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本周学习内容

2022-07-24 12:03:08 阅读：90 来源： 互联网

标签：java String 本周学习内容 sql import com public

本周学习内容：

1.目录结构如图：

2.bean包下的类源码
1）字段类 ColumnInfo:

package main.com.oxx.sorm.bean;

/**
* 表中字段的信息
*/
public class ColumnInfo {

/**
* 字段名称
*/
private String name;

/**
* 字段类型
*/
private String dataType;

/**
* 字段键类型 (0,普通键 1.主键 2.外键)
*/
private int keyType;

public ColumnInfo() {
}

public ColumnInfo(String name, String dataType, int keyType) {
this.name = name;
this.dataType = dataType;
this.keyType = keyType;
}

/**在此省略get set 方法**/
}

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2）表信息TableInfo:
1
package main.com.oxx.sorm.bean;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
* 存储表结构信息
*/
public class TableInfo {
/**
* 表名
*/
private String tname;

/**
* 所有字段信息
*/
private Map<String, ColumnInfo> columns;

private ColumnInfo onlyPriKey;

private List<ColumnInfo> listPriKey;

public List<ColumnInfo> getListPriKey() {
return listPriKey;
}

public void setListPriKey(List<ColumnInfo> listPriKey) {
this.listPriKey = listPriKey;
}

public TableInfo() {
}

public TableInfo(String tname, Map<String, ColumnInfo> columns, ColumnInfo onlyPriKey) {
this.tname = tname;
this.columns = columns;
this.onlyPriKey = onlyPriKey;
}

public TableInfo(String tableName, ArrayList<ColumnInfo> columnInfos, HashMap<String, ColumnInfo> columnsMap) {
this.tname = tableName;
this.listPriKey = columnInfos;
this.columns = columnsMap;
}
/**在此省略get set 方法**/
}

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3)配置信息类Configuration:
1
package main.com.oxx.sorm.bean;

/**
* 管理配置信息
*/
public class Configuration {

private String driver;
private String url;
private String user;
private String pwd;
private String usingDB;
private String srcPath;
private String poPackage;
private String queryClass;

/**在此省略get set 方法**/

public Configuration() {

}

public Configuration(String driver, String url, String user, String pwd, String usingDB, String srcPath, String poPackage, String queryClass) {
this.driver = driver;
this.url = url;
this.user = user;
this.pwd = pwd;
this.usingDB = usingDB;
this.srcPath = srcPath;
this.poPackage = poPackage;
this.queryClass = queryClass;
}
}

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4)属性，get,set方法存储类 JavaFieldGetSet：
1
package main.com.oxx.sorm.bean;

public class JavaFieldGetSet {

private String fieldInfo;

private String getInfo;

private String setInfo;

public JavaFieldGetSet() {
}

public JavaFieldGetSet(String fieldInfo, String getInfo, String setInfo) {
this.fieldInfo = fieldInfo;
this.getInfo = getInfo;
this.setInfo = setInfo;
}

/**在此省略get set 方法**/

@Override
public String toString() {
System.out.println(fieldInfo);
System.out.println(getInfo);
System.out.println(setInfo);
return super.toString();
}
}

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2.core包下的核心类：
1）读取配置文件类DBManager:

package main.com.oxx.sorm.core;

import main.com.oxx.sorm.bean.Configuration;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.util.Properties;

/**
* 根据数据库连接维持对象的管理
*/
public class DBManager {

private static Configuration configuration;

static{
Properties prop = new Properties();
try {
prop.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("db.properties"));
} catch (IOException e) {
e.printStackTrace();
}

configuration = new Configuration();
configuration.setDriver(prop.getProperty("driver"));
configuration.setUrl(prop.getProperty("url"));
configuration.setUser(prop.getProperty("user"));
configuration.setPwd((prop.getProperty("pwd")));
configuration.setSrcPath(prop.getProperty("srcPath"));
configuration.setUsingDB(prop.getProperty("usingDB"));
configuration.setPoPackage(prop.getProperty("poPackage"));
configuration.setQueryClass(prop.getProperty("queryClass"));
}

public static Connection getConn(){
try {
Class.forName(configuration.getDriver());
return DriverManager.getConnection(configuration.getUrl(), configuration.getUser(), configuration.getPwd());
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

public static Configuration getConfiguration(){
return configuration;
}
}

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2)生成类文件 TableContext:
1
package main.com.oxx.sorm.core;

import main.com.oxx.sorm.bean.ColumnInfo;
import main.com.oxx.sorm.bean.TableInfo;
import main.com.oxx.sorm.util.StringUtil;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import static main.com.oxx.sorm.util.JavaFileUtils.createJavaPOFile;

