init - add project files
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118
tools/jet-2.12.0/generator/mysql/mysql_generator.go
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118
tools/jet-2.12.0/generator/mysql/mysql_generator.go
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package mysql
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import (
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"database/sql"
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"errors"
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"fmt"
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"strings"
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"github.com/go-jet/jet/v2/generator/metadata"
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"github.com/go-jet/jet/v2/generator/template"
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"github.com/go-jet/jet/v2/mysql"
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mysqldr "github.com/go-sql-driver/mysql"
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)
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const mysqlMaxConns = 10
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// DBConnection contains MySQL connection details
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type DBConnection struct {
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Host string
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Port int
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User string
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Password string
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Params string
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DBName string
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}
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// Generate generates jet files at destination dir from database connection details
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func Generate(destDir string, dbConn DBConnection, generatorTemplate ...template.Template) error {
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connectionString := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s", dbConn.User, dbConn.Password, dbConn.Host, dbConn.Port, dbConn.DBName)
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if dbConn.Params != "" {
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connectionString += "?" + dbConn.Params
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}
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db, err := openConnection(connectionString)
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if err != nil {
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return fmt.Errorf("failed to open db connection: %w", err)
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}
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defer db.Close()
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err = generate(db, dbConn.DBName, destDir, generatorTemplate...)
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if err != nil {
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return err
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}
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return nil
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}
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// GenerateDSN opens connection via DSN string and does everything what Generate does.
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func GenerateDSN(dsn, destDir string, templates ...template.Template) error {
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// Special case for go mysql driver. It does not understand schema,
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// so we need to trim it before passing to generator
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// https://github.com/go-sql-driver/mysql#dsn-data-source-name
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idx := strings.Index(dsn, "://")
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if idx != -1 {
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dsn = dsn[idx+len("://"):]
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}
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cfg, err := mysqldr.ParseDSN(dsn)
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if err != nil {
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return fmt.Errorf("failed to parse DSN: %w", err)
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}
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if cfg.DBName == "" {
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return errors.New("database name is required")
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}
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db, err := openConnection(dsn)
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if err != nil {
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return fmt.Errorf("failed to open db connection: %w", err)
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}
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defer db.Close()
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err = generate(db, cfg.DBName, destDir, templates...)
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if err != nil {
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return fmt.Errorf("failed to generate: %w", err)
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}
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return nil
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}
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func openConnection(connectionString string) (*sql.DB, error) {
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fmt.Println("Connecting to MySQL database...")
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db, err := sql.Open("mysql", connectionString)
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if err != nil {
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return nil, fmt.Errorf("failed to open mysql connection: %w", err)
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}
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db.SetMaxOpenConns(mysqlMaxConns)
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db.SetMaxIdleConns(mysqlMaxConns)
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err = db.Ping()
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if err != nil {
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return nil, fmt.Errorf("failed to ping database: %w", err)
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}
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return db, nil
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}
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func generate(db *sql.DB, dbName, destDir string, templates ...template.Template) error {
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fmt.Println("Retrieving database information...")
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// No schemas in MySQL
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schemaMetaData, err := metadata.GetSchema(db, &mySqlQuerySet{}, dbName)
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if err != nil {
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return fmt.Errorf("failed to get '%s' database metadata: %w", dbName, err)
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}
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genTemplate := template.Default(mysql.Dialect)
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if len(templates) > 0 {
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genTemplate = templates[0]
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}
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err = template.ProcessSchema(destDir, schemaMetaData, genTemplate)
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if err != nil {
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return fmt.Errorf("failed to process '%s' database: %w", schemaMetaData.Name, err)
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}
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return nil
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}
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91
tools/jet-2.12.0/generator/mysql/query_set.go
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91
tools/jet-2.12.0/generator/mysql/query_set.go
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@@ -0,0 +1,91 @@
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package mysql
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import (
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"context"
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"database/sql"
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"fmt"
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"strings"
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"github.com/go-jet/jet/v2/generator/metadata"
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"github.com/go-jet/jet/v2/qrm"
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)
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// mySqlQuerySet is dialect query set for MySQL
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type mySqlQuerySet struct{}
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func (m mySqlQuerySet) GetTablesMetaData(db *sql.DB, schemaName string, tableType metadata.TableType) ([]metadata.Table, error) {
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query := `
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SELECT
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t.table_name as "table.name",
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col.COLUMN_NAME AS "column.Name",
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col.COLUMN_DEFAULT IS NOT NULL as "column.HasDefault",
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col.IS_NULLABLE = "YES" AS "column.IsNullable",
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col.COLUMN_COMMENT AS "column.Comment",
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COALESCE(pk.IsPrimaryKey, 0) AS "column.IsPrimaryKey",
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IF (col.COLUMN_TYPE = 'tinyint(1)',
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'boolean',
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IF (col.DATA_TYPE = 'enum',
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CONCAT(col.TABLE_NAME, '_', col.COLUMN_NAME),
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col.DATA_TYPE)
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) AS "dataType.Name",
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IF (col.DATA_TYPE = 'enum', 'enum', 'base') AS "dataType.Kind",
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col.COLUMN_TYPE LIKE '%unsigned%' AS "dataType.IsUnsigned"
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FROM INFORMATION_SCHEMA.tables AS t
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INNER JOIN
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information_schema.columns AS col
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ON t.table_schema = col.table_schema AND t.table_name = col.table_name
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LEFT JOIN (
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SELECT k.column_name, 1 AS IsPrimaryKey, k.table_name
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FROM information_schema.table_constraints t
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JOIN information_schema.key_column_usage k USING(constraint_name, table_schema, table_name)
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WHERE t.table_schema = ?
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AND t.constraint_type = 'PRIMARY KEY'
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) AS pk ON col.COLUMN_NAME = pk.column_name AND col.table_name = pk.table_name
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WHERE t.table_schema = ?
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AND t.table_type = ?
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ORDER BY
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t.table_name,
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col.ordinal_position;
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`
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var tables []metadata.Table
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_, err := qrm.Query(context.Background(), db, query, []interface{}{schemaName, schemaName, tableType}, &tables)
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if err != nil {
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return nil, fmt.Errorf("failed to query column meta data: %w", err)
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}
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return tables, nil
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}
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func (m mySqlQuerySet) GetEnumsMetaData(db *sql.DB, schemaName string) ([]metadata.Enum, error) {
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query := `
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SELECT (CASE c.DATA_TYPE WHEN 'enum' then CONCAT(c.TABLE_NAME, '_', c.COLUMN_NAME) ELSE '' END ) as "name",
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SUBSTRING(c.COLUMN_TYPE,5) as "values"
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FROM information_schema.columns as c
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INNER JOIN information_schema.tables as t on (t.table_schema = c.table_schema AND t.table_name = c.table_name)
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WHERE c.table_schema = ? AND DATA_TYPE = 'enum';
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`
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var queryResult []struct {
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Name string
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Values string
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}
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_, err := qrm.Query(context.Background(), db, query, []interface{}{schemaName}, &queryResult)
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if err != nil {
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return nil, fmt.Errorf("failed to query enums meta data: %w", err)
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}
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var ret []metadata.Enum
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for _, result := range queryResult {
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enumValues := strings.Replace(result.Values[1:len(result.Values)-1], "'", "", -1)
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ret = append(ret, metadata.Enum{
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Name: result.Name,
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Values: strings.Split(enumValues, ","),
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})
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}
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return ret, nil
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}
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