mysql 提取 schema,table,column names

参考：

https://dzone.com/articles/how-use-linkedin-market-your

表空间信息

https://coderanch.com/t/300498/databases/Java-find-List-tablespaces-database

getCatalogs()

存储过程

https://dev.mysql.com/doc/refman/5.7/en/routines-table.html

注释

https://dev.mysql.com/doc/refman/8.0/en/columns-table.html

外键

https://dev.mysql.com/doc/refman/5.5/en/constraint-foreign-key.html

 package com.dataconnect.test.util;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SchemaDetailsTest {
   private static Logger log = LoggerFactory
       .getLogger(SchemaDetailsTest.class);
   public static void main(String args[]) throws Exception {
     String databaseName = "myDbName";
     String userName = "username";
     String password = "password";
     String mySQLPort = "3306";
     String hostUrl = "127.0.0.1";
     // Setup the connection with the DB
     Class.forName("com.mysql.jdbc.Driver");
     Connection conn = DriverManager.getConnection("jdbc:mysql://" + hostUrl
         + ":" + mySQLPort, userName, password);
     // --- LISTING DATABASE SCHEMA NAMES ---
     ResultSet resultSet = conn.getMetaData().getCatalogs();
     while (resultSet.next()) {
       log.info("Schema Name = " + resultSet.getString("TABLE_CAT"));
     }
     resultSet.close();
     // --- LISTING DATABASE TABLE NAMES ---
     String[] types = { "TABLE" };
     resultSet = conn.getMetaData()
         .getTables(databaseName, null, "%", types);
     String tableName = "";
     while (resultSet.next()) {
       tableName = resultSet.getString(3);
       log.info("Table Name = " + tableName);
     }
     resultSet.close();
     // --- LISTING DATABASE COLUMN NAMES ---
     DatabaseMetaData meta = conn.getMetaData();
     resultSet = meta.getColumns(databaseName, null, tableName, "%");
     while (resultSet.next()) {
       log.info("Column Name of table " + tableName + " = "
           + resultSet.getString(4));
     }
   }
}