feat(er-diagram): infer relationship cardinality and export schema to SQL (#1335) #1759
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| import Foundation | ||
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|
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| enum ERDiagramSQLExporter { | ||
| static func generate( | ||
| tableNames: [String], | ||
| allColumns: [String: [ColumnInfo]], | ||
| allForeignKeys: [String: [ForeignKeyInfo]], | ||
| isSQLite: Bool, | ||
| quoteIdentifier: (String) -> String | ||
| ) -> String { | ||
| let orderedTables = tableNames.sorted() | ||
| let exportedTables = Set(orderedTables) | ||
|
|
||
| var statements: [String] = [] | ||
|
|
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| for tableName in orderedTables { | ||
| guard let columns = allColumns[tableName], !columns.isEmpty else { continue } | ||
| let inlineForeignKeys = isSQLite | ||
| ? (allForeignKeys[tableName] ?? []).filter { exportedTables.contains($0.referencedTable) } | ||
| : [] | ||
| statements.append(createTableStatement( | ||
| tableName: tableName, | ||
| columns: columns, | ||
| inlineForeignKeys: inlineForeignKeys, | ||
| quoteIdentifier: quoteIdentifier | ||
| )) | ||
| } | ||
|
|
||
| if !isSQLite { | ||
| for tableName in orderedTables { | ||
| guard allColumns[tableName]?.isEmpty == false else { continue } | ||
| let foreignKeys = (allForeignKeys[tableName] ?? []).filter { exportedTables.contains($0.referencedTable) } | ||
| for group in groupByConstraintName(foreignKeys) { | ||
| statements.append(alterTableForeignKeyStatement( | ||
| tableName: tableName, | ||
| group: group, | ||
| quoteIdentifier: quoteIdentifier | ||
| )) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return statements.joined(separator: "\n\n") | ||
| } | ||
|
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| private static func createTableStatement( | ||
| tableName: String, | ||
| columns: [ColumnInfo], | ||
| inlineForeignKeys: [ForeignKeyInfo], | ||
| quoteIdentifier: (String) -> String | ||
| ) -> String { | ||
| let primaryKeyColumns = columns.filter(\.isPrimaryKey).map(\.name) | ||
| let singleColumnPrimaryKey = primaryKeyColumns.count == 1 ? primaryKeyColumns.first : nil | ||
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| var lines = columns.map { column in | ||
| columnDefinition( | ||
| column: column, | ||
| inlinePrimaryKey: column.name == singleColumnPrimaryKey, | ||
| quoteIdentifier: quoteIdentifier | ||
| ) | ||
| } | ||
|
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| if primaryKeyColumns.count > 1 { | ||
| let cols = primaryKeyColumns.map(quoteIdentifier).joined(separator: ", ") | ||
| lines.append("PRIMARY KEY (\(cols))") | ||
|
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When a foreign key references a natural key or other unique non-primary column, this exporter creates the parent table without any Useful? React with 👍 / 👎. |
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| } | ||
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| for group in groupByConstraintName(inlineForeignKeys) { | ||
| lines.append(inlineForeignKeyClause(group: group, quoteIdentifier: quoteIdentifier)) | ||
| } | ||
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| let body = lines.map { " \($0)" }.joined(separator: ",\n") | ||
| return "CREATE TABLE \(quoteIdentifier(tableName)) (\n\(body)\n);" | ||
| } | ||
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| private static func columnDefinition( | ||
| column: ColumnInfo, | ||
| inlinePrimaryKey: Bool, | ||
| quoteIdentifier: (String) -> String | ||
| ) -> String { | ||
| var definition = "\(quoteIdentifier(column.name)) \(column.dataType)" | ||
|
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When exporting a table whose generated key is represented in metadata, such as MySQL Useful? React with 👍 / 👎. |
||
| if !column.isNullable { | ||
| definition += " NOT NULL" | ||
| } | ||
| if let defaultValue = column.defaultValue, !defaultValue.isEmpty { | ||
| definition += " DEFAULT \(formatDefaultValue(defaultValue))" | ||
