).await {
+                    Ok(v) => v,
+                    Err(why) => {
+                        return Json(QueryResponse {
+                            success: false,
+                            message: format!("failed to query relation `{r}` with field `{f}`, value `{v}`: {why}",
+                                             r = &rel.cfg.name, f = field, v = value),
+                            data: Default::default(),
+                        });
+                    }
+                };
+                for (field, value) in result {
+                    let v = RelationFieldValue {
+                        relation: rel.cfg.name.clone(),
+                        field: field.clone(),
+                        value: value.clone(),
+                    };
+                    // skip non-distinct fields to prevent generating irrelevant results
+                    if !state.fields.get(&field).expect("missing field info").distinct {
+                        continue;
+                    }
+                    if visited.contains(&v) {
+                        // don't re-add visited values
+                        continue;
+                    }
+                    unvisited.insert(v);
+                    if let Some(set) = all_result.get_mut(&field) {
+                        set.insert(value);
+                    } else {
+                        let mut s = HashSet::new();
+                        s.insert(value);
+                        all_result.insert(field, s);
+                    }
+                }
+                unvisited.remove(&RelationFieldValue {
+                    relation: rel.cfg.name.clone(),
+                    field: field.clone(),
+                    value: value.clone(),
+                });
+            }
+        }
+        depth += 1;
+    }
+    // use BTree map to keep the result ordered
+    let all_result: BTreeMap<String, Vec<String>> = all_result.iter().map(|(k, v)| {
+        let mut v: Vec<String> = v.iter().map(|v| v.clone()).collect();
+        v.sort();
+        (k.clone(), v)
+    }).collect();
+    Json(QueryResponse {
+        success: true,
+        message: String::from(if depth_limit_exceeded { "depth length limit exceeded" } else { "" }),
+        data: all_result,
+    })
+}
+
+
+fn get_fields(cfg: &config::Root) -> Result<HashSet<String>, anyhow::Error> {
+    let mut s: HashSet<String> = HashSet::new();
+    for field in &cfg.fields {
+        if !s.insert(field.id.clone()) {
+            return Err(anyhow!("duplicate field `{:?}`", &field.id));
+        }
+    }
+    Ok(s)
+}
\ No newline at end of file