sql-gen 0.1.3

A CLI tool for generating models based on a SQL Database using SQLx
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133

use sqlx::postgres::PgPoolOptions;
use sqlx::PgPool;
use std::fs;
use std::path::Path;

use crate::db_queries::get_table_columns;
use crate::models::TableColumn;
use crate::utils::{generate_struct_code, to_pascal_case, to_snake_case};

use crate::query_generate::generate_query_code;

pub async fn generate(
    output_folder: &str,
    database_url: &str,
    context: Option<&str>,
    force: bool,
    include_tables: Option<Vec<&str>>,
    schemas: Option<Vec<&str>>,
) -> Result<(), Box<dyn std::error::Error>> {
    // Connect to the Postgres database
    let pool = PgPoolOptions::new()
        .max_connections(5)
        .connect(database_url)
        .await?;

    let database_name = get_database_name(&pool).await?;
    println!("Generating for database: {}", database_name);

    let default_schema = "public";
    let rows = get_table_columns(&pool, schemas.unwrap_or(vec![default_schema]), None).await?;

    // Create the output folder if it doesn't exist
    fs::create_dir_all(output_folder)?;

    let mut unique = std::collections::BTreeSet::new();
    for row in &rows {
        unique.insert(row.table_name.clone());
    }
    let tables: Vec<String> = unique.into_iter().collect::<Vec<String>>();

    println!("Outputting tables: {:?}", tables);

    // Generate structs and queries for each table
    for table in &tables {
        if let Some(ts) = include_tables.clone() {
            if !ts.contains(&table.as_str()) {
                continue;
            }
        }
        // Generate the struct code based on the row
        let struct_code = generate_struct_code(&table, &rows);

        // Generate the query code based on the row
        let query_code = generate_query_code(&table, &rows);

        let struct_file_path = format!("{}/{}.rs", output_folder, to_snake_case(&table));
        if Path::new(&struct_file_path).exists() && !force {
            eprintln!(
                "{} already exists, skipping. use --force flag to overwrite",
                struct_file_path
            );
        } else {
            fs::write(struct_file_path, struct_code)?;
        }

        // Write the query code to a file
        let query_file_path = format!("{}/{}_db_set.rs", output_folder, to_snake_case(&table));
        if Path::new(&query_file_path).exists() && !force {
            eprintln!(
                "{} already exists, skipping. use --force flag to overwrite",
                query_file_path
            );
        } else {
            fs::write(query_file_path, query_code)?;
        }
    }

    let context_code = generate_db_context(context.unwrap_or(&database_name), &tables, &rows);
    let context_file_path = format!("{}/mod.rs", output_folder);
    fs::write(context_file_path, context_code)?;
    Ok(())
}

fn generate_db_context(database_name: &str, tables: &[String], _rows: &[TableColumn]) -> String {
    let mut db_context_code = String::new();

    db_context_code
        .push_str("//Generated with SQLGEN\n//https://github.com/jayy-lmao/sql-codegen\n\n");
    for table in tables {
        db_context_code.push_str(&format!("pub mod {};\n", to_snake_case(table)));
        db_context_code.push_str(&format!(
            "pub use {}::{};\n",
            to_snake_case(table),
            to_pascal_case(table),
        ));
        db_context_code.push_str(&format!("pub mod {}_db_set;\n", to_snake_case(table)));
        db_context_code.push_str(&format!(
            "pub use {}_db_set::{}Set;\n\n",
            to_snake_case(table),
            to_pascal_case(table),
        ));
    }

    db_context_code.push_str("\n");
    db_context_code.push_str(&format!(
        "pub struct {}Context;\n\n",
        to_pascal_case(database_name)
    ));
    db_context_code.push_str(&format!(
        "impl {}Context {{\n",
        to_pascal_case(database_name)
    ));
    for table in tables {
        db_context_code.push_str(&format!(
            "  pub fn {}(&self) -> {}Set {{ {}Set }}\n\n",
            to_snake_case(table),
            to_pascal_case(table),
            to_pascal_case(table),
        ));
    }
    db_context_code.push_str("}");
    db_context_code
}

async fn get_database_name(pool: &PgPool) -> Result<String, sqlx::Error> {
    let query = "SELECT current_database()";
    let row: (String,) = sqlx::query_as::<_, (String,)>(query)
        .fetch_one(pool)
        .await?;
    let database_name = row.0;

    Ok(database_name)
}