/**
* 负责管理数据库表结构与类的关系
*/
public class TableContext {

//表名与表信息
private static Map<String, TableInfo> tables = new HashMap<String, TableInfo>();

//po的class对象与表信息
private static Map<Class, TableInfo> poClassTableMap = new HashMap<Class, TableInfo>();

static{
Connection conn = DBManager.getConn();

try {
DatabaseMetaData databaseMetaData = conn.getMetaData();

ResultSet tableSet = databaseMetaData.getTables(null, "%", "%", new String[]{"TABLE"});

while(tableSet.next()){
String tableName = (String)tableSet.getObject("TABLE_NAME");
TableInfo tableInfo = new TableInfo(tableName, new ArrayList<ColumnInfo>(), new HashMap<String, ColumnInfo>());
tables.put(tableName, tableInfo);

ResultSet columnSet = databaseMetaData.getColumns(null, "%", tableName, "%");
while(columnSet.next()){
ColumnInfo columnInfo = new ColumnInfo(columnSet.getString("COLUMN_NAME"),
columnSet.getString("TYPE_NAME"), 0);
tableInfo.getColumns().put(columnSet.getString("COLUMN_NAME"), columnInfo);
}

ResultSet keySet = databaseMetaData.getPrimaryKeys(null, "%", tableName);
while(keySet.next()){
ColumnInfo columnInfo2 = tableInfo.getColumns().get(keySet.getObject("COLUMN_NAME"));
columnInfo2.setKeyType(1);
tableInfo.getListPriKey().add(columnInfo2);
}

if(tableInfo.getListPriKey().size() > 0){
tableInfo.setOnlyPriKey(tableInfo.getListPriKey().get(0));
}

}
} catch (Exception e) {
e.printStackTrace();
}

//更新po类文件
updateJavaPoFile();
//加载class类
loadPOTable();
}

public static Map<String, TableInfo> getTableInfo(){
return tables;
}

public static void updateJavaPoFile(){
Map<String, TableInfo> tableMap = TableContext.getTableInfo();
for(TableInfo table : tableMap.values()){
createJavaPOFile(table, new MySqlTypeConvertor());
}
}

public static Map<String, TableInfo> getTables() {
return tables;
}

public static void setTables(Map<String, TableInfo> tables) {
TableContext.tables = tables;
}

public static Map<Class, TableInfo> getPoClassTableMap() {
return poClassTableMap;
}

public static void setPoClassTableMap(Map<Class, TableInfo> poClassTableMap) {
TableContext.poClassTableMap = poClassTableMap;
}

public static void loadPOTable(){
for(TableInfo tableInfo : tables.values()){
try {
Class clazz = Class.forName(DBManager.getConfiguration().getPoPackage() + "." +StringUtil.firstChar2UpperCase(tableInfo.getTname()));
poClassTableMap.put(clazz, tableInfo);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
}
}

public class QueryFactory {

private static Query query;

private QueryFactory(){}

static{
try {
Class clazz = Class.forName(DBManager.getConfiguration().getQueryClass());
query = (Query)clazz.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
}

//在此使用模板方法当然也可以使用 newInstance的方式
public static Query createQuery() throws CloneNotSupportedException {
return (Query)query.clone();
}

