使用 JDBC 在 MySQL 中创建包含所有数据类型的表的示例?
jdbcobject oriented programmingprogramming
Java 提供支持类/数据类型来存储所有 MySQL 数据类型，下表列出了 MySQL 数据类型的相应 Java 类型 −
| MySQL 类型 | Java类型 |
|---|---|
| CHAR | 字符串 |
| VARCHAR | 字符串 |
| LONGVARCHAR | 字符串 |
| NUMERIC | java.math.BigDecimal |
| DECIMAL | java.math.BigDecimal |
| BIT | 布尔值 |
| TINYINT | 字节 |
| SMALLINT | 短整型 |
| INTEGER | 整数 |
| BIGINT | 长整型 |
| REAL | 浮点型 |
| FLOAT | 双精度型 |
| DOUBLE | 双精度型 |
| 二进制 | 字节[] |
| VARBINARY | byte [] |
| LONGVARBINARY | byte [] |
| DATE | java.sql.Date |
| TIME | java.sql.Time |
| TIMESTAMP | java.sql.Tiimestamp |
示例
以下 JDBC 程序创建一个名为 sample 的表，其中包含 MySQL 中所有可能的数据类型 −
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
public class CreatingTable_AllDatatypes {
public static void main(String args[])throws Exception {
//注册驱动程序
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//获取连接
String mysqlUrl = "jdbc:mysql://localhost/sampledatabase";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("连接已建立......");
//创建 Statement 对象
Statement stmt = con.createStatement();
//查询以创建具有所有受支持数据类型的表
String query = "CREATE table sample_table ("
+ "varchar_column VARCHAR( 20 ), "
+ "tinyint_column TINYINT, "
+ "text_column TEXT, "
+ "date_column DATE, "
+ "smallint_column SMALLINT, "
+ "mediumint_column MEDIUMINT, "
+ "int_column INT, "
+ "bigint_column BIGINT, "
+ "float_column FLOAT( 10, 2 ), "
+ "double_column DOUBLE, "
+ "decimal_column DECIMAL( 10, 2 ), "
+ "datetime_column DATETIME, "
+ "timestamp_column TIMESTAMP, "
+ "time_column TIME, "
+ "year_column YEAR, "
+ "char_column CHAR( 10 ), "
+ "tinyblob_column TINYBLOB, "
+ "tinytext_column TINYTEXT, "
+ "blob_column BLOB, "
+ "mediumblob_column MEDIUMBLOB, "
+ "mediumtext_column MEDIUMTEXT, "
+ "longblob_column LONGBLOB, "
+ "longtext_column LONGTEXT, "
+ "enum_column ENUM( '1', '2', '3' ), "
+ "set_column SET( '1', '2', '3' ), "
+ "bool_column BOOL, "
+ "binary_column BINARY( 20 ), "
+ "varbinary_column VARBINARY( 20 )"
+ ")";
//执行查询
stmt.execute(query);
System.out.println("Table created ........");
}
}
输出
Connection established...... Table created ........
