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[PostgreSQL] Improve parsing support for postgresql data types #73

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[PostgreSQL] Improve parsing support for postgresql data types #73

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28d8e63
[postgres.ts] added pg-types lib to parse postgresql data types
ntma Oct 18, 2021
3c37128
[postgres] added default_value_raw to Column interface | builtin data…
ntma Nov 2, 2021
c8d9b2c
[postgres] added unit tests for default values as json[]/jsonb[]
ntma Nov 3, 2021
38fc7d2
[postgres] added parsing function for default values of type ARRAY
ntma Nov 3, 2021
9f27b8c
[postgres] improved array parser to account the {} format
ntma Nov 5, 2021
c1e3fe6
[mysql] updated mysql dialect and unit tests to account default_value…
Dec 21, 2021
b6a597d
[mysql] updated mysql dialect and unit tests to account default_value…
Dec 21, 2021
59aaa7b
[sqlite] updated sqlite dialect and unit tests to account default_val…
Dec 21, 2021
fd24e2b
[oracle] updated oracle dialect and unit tests to account default_val…
Dec 21, 2021
395a440
[postgres] less complete but more stable solution for parsing arrays
Dec 22, 2021
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1 change: 1 addition & 0 deletions lib/dialects/mssql.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@ type RawColumn = {
export function rawColumnToColumn(rawColumn: RawColumn): Column {
return {
...rawColumn,
default_value_raw: rawColumn.default_value,
default_value: parseDefaultValue(rawColumn.default_value),
generation_expression: rawColumn.generation_expression || null,
is_generated: !!rawColumn.is_generated,
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1 change: 1 addition & 0 deletions lib/dialects/mysql.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,7 @@ export function rawColumnToColumn(rawColumn: RawColumn): Column {
name: rawColumn.COLUMN_NAME,
table: rawColumn.TABLE_NAME,
data_type: dataType,
default_value_raw: rawColumn.COLUMN_DEFAULT,
default_value: parseDefaultValue(rawColumn.COLUMN_DEFAULT),
generation_expression: rawColumn.GENERATION_EXPRESSION || null,
max_length: rawColumn.CHARACTER_MAXIMUM_LENGTH,
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1 change: 1 addition & 0 deletions lib/dialects/oracledb.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@ export function rawColumnToColumn(rawColumn: RawColumn): Column {
name: rawColumn.COLUMN_NAME,
table: rawColumn.TABLE_NAME,
data_type: rawColumn.DATA_TYPE,
default_value_raw: !is_generated ? default_value : null,
default_value: !is_generated ? default_value : null,
generation_expression: is_generated ? default_value : null,
max_length: rawColumn.DATA_LENGTH,
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95 changes: 86 additions & 9 deletions lib/dialects/postgres.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,31 @@ import { Column } from '../types/column';
import { ForeignKey } from '../types/foreign-key';
import { stripQuotes } from '../utils/strip-quotes';
import isNil from 'lodash.isnil';
import { builtins, getTypeParser } from 'pg-types';

const pgTypes = builtins as any;

pgTypes['SMALLINT'] = pgTypes['INT2'];
pgTypes['INTEGER'] = pgTypes['INT4'];
pgTypes['BIGINT'] = pgTypes['INT8'];
pgTypes['REAL'] = pgTypes['FLOAT4'];
pgTypes['DOUBLE_PRECISION'] = pgTypes['FLOAT8'];
pgTypes['BOOLEAN'] = pgTypes['BOOL'];
pgTypes['CHARACTER'] = pgTypes['VARCHAR'];
pgTypes['CHARACTER_VARYING'] = pgTypes['VARCHAR'];
pgTypes['TIMESTAMP_WITHOUT_TIME_ZONE'] = pgTypes['TIMESTAMP'];
pgTypes['TIMESTAMP_WITH_TIME_ZONE'] = pgTypes['TIMESTAMPTZ'];
pgTypes['_SMALLINT'] = 1005;
pgTypes['_INTEGER'] = 1007;
pgTypes['_BIGINT'] = 1016;
pgTypes['_REAL'] = 1021;
pgTypes['_DOUBLE_PRECISION'] = 1022;
pgTypes['_BOOLEAN'] = 1000;
pgTypes['_BPCHAR'] = 1014;
pgTypes['_CHARACTER_VARYING'] = 1015;
pgTypes['_TIMESTAMP_WITHOUT_TIME_ZONE'] = 1115;
pgTypes['_TIMESTAMP_WITH_TIME_ZONE'] = 1185;
pgTypes['_DATE'] = 1182;

type RawTable = {
table_name: string;
Expand Down Expand Up @@ -39,7 +64,11 @@ export function rawColumnToColumn(rawColumn: RawColumn): Column {
name: rawColumn.column_name,
table: rawColumn.table_name,
data_type: rawColumn.data_type,
default_value: parseDefaultValue(rawColumn.column_default),
default_value_raw: rawColumn.column_default,
default_value: parseDefaultValue(
rawColumn.column_default,
rawColumn.data_type
),
generation_expression: rawColumn.generation_expression || null,
max_length: rawColumn.character_maximum_length,
numeric_precision: rawColumn.numeric_precision,
Expand All @@ -58,22 +87,70 @@ export function rawColumnToColumn(rawColumn: RawColumn): Column {
};
}