}

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4）Query抽象类
1
package main.com.oxx.sorm.core;

import main.com.oxx.sorm.bean.ColumnInfo;
import main.com.oxx.sorm.bean.TableInfo;
import main.com.oxx.sorm.util.JDBCUtil;
import main.com.oxx.sorm.util.ReflectUtil;

import java.lang.reflect.Field;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

public abstract class Query implements Cloneable{

public int executeDML(String sql, Object[] params) {

Connection conn = DBManager.getConn();
PreparedStatement ps = null;
int count = 0;
try {
ps = conn.prepareStatement(sql);
JDBCUtil.handleParams(ps, params);
count = ps.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

return count;
}

public void insert(Object obj) {

Class clazz = obj.getClass();
TableInfo tableInfo = TableContext.getPoClassTableMap().get(clazz);

List objList = new ArrayList();
StringBuilder sql = new StringBuilder();

// insert into emp('ename',...) values(ename,...)
sql.append("insert into " + tableInfo.getTname() + " (");
Field[] fields = clazz.getDeclaredFields();
for (Field field : fields) {
try {
field.setAccessible(true);
Object value = field.get(obj);

if (value != null) {
sql.append(field.getName() + ",");
objList.add(value);
}
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
String sqlStr = sql.toString();
sqlStr = sqlStr.substring(0, sqlStr.length() - 1);
sql = new StringBuilder(sqlStr);
sql.append(" ) values(");

for (Object field : objList) {
sql.append("?,");
}
sqlStr = sql.toString();
sqlStr = sqlStr.substring(0, sqlStr.length() - 1) + ");";

System.out.println("==================\n" + sqlStr);
executeDML(sqlStr, objList.toArray());
}

public void delete(Class clazz, Object id) {

Map<Class, TableInfo> stringTableInfoMap = TableContext.getPoClassTableMap();
TableInfo tableInfo = stringTableInfoMap.get(clazz);

//根据主键进行删除
ColumnInfo priKey = tableInfo.getOnlyPriKey();

String sql = "delete from " + tableInfo.getTname() + " where " + priKey.getName() + " = ?";

executeDML(sql, new Object[]{id});
}

public void delete(Object obj) {

Map<Class, TableInfo> classTableInfoMap = TableContext.getPoClassTableMap();
Class clazz = obj.getClass();
TableInfo tableInfo = classTableInfoMap.get(clazz);

Object id = ReflectUtil.invokeGet(tableInfo.getOnlyPriKey().getName(), obj);
delete(clazz, id);

}

public int update(Object obj, String[] fieldNames) {

Class clazz = obj.getClass();
TableInfo tableInfo = TableContext.getPoClassTableMap().get(clazz);
ColumnInfo priKey = tableInfo.getOnlyPriKey();

List paramList = new ArrayList();
StringBuilder sql = new StringBuilder();
sql.append("update " + tableInfo.getTname() + " set ");
for (String field : fieldNames) {
Object value = ReflectUtil.invokeGet(field, obj);
if (value != null) {
sql.append(" " + field + "=?,");
paramList.add(value);
}
}
sql.setCharAt(sql.length() - 1, ' ');

String keyValue = priKey.getName();
Object value = ReflectUtil.invokeGet(keyValue, obj);
if (value != null) {
sql.append(" where " + priKey.getName() + " =?");
paramList.add(value);
}

System.out.println("======================\n" + sql.toString());
return executeDML(sql.toString(), paramList.toArray());
}

public List queryRows(String sql, Class clazz, Object[] params) {

List list = null;
Connection conn = DBManager.getConn();
PreparedStatement ps = null;
ResultSet rs = null;
try {
ps = conn.prepareStatement(sql);
JDBCUtil.handleParams(ps, params);

rs = ps.executeQuery();

while (rs.next()) {
if (list == null) {
list = new ArrayList();
}
Object rowObj = clazz.newInstance();
ResultSetMetaData metaData = rs.getMetaData();
for (int i = 0; i < metaData.getColumnCount(); i++) {
String columnName = metaData.getColumnLabel(i + 1);
Object columnValue = rs.getObject(i + 1);
ReflectUtil.invokeSet(rowObj, columnName, columnValue);
}
list.add(rowObj);
}
} catch (Exception e) {
e.printStackTrace();
} finally {

try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return list;
}

public Object uniqueRow(String sql, Class clazz, Object[] params) {

List list = queryRows(sql, clazz, params);
return list == null || list.size() == 0 ? null : list.get(0);
}

