import io.dropwizard.db.DatabaseConfiguration; //导入依赖的package包/类
public DbCommand(final String name, final DatabaseConfiguration<T> databaseConfiguration,
                 final FlywayConfiguration<T> flywayConfiguration,
                 final Class<T> configurationClass) {
    super(name, "Run database migration tasks",
            databaseConfiguration, flywayConfiguration, configurationClass);

    addSubCommand(new DbMigrateCommand<>(databaseConfiguration, flywayConfiguration, configurationClass));
    addSubCommand(new DbCleanCommand<>(databaseConfiguration, flywayConfiguration, configurationClass));
    addSubCommand(new DbInitCommand<>(databaseConfiguration, flywayConfiguration, configurationClass));
    addSubCommand(new DbValidateCommand<>(databaseConfiguration, flywayConfiguration, configurationClass));
    addSubCommand(new DbInfoCommand<>(databaseConfiguration, flywayConfiguration, configurationClass));
    addSubCommand(new DbRepairCommand<>(databaseConfiguration, flywayConfiguration, configurationClass));
}
 

import io.dropwizard.db.DatabaseConfiguration; //导入依赖的package包/类
AbstractFlywayCommand(final String name,
                      final String description,
                      final DatabaseConfiguration<T> databaseConfiguration,
                      final FlywayConfiguration<T> flywayConfiguration,
                      final Class<T> configurationClass) {
    super(name, description);
    this.databaseConfiguration = databaseConfiguration;
    this.flywayConfiguration = flywayConfiguration;
    this.configurationClass = configurationClass;
}
 

import io.dropwizard.db.DatabaseConfiguration; //导入依赖的package包/类
public DbValidateCommand(final DatabaseConfiguration<T> databaseConfiguration,
                         final FlywayConfiguration<T> flywayConfiguration,
                         final Class<T> configurationClass) {
    super("validate", "Validates the applied migrations against the ones available on the classpath.",
            databaseConfiguration, flywayConfiguration, configurationClass);
}
 

import io.dropwizard.db.DatabaseConfiguration; //导入依赖的package包/类
public DbRepairCommand(final DatabaseConfiguration<T> databaseConfiguration,
                       final FlywayConfiguration<T> flywayConfiguration,
                       final Class<T> configurationClass) {
    super("repair", "Repairs the metadata table.",
            databaseConfiguration, flywayConfiguration, configurationClass);
}
 

import io.dropwizard.db.DatabaseConfiguration; //导入依赖的package包/类
public DbInitCommand(final DatabaseConfiguration<T> databaseConfiguration,
                     final FlywayConfiguration<T> flywayConfiguration,
                     final Class<T> configurationClass) {
    super("init", "Creates and initializes the metadata table (existing database).",
            databaseConfiguration, flywayConfiguration, configurationClass);
}
 

import io.dropwizard.db.DatabaseConfiguration; //导入依赖的package包/类
public DbInfoCommand(final DatabaseConfiguration<T> databaseConfiguration,
                     final FlywayConfiguration<T> flywayConfiguration,
                     final Class<T> configurationClass) {
    super("info", "Prints the details and status information about all the migrations.",
            databaseConfiguration, flywayConfiguration, configurationClass);
}
 

import io.dropwizard.db.DatabaseConfiguration; //导入依赖的package包/类
public DbCleanCommand(final DatabaseConfiguration<T> databaseConfiguration,
                      final FlywayConfiguration<T> flywayConfiguration,
                      final Class<T> configurationClass) {
    super("clean", "Drops all objects in the configured schemas.",
            databaseConfiguration, flywayConfiguration, configurationClass);
}
 

import io.dropwizard.db.DatabaseConfiguration; //导入依赖的package包/类
public DbMigrateCommand(final DatabaseConfiguration<T> databaseConfiguration,
                        final FlywayConfiguration<T> flywayConfiguration,
                        final Class<T> configurationClass) {
    super("migrate", "Migrates the database.",
            databaseConfiguration, flywayConfiguration, configurationClass);
}