fix: Migration issues with scale & precision in sqlite/sql.js

src/driver/sqlite-abstract/AbstractSqliteDriver.ts

@@ -130,12 +130,31 @@ export abstract class AbstractSqliteDriver implements Driver {
     /**
      * Gets list of column data types that support precision by a driver.
      */
-    withPrecisionColumnTypes: ColumnType[] = [];
+    withPrecisionColumnTypes: ColumnType[] = [
+        "real",
+        "double",
+        "double precision",
+        "float",
+        "real",
+        "numeric",
+        "decimal",
+        "date",
+        "time",
+        "datetime"
+    ];
 
     /**
      * Gets list of column data types that support scale by a driver.
      */
-    withScaleColumnTypes: ColumnType[] = [];
+    withScaleColumnTypes: ColumnType[] = [
+        "real",
+        "double",
+        "double precision",
+        "float",
+        "real",
+        "numeric",
+        "decimal",
+    ];
 
     /**
      * Orm has special columns and we need to know what database column types should be for those types.

src/driver/sqlite-abstract/AbstractSqliteQueryRunner.ts

@@ -825,17 +825,31 @@ export abstract class AbstractSqliteQueryRunner extends BaseQueryRunner implemen
                     }
                 }
 
-                // parse datatype and attempt to retrieve length
+                // parse datatype and attempt to retrieve length, precision and scale
                 let pos = tableColumn.type.indexOf("(");
                 if (pos !== -1) {
-                    let dataType = tableColumn.type.substr(0, pos);
+                    const fullType = tableColumn.type;
+                    let dataType = fullType.substr(0, pos);
                     if (!!this.driver.withLengthColumnTypes.find(col => col === dataType)) {
-                        let len = parseInt(tableColumn.type.substring(pos + 1, tableColumn.type.length - 1));
+                        let len = parseInt(fullType.substring(pos + 1, fullType.length - 1));
                         if (len) {
                             tableColumn.length = len.toString();
                             tableColumn.type = dataType; // remove the length part from the datatype
                         }
                     }
+                    if (!!this.driver.withPrecisionColumnTypes.find(col => col === dataType)) {
+                        const re = new RegExp(`^${dataType}\\((\\d+),?\\s?(\\d+)?\\)`);
+                        const matches = fullType.match(re);
+                        if (matches && matches[1]) {
+                            tableColumn.precision = +matches[1];
+                        }
+                        if (!!this.driver.withScaleColumnTypes.find(col => col === dataType)) {
+                            if (matches && matches[2]) {
+                                tableColumn.scale = +matches[2];
+                            }
+                        }
+                        tableColumn.type = dataType; // remove the precision/scale part from the datatype
+                    }
                 }
 
                 return tableColumn;

test/github-issues/6636/entity/Test.ts

@@ -0,0 +1,15 @@
+import { Column, Entity, PrimaryColumn } from "../../../../src";
+
+@Entity()
+export class Test {
+
+    @PrimaryColumn()
+    id: number;
+
+    @Column({ nullable: true, precision: 6 })
+    startedAt?: Date;
+
+    @Column({ type: 'decimal', precision: 5, scale: 2 })
+    value: number;
+
+}

test/github-issues/6636/issue-6636.ts

@@ -0,0 +1,25 @@
+import { Connection } from "../../../src";
+import { closeTestingConnections, createTestingConnections, reloadTestingDatabases } from "../../utils/test-utils";
+import { Test } from "./entity/Test";
+import { expect } from "chai";
+
+describe("github issues > #6636 migration issues with scale & precision", () => {
+
+    let connections: Connection[];
+    before(async () => connections = await createTestingConnections({
+        entities: [Test],
+        enabledDrivers: ["sqljs", "sqlite", "better-sqlite3"],
+    }));
+    beforeEach(() => reloadTestingDatabases(connections));
+    after(() => closeTestingConnections(connections));
+
+    it("should not create migrations columns with precision", () => {
+        Promise.all(connections.map(async (connection) => {
+                const sqlInMemory = await connection.driver.createSchemaBuilder().log();
+                expect(sqlInMemory.upQueries).to.eql([]);
+                expect(sqlInMemory.downQueries).to.eql([]);
+            }
+        ))
+    });
+
+});