| } | ||
| if inlinePrimaryKey { | ||
| definition += " PRIMARY KEY" | ||
| } | ||
| return definition | ||
| } | ||
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| private static func formatDefaultValue(_ value: String) -> String { | ||
| let trimmed = value.trimmingCharacters(in: .whitespaces) | ||
| let passthroughKeywords: Set<String> = [ | ||
| "NULL", "TRUE", "FALSE", | ||
| "CURRENT_TIMESTAMP", "CURRENT_TIMESTAMP()", | ||
| "CURRENT_DATE", "CURRENT_TIME", "NOW()", "LOCALTIMESTAMP" | ||
| ] | ||
| if passthroughKeywords.contains(trimmed.uppercased()) { return trimmed } | ||
| if trimmed.hasPrefix("'") { return trimmed } | ||
| if trimmed.contains("(") || trimmed.contains("::") { return trimmed } | ||
| if Int64(trimmed) != nil { return trimmed } | ||
| if let number = Double(trimmed), number.isFinite { return trimmed } | ||
| let escaped = trimmed.replacingOccurrences(of: "'", with: "''") | ||
| return "'\(escaped)'" | ||
| } | ||
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| private static func inlineForeignKeyClause( | ||
| group: [ForeignKeyInfo], | ||
| quoteIdentifier: (String) -> String | ||
| ) -> String { | ||
| let cols = group.map { quoteIdentifier($0.column) }.joined(separator: ", ") | ||
| let refCols = group.map { quoteIdentifier($0.referencedColumn) }.joined(separator: ", ") | ||
| let refTable = quoteIdentifier(group[0].referencedTable) | ||
| var clause = "FOREIGN KEY (\(cols)) REFERENCES \(refTable) (\(refCols))" | ||
| clause += referentialActions(group[0]) | ||
| return clause | ||
| } | ||
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| private static func alterTableForeignKeyStatement( | ||
| tableName: String, | ||
| group: [ForeignKeyInfo], | ||
| quoteIdentifier: (String) -> String | ||
| ) -> String { | ||
| let cols = group.map { quoteIdentifier($0.column) }.joined(separator: ", ") | ||
| let refCols = group.map { quoteIdentifier($0.referencedColumn) }.joined(separator: ", ") | ||
|
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For SQL Server composite foreign keys, Useful? React with 👍 / 👎. |
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| let refTable = quoteIdentifier(group[0].referencedTable) | ||
| let constraintName = quoteIdentifier(group[0].name) | ||
| var statement = "ALTER TABLE \(quoteIdentifier(tableName)) ADD CONSTRAINT \(constraintName)" | ||
| statement += " FOREIGN KEY (\(cols)) REFERENCES \(refTable) (\(refCols))" | ||
| statement += referentialActions(group[0]) | ||
| return statement + ";" | ||
| } | ||
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| private static func referentialActions(_ foreignKey: ForeignKeyInfo) -> String { | ||
| var actions = "" | ||
| let onDelete = foreignKey.onDelete.uppercased() | ||
| let onUpdate = foreignKey.onUpdate.uppercased() | ||
| if onDelete != "NO ACTION" { actions += " ON DELETE \(onDelete)" } | ||
| if onUpdate != "NO ACTION" { actions += " ON UPDATE \(onUpdate)" } | ||
| return actions | ||
| } | ||
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| private static func groupByConstraintName(_ foreignKeys: [ForeignKeyInfo]) -> [[ForeignKeyInfo]] { | ||
| var orderedNames: [String] = [] | ||
| var groups: [String: [ForeignKeyInfo]] = [:] | ||
| for foreignKey in foreignKeys { | ||
| if groups[foreignKey.name] == nil { | ||
| orderedNames.append(foreignKey.name) | ||
| } | ||
| groups[foreignKey.name, default: []].append(foreignKey) | ||
| } | ||
| return orderedNames.compactMap { groups[$0] } | ||
| } | ||
| } | ||
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When a composite primary key contains more than two FK columns but only two distinct referenced tables, such as
buyer_idandseller_idboth referencingusersplusproduct_idreferencingproducts, this still classifies the table as a junction. The default collapsed view then hides the real table and its edges and replaces the ternary association with a single users-products many-to-many edge, so require exactly two PK FK columns or otherwise skip non-binary associations.Useful? React with 👍 / 👎.