JDBC Opret tabel Eksempel Brugserklæring

Denne artikel indeholder et java-eksempel på, hvordan du bruger java.sql. Statement for at udføre oprette MySQL-tabel SQL-scripts.

1. JDBC Statement Code Snippets

1. Kildekoden nedenfor for java-uddrag viser, hvordan du opretter java.sql.Connection objekt og opret java.sql. Statement  objekt og kør et SQL-script gennem java.sql.Statement  objekt.

   /* Get mysql connection object.*/
   java.sql.Connection conn = this.getMySqlConnection(ip, port, dbName, userName, password);
   if(conn!=null)
   {
   	/* Create Statement object. */
           java.sql.Statement stmt = conn.createStatement();
   				
   	/* Execute create table sql command. */
   	stmt.execute(createTableSql);
   }
   

2. Fuldfør Java-kode

1. StatementCreateTableExample.java

   public class StatementCreateTableExample {
   
   	public static void main(String[] args) {
   		
   		StatementCreateTableExample scte = new StatementCreateTableExample();
   		
   		/* This is the sql command to create mysql table. */
   		String createMySqlTableSql = "CREATE TABLE `test`.`teacher` ( `name` VARCHAR(100) NOT NULL , `email` VARCHAR(100) NOT NULL ) ENGINE = InnoDB; ";
   	
   		
   		scte.createMySQLTable("localhost", 3306, "test", "root", "", createMySqlTableSql);
   	}
   	
   	/* This method return java.sql.Connection object from MySQL server. */
   	public Connection getMySqlConnection(String ip, int port, String dbName, String userName, String password)
   	{
   		/* Declare and initialize a sql Connection variable. */
   		Connection ret = null;
   		
   		try
   		{
   		
   			/* Register for mysql jdbc driver class. */
   			Class.forName("com.mysql.jdbc.Driver");
   			
   			/* Create mysql connection url. */
   			String mysqlConnUrl = "jdbc:mysql://" + ip + ":" + port + "/" + dbName;
   			
   			/* Get the mysql Connection object. */
   			ret = DriverManager.getConnection(mysqlConnUrl, userName , password);
   		}catch(Exception ex)
   		{
   			ex.printStackTrace();
   		}finally
   		{
   			return ret;
   		}
   	}
   	
   	public void createMySQLTable(String ip, int port, String dbName, String userName, String password, String createTableSql)
   	{
   		Connection conn = null;
   		Statement stmt = null;
   		try
   		{
   			/* Get mysql connection object.*/
   			conn = this.getMySqlConnection(ip, port, dbName, userName, password);
   			if(conn!=null)
   			{
   				/* Create Statement object. */
   				stmt = conn.createStatement();
   				
   				/* Execute create table sql command. */
   				stmt.execute(createTableSql);
   			}
   			
   		}catch(Exception ex)
   		{
   			ex.printStackTrace();
   		}finally
   		{
   			/* Release statment and connection object. This can save system resources. */
   			try
   			{
   				if(stmt!=null)
   				{
   					stmt.close();
   					stmt = null;
   				}
   				
   				if(conn!=null)
   				{
   					conn.close();
   					conn = null;
   				}
   				
   			}catch(Exception ex)
   			{
   				ex.printStackTrace();
   			}
   		}
   	}
   
   }
   

3. Udførelsesresultat.

1. Når kodeudførelsen er færdig, kan du se, at tabellen lærer er blevet oprettet under MySQL testdatabasen.
2. Du kan læse artiklen Sådan bruges JDBC til at forbinde MySql-database for at lære mere om MySQL JDBC-drift.