标签：
http://www.cnblogs.com/lbangel/p/3487796.html
package cn.test;
import java.io.File;
import java.io.FileOutputStream;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
public class TestAll {
private static String path = "D:\\tool\\project\\DynamicTable\\src\\cn\\test\\entity";
private static String pkname = "com.mysql.jdbc.Driver";
private static String url = "jdbc:mysql://192.168.1.220:3306/Person";
private static String[] classNames = new String[] { "ShipStopping",
"ArriveShip", "TBLUserType" };
private static Map<String, String> fkTableNamesAndPk = new HashMap<String, String>();
public static void main(String[] args) {
test();
}
public static void test() {
Connection conn = null;
DatabaseMetaData metaData = null;
ResultSet rs = null;
ResultSet crs = null;
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
conn = DriverManager.getConnection(url, "admin", "123");
String catalog = conn.getCatalog(); // catalog 其实也就是数据库名
metaData = conn.getMetaData();
File dirFile = new File(path);
if (!dirFile.exists()) {
dirFile.mkdirs();
}
// 获取表
rs = metaData.getTables(null, "%", "%", new String[] { "TABLE" });
while (rs.next()) {
String tablename = rs.getString("TABLE_NAME");
String classname = getClassNameByTableName(tablename);
StringBuffer sb = new StringBuffer();
StringBuffer sbpackage = new StringBuffer();
sbpackage.append("package cn.test.entity;\r\n\r\n");
sbpackage.append("import javax.persistence.Column;\r\n");
sbpackage.append("import javax.persistence.Entity;\r\n");
sbpackage.append("import javax.persistence.GeneratedValue;\r\n");
sbpackage.append("import javax.persistence.Id;\r\n");
sbpackage.append("import javax.persistence.Table;\r\n\r\n");
sb.append("\r\n@Entity\r\n");
sb.append("@Table(name = \"" + tablename + "\")\r\n");
sb.append("public class " + classname
+ " implements java.io.Serializable {\r\n");
// 获取当前表的列
crs = metaData.getColumns(null, "%", tablename, "%");
// 获取被引用的表，它的主键就是当前表的外键
fkTableNamesAndPk.clear();
ResultSet foreignKeyResultSet = metaData.getImportedKeys(catalog, null, tablename);
while (foreignKeyResultSet.next()) {
String pkTablenName = foreignKeyResultSet.getString("PKTABLE_NAME"); // 外键表
String fkColumnName = foreignKeyResultSet.getString("FKCOLUMN_NAME"); // 外键
if (!fkTableNamesAndPk.containsKey(fkColumnName))
fkTableNamesAndPk.put(fkColumnName, pkTablenName);
}
// foreignKeyResultSet.close();
while (crs.next()) {
String columnname = crs.getString("COLUMN_NAME");
String columntype = crs.getString("TYPE_NAME");
System.out.println("--------------------------"+ columntype);
if (existFKColumn(columnname)) {
String fkclassname = getClassNameByTableName(fkTableNamesAndPk.get(columnname));
sbpackage.append("import " + pkname + "." + fkclassname+ ";\r\n");
sb.append("\t/** */\r\n");
sb.append("\tprivate " + fkclassname + " " + columnname+ ";\r\n");
} else {
sb.append("\t/** */\r\n");
sb.append("\tprivate "+ getFieldType(columntype, sbpackage) + " "+ columnname + ";\r\n");
}
}
sb.append("}");
File file = new File(dirFile, classname + ".java");
if (file.exists()) {
file.delete();
}
getTitle(sbpackage, classname);
FileOutputStream outputStream = new FileOutputStream(file);
outputStream.write(sbpackage.toString().getBytes());
outputStream.write(sb.toString().getBytes());
outputStream.close();
System.out.println(classname + " create success ... ");
}
} catch (Exception e) {
e.printStackTrace(System.out);
} finally {
try {