/**
* Converts Postgres default array to JS
* Eg `array['{"text":"Lorem Ipsum"}']::json[],` => [{"text":"Lorem Ipsum"}]
*/
function parseDefaultArray(column_default: string): any {
// case when '{el1,el2,el3}'::cast[]
if (column_default.startsWith("'{")) {
let [value, cast] = column_default.split('::');

cast = cast.substring(0, cast.length - 2).replace(/ /g, '_');
value = value.replace(/^\'([\s\S]*)\'$/, '$1');

const code = pgTypes['_' + cast.toUpperCase()];

const parser = getTypeParser(code);

return parser(value);
}

// case when ARRAY[el1::cast,el2::cast]
if (column_default.startsWith('ARRAY[]')) return [];

// For any other case, information_schema.data_type
// is not enough to identify the appropriate parser
// for each array element
return null;
}

/**
* Converts Postgres default value to JS
* Eg `'example'::character varying` => `example`
*/
export function parseDefaultValue(type: string | null) {
if (isNil(type)) return null;
if (type.startsWith('nextval(')) return type;
export function parseDefaultValue(
column_default: string | null,
column_type: string
) {
if (isNil(column_default)) return null;
if (column_default.startsWith('nextval(')) return column_default;

try {
if (column_type === 'ARRAY') return parseDefaultArray(column_default);

let [value, cast] = type.split('::');
let [value, cast] = column_default.split('::');
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If the value contains "::", i think you must search the last "::"


value = value.replace(/^\'([\s\S]*)\'$/, '$1');
value = value.replace(/^\'([\s\S]*)\'$/, '$1');

if (/.*json.*/.test(cast)) return JSON.parse(value);
if (/.*(char|text).*/.test(cast)) return String(value);
if (!cast) {
cast = column_type;
}

return isNaN(value as any) ? value : Number(value);
cast = cast.toUpperCase().replace(/ /g, '_');

if (!pgTypes.hasOwnProperty(cast)) {
throw `type ${cast} not supported`;
}

const code = pgTypes[cast];

const parser = getTypeParser(code);

