rok-sqlc 0.3.0

Generate SQLx Rust database modules from SQL schema files
Documentation 
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
134
135

//! `create`: a static insert, or one built at runtime when columns have
//! defaults.

use crate::schema::{Column, Table};

use super::{push_returning, returning_clause};
use crate::generator::sql::{ident, str_literal, table_ref};
use crate::generator::{
    StaticQuery, insert_bind, keys, push_and_chain, push_build_and_fetch, push_doc, push_fn_head,
    push_let_call,
};

fn push_create_head(output: &mut String, table: &Table, doc: &[&str]) {
    output.push('\n');
    push_doc(output, 0, doc);
    push_fn_head(
        output,
        "create",
        &keys::scoped_params(table, &[format!("input: New{}", table.struct_name)]),
        &format!("Result<{}, sqlx::Error>", table.struct_name),
    );
}

pub(super) fn render_static_create(output: &mut String, table: &Table, columns: &[&Column]) {
    let names: Vec<String> = table
        .tenant()
        .into_iter()
        .chain(columns.iter().copied())
        .map(|column| ident(&column.sql_name))
        .collect();
    let placeholders: Vec<String> = (1..=names.len()).map(|index| format!("${index}")).collect();
    let mut sql = vec![
        format!("INSERT INTO {} ({})", table_ref(table), names.join(", ")),
        format!("VALUES ({})", placeholders.join(", ")),
    ];
    sql.extend(returning_clause(table));

    push_create_head(
        output,
        table,
        &["Inserts one row and returns it as stored."],
    );
    StaticQuery {
        call: &format!("sqlx::query_as::<_, {}>", table.struct_name),
        sql,
        binds: keys::tenant_bind(table)
            .into_iter()
            .chain(columns.iter().map(|column| insert_bind(column)))
            .collect(),
        execute: "fetch_one(executor)",
    }
    .push(output, 4, "", "");
    output.push_str("}\n");
}

pub(super) fn render_dynamic_create(output: &mut String, table: &Table, columns: &[&Column]) {
    push_create_head(
        output,
        table,
        &[
            "Inserts one row and returns it as stored. Defaulted columns left as `None`",
            "are omitted from the `INSERT` so the database default applies.",
        ],
    );

    // When every insertable column is defaulted, an all-`None` input lists no
    // columns at all, which only `DEFAULT VALUES` can express. A tenant table
    // always lists its tenant column.
    if table.tenant().is_none() && columns.iter().all(|column| column.is_omittable_on_insert()) {
        let terms: Vec<String> = columns
            .iter()
            .map(|column| format!("input.{}.is_none()", column.rust_name))
            .collect();
        push_and_chain(output, 4, "if ", &terms, " {");
        let mut sql = vec![
            format!("INSERT INTO {}", table_ref(table)),
            "DEFAULT VALUES".to_owned(),
        ];
        sql.extend(returning_clause(table));
        StaticQuery {
            call: &format!("sqlx::query_as::<_, {}>", table.struct_name),
            sql,
            binds: Vec::new(),
            execute: "fetch_one(executor)",
        }
        .push(output, 8, "return ", ";");
        output.push_str("    }\n\n");
    }

    push_let_call(
        output,
        4,
        "let mut query",
        "sqlx::QueryBuilder::<sqlx::Postgres>::new",
        &str_literal(&format!("INSERT INTO {} (", table_ref(table))),
    );
    output.push_str("    let mut columns = query.separated(\", \");\n");
    if let Some(tenant) = table.tenant() {
        output.push_str(&format!(
            "    columns.push({});\n",
            str_literal(&ident(&tenant.sql_name))
        ));
    }
    for column in columns {
        let name = str_literal(&ident(&column.sql_name));
        if column.is_omittable_on_insert() {
            output.push_str(&format!("    if input.{}.is_some() {{\n", column.rust_name));
            output.push_str(&format!("        columns.push({name});\n"));
            output.push_str("    }\n");
        } else {
            output.push_str(&format!("    columns.push({name});\n"));
        }
    }
    output.push_str("    query.push(\") VALUES (\");\n");
    output.push_str("    let mut values = query.separated(\", \");\n");
    if let Some(tenant) = keys::tenant_bind(table) {
        output.push_str(&format!("    values.push_bind({tenant});\n"));
    }
    for column in columns {
        if column.is_omittable_on_insert() {
            output.push_str(&format!(
                "    if let Some(value) = input.{} {{\n",
                column.rust_name
            ));
            output.push_str("        values.push_bind(value);\n");
            output.push_str("    }\n");
        } else {
            output.push_str(&format!("    values.push_bind({});\n", insert_bind(column)));
        }
    }
    output.push_str("    query.push(\")\");\n");
    push_returning(output, table);
    push_build_and_fetch(output, table, "fetch_one");
    output.push_str("}\n");
}