if (null != rs) {
rs.close();
}
if (null != conn) {
conn.close();
}
} catch (Exception e2) {
}
}
}
/**
* 根据表名获取类名称
*
* @param tablename
* @return
*/
private static String getClassNameByTableName(String tablename) {
String classname = getClassName(tablename);
for (String name : classNames) {
if (name.toLowerCase().equals(tablename.toLowerCase())) {
classname = name;
}
}
return classname;
}
private static boolean existFKColumn(String columnname) {
if (fkTableNamesAndPk != null) {
if (fkTableNamesAndPk.containsKey(columnname))
return true;
}
return false;
}
/**
* 适合表名为单个单词， 例如：表名是TBLUSER 类名是TBLUser;当表名是USER 类名是User;当表面是USERTYPE(两个单词)
* 时，类名是Usertype,如果要 UserType，将期望的类名添加到classNames字段中（与数据库表名一致 不区分大小写）。
*
* @param tablename
* @return
*/
public static String getClassName(String tablename) {
String res = tablename.toLowerCase();
if (tablename.startsWith("TBL")) {
return tablename.substring(0, 4) + res.substring(4);
}
return tablename.substring(0, 1).toUpperCase() + res.substring(1);
}
/**
* 设置字段类型 MySql数据类型
*
* @param columnType
* 列类型字符串
* @param sbpackage
* 封装包信息
* @return
*/
public static String getFieldType(String columnType, StringBuffer sbpackage) {
/*
* tinyblob tinyblob byte[]
tinytext varchar java.lang.string
blob blob byte[]
text varchar java.lang.string
mediumblob mediumblob byte[]
mediumtext varchar java.lang.string
longblob longblob byte[]
longtext varchar java.lang.string
enum(‘value1‘,‘value2‘,...) char java.lang.string
set(‘value1‘,‘value2‘,...) char java.lang.string
*/
columnType = columnType.toLowerCase();
if (columnType.equals("varchar") || columnType.equals("nvarchar")
|| columnType.equals("char")
// || columnType.equals("tinytext")
// || columnType.equals("text")
// || columnType.equals("mediumtext")
// || columnType.equals("longtext")
) {
return "String";
} else if (columnType.equals("tinyblob")
||columnType.equals("blob")
||columnType.equals("mediumblob")
||columnType.equals("longblob")) {
return "byte[]1111";
} else if (columnType.equals("datetime")
||columnType.equals("date")
||columnType.equals("timestamp")
||columnType.equals("time")
||columnType.equals("year")) {
sbpackage.append("import java.util.Date;\r\n");
return "Date";
} else if (columnType.equals("bit")
||columnType.equals("int")
||columnType.equals("tinyint")
||columnType.equals("smallint")
// ||columnType.equals("bool")
// ||columnType.equals("mediumint")
// ||columnType.equals("bigint")
) {
return "int";
} else if (columnType.equals("float")) {
return "Float";
} else if (columnType.equals("double")) {
return "Double";
} else if (columnType.equals("decimal")) {
// sbpackage.append("import java.math.BigDecimal;\r\n");
// return "BigDecimal";
}
return "ErrorType";
}
/**
* 设置类标题注释
*
* @param sbpackage
* @param className
*/
public static void getTitle(StringBuffer sbpackage, String className) {
SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日");
sbpackage.append("\r\n/**\r\n");
sbpackage.append("*\r\n");
sbpackage.append("* 标题: " + className + "<br/>\r\n");
sbpackage.append("* 说明: <br/>\r\n");
sbpackage.append("*\r\n");
sbpackage.append("* 作成信息: DATE: " + format.format(new Date())
+ " NAME: author\r\n");
sbpackage.append("*\r\n");
sbpackage.append("* 修改信息<br/>\r\n");
sbpackage.append("* 修改日期 修改者 修改ID 修改内容<br/>\r\n");
sbpackage.append("*\r\n");
sbpackage.append("*/\r\n");
}
}
通过jdbc获取数据库中的表结构 主键 各个表字段类型及应用生成实体类
标签：
原文地址：http://www.cnblogs.com/fx2008/p/5407371.html