return parser(value);
} catch (e: any) {
return null;
}
}

export default class Postgres implements SchemaInspector {
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1 change: 1 addition & 0 deletions lib/dialects/sqlite.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -154,6 +154,7 @@ export default class SQLite implements SchemaInspector {
name: raw.name,
table: table,
data_type: extractType(raw.type),
default_value_raw: raw.dflt_value,
default_value: stripQuotes(raw.dflt_value),
max_length: extractMaxLength(raw.type),
/** @NOTE SQLite3 doesn't support precision/scale */
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1 change: 1 addition & 0 deletions lib/types/column.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ export interface Column {
name: string;
table: string;
data_type: string;
default_value_raw: any | null;
default_value: any | null;
max_length: number | null;
numeric_precision: number | null;
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3 changes: 2 additions & 1 deletion package.json
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Expand Up @@ -67,6 +67,7 @@
},
"dependencies": {
"lodash.flatten": "^4.4.0",
"lodash.isnil": "^4.0.0"
"lodash.isnil": "^4.0.0",
"pg-types": "^3.0.1"
}
}
25 changes: 25 additions & 0 deletions test/mssql.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -124,6 +124,7 @@ describe('mssql', () => {
name: 'id',
table: 'teams',
data_type: 'int',
default_value_raw: null,
default_value: null,
max_length: 4,
numeric_precision: 10,
Expand All @@ -141,6 +142,7 @@ describe('mssql', () => {
name: 'uuid',
table: 'teams',
data_type: 'char',
default_value_raw: null,
default_value: null,
max_length: 36,
numeric_precision: null,
Expand All @@ -158,6 +160,7 @@ describe('mssql', () => {
name: 'name',
table: 'teams',
data_type: 'nvarchar',
default_value_raw: null,
default_value: null,
max_length: 100,
numeric_precision: null,
Expand All @@ -175,6 +178,7 @@ describe('mssql', () => {
name: 'name_upper',
table: 'teams',
data_type: 'nvarchar',
default_value_raw: null,
default_value: null,
max_length: 100,
numeric_precision: null,
Expand All @@ -192,6 +196,7 @@ describe('mssql', () => {
name: 'description',
table: 'teams',
data_type: 'varchar',
default_value_raw: null,
default_value: null,
max_length: -1,
numeric_precision: null,
Expand All @@ -209,6 +214,7 @@ describe('mssql', () => {
name: 'credits',
table: 'teams',
data_type: 'int',
default_value_raw: null,
default_value: null,
max_length: 4,
numeric_precision: 10,
Expand All @@ -226,6 +232,7 @@ describe('mssql', () => {
name: 'created_at',
table: 'teams',
data_type: 'datetime2',
default_value_raw: null,
default_value: null,
max_length: 6,
numeric_precision: 19,
Expand All @@ -243,6 +250,7 @@ describe('mssql', () => {
name: 'activated_at',
table: 'teams',
data_type: 'date',
default_value_raw: null,
default_value: null,
max_length: 3,
numeric_precision: 10,
Expand All @@ -260,6 +268,7 @@ describe('mssql', () => {
name: 'id',
table: 'users',
data_type: 'int',
default_value_raw: null,
default_value: null,
max_length: 4,
numeric_precision: 10,
Expand All @@ -277,6 +286,7 @@ describe('mssql', () => {
name: 'team_id',
table: 'users',
data_type: 'int',
default_value_raw: null,
default_value: null,
max_length: 4,
numeric_precision: 10,
Expand All @@ -294,6 +304,7 @@ describe('mssql', () => {
name: 'email',
table: 'users',
data_type: 'varchar',
default_value_raw: null,
default_value: null,
max_length: 100,
numeric_precision: null,
Expand All @@ -311,6 +322,7 @@ describe('mssql', () => {
name: 'password',
table: 'users',
data_type: 'varchar',
default_value_raw: null,
default_value: null,
max_length: 60,
numeric_precision: null,
Expand All @@ -328,6 +340,7 @@ describe('mssql', () => {
name: 'status',
table: 'users',
data_type: 'varchar',
default_value_raw: "('active')",
default_value: 'active',
max_length: 60,
numeric_precision: null,
Expand All @@ -345,6 +358,7 @@ describe('mssql', () => {
name: 'request_path',
table: 'page_visits',
data_type: 'varchar',
default_value_raw: null,
default_value: null,
max_length: 100,
numeric_precision: null,
Expand All @@ -362,6 +376,7 @@ describe('mssql', () => {
name: 'user_agent',
table: 'page_visits',
data_type: 'varchar',
default_value_raw: null,
default_value: null,
max_length: 200,
numeric_precision: null,
Expand All @@ -379,6 +394,7 @@ describe('mssql', () => {
name: 'created_at',
table: 'page_visits',
data_type: 'datetime2',
default_value_raw: null,
default_value: null,
max_length: 6,
numeric_precision: 19,
Expand All @@ -400,6 +416,7 @@ describe('mssql', () => {
name: 'id',
table: 'teams',
data_type: 'int',
default_value_raw: null,
default_value: null,
max_length: 4,
numeric_precision: 10,
Expand All @@ -417,6 +434,7 @@ describe('mssql', () => {
name: 'uuid',
table: 'teams',
data_type: 'char',
default_value_raw: null,
default_value: null,
max_length: 36,
numeric_precision: null,
Expand All @@ -434,6 +452,7 @@ describe('mssql', () => {
name: 'name',
table: 'teams',
data_type: 'nvarchar',
default_value_raw: null,
default_value: null,
max_length: 100,
numeric_precision: null,
Expand All @@ -451,6 +470,7 @@ describe('mssql', () => {
name: 'name_upper',
table: 'teams',
data_type: 'nvarchar',
default_value_raw: null,
default_value: null,
max_length: 100,
numeric_precision: null,
Expand All @@ -468,6 +488,7 @@ describe('mssql', () => {
name: 'description',
table: 'teams',
data_type: 'varchar',
default_value_raw: null,
default_value: null,
max_length: -1,
numeric_precision: null,
Expand All @@ -485,6 +506,7 @@ describe('mssql', () => {
name: 'credits',
table: 'teams',
data_type: 'int',
default_value_raw: null,
default_value: null,
max_length: 4,
numeric_precision: 10,
Expand All @@ -502,6 +524,7 @@ describe('mssql', () => {
name: 'created_at',
table: 'teams',
data_type: 'datetime2',
default_value_raw: null,
default_value: null,
max_length: 6,
numeric_precision: 19,
Expand All @@ -519,6 +542,7 @@ describe('mssql', () => {
name: 'activated_at',
table: 'teams',
data_type: 'date',
default_value_raw: null,
default_value: null,
max_length: 3,
numeric_precision: 10,
Expand All @@ -539,6 +563,7 @@ describe('mssql', () => {
name: 'uuid',
table: 'teams',
data_type: 'char',
default_value_raw: null,
default_value: null,
max_length: 36,
numeric_precision: null,
Expand Down
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