/**
* select count(*) from emp
*
* @param sql
* @param params
* @return
*/

public Object queryValue(String sql, Object[] params) {

Connection conn = DBManager.getConn();
PreparedStatement ps = null;
ResultSet rs = null;
Object value = null;
try {
ps = conn.prepareStatement(sql);
JDBCUtil.handleParams(ps, params);

rs = ps.executeQuery();
while (rs.next()) {
value = rs.getObject(1);
}
} catch (SQLException e) {
e.printStackTrace();
}
return value;
}

public Number queryNumber(String sql, Object[] params) {
return (Number) queryValue(sql, params);
}

public void update(Object obj) {

Class clazz = obj.getClass();
TableInfo tableInfo = TableContext.getPoClassTableMap().get(clazz);
ColumnInfo prikey = tableInfo.getOnlyPriKey();

List paramList = new ArrayList();
StringBuilder sql = new StringBuilder();
sql.append("update " + tableInfo.getTname() + " set ");

Map<String, ColumnInfo> columnMap = tableInfo.getColumns();
Set<String> set = columnMap.keySet();
for (String column : set) {

if (prikey.getName().equals(column)) {
continue;
}
try {
Field field = clazz.getDeclaredField(column);
field.setAccessible(true);
Object value = field.get(obj);

if (value != null) {
sql.append(" " + column + "= ?,");
paramList.add(value);
}

} catch (Exception e) {
e.printStackTrace();
}
}

String sqlStr = sql.toString();
sqlStr = sqlStr.substring(0, sqlStr.length() - 1);

sql = new StringBuilder(sqlStr);
sql.append(" where " + prikey.getName() + "=?");

try {
Field keyField = clazz.getDeclaredField(prikey.getName());
keyField.setAccessible(true);

Object value = keyField.get(obj);
if (value != null) {
paramList.add(value);
}
} catch (Exception e) {
e.printStackTrace();
}

System.out.println("======================\n" + sql);
executeDML(sql.toString(), paramList.toArray());
}

/**
* 以下使用模板方法查询
*/

public abstract List queryMethod(String sql, Class clazz, ResultSet rs);

public List executeQueryTemplateMethod(String sql, Class clazz, Object[] params ){

Connection conn = DBManager.getConn();
PreparedStatement ps = null;
ResultSet rs = null;
try {
ps = conn.prepareStatement(sql);
JDBCUtil.handleParams(ps, params);
rs = ps.executeQuery();
return queryMethod(sql, clazz, rs);
} catch (Exception e) {
e.printStackTrace();
} finally {

/**
* 使用回调
* @param sql
* @param clazz
* @param params
* @param callBack
* @return
*/
public List executeQueryTemplateMethod(String sql, Class clazz, Object[] params, CallBack callBack ){
Connection conn = DBManager.getConn();
PreparedStatement ps = null;
ResultSet rs = null;
try {
ps = conn.prepareStatement(sql);
JDBCUtil.handleParams(ps, params);
rs = ps.executeQuery();
return callBack.doExecute(rs);
} catch (Exception e) {
e.printStackTrace();
} finally {

public abstract List queryRows2(String sql, Class clazz, Object[] params );

@Override
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
}

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5）query实现类：
1
package main.com.oxx.sorm.core;

import main.com.oxx.sorm.util.ReflectUtil;

import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.util.ArrayList;
import java.util.List;

public class MyQuery extends Query {

@Override
public List queryMethod(String sql, Class clazz, ResultSet rs) {
try {
List list = new ArrayList();
while (rs.next()) {
Object rowObj = clazz.newInstance();
ResultSetMetaData metaData = rs.getMetaData();
for (int i = 0; i < metaData.getColumnCount(); i++) {
String columnName = metaData.getColumnLabel(i + 1);
Object columnValue = rs.getObject(i + 1);
ReflectUtil.invokeSet(rowObj, columnName, columnValue);
}
list.add(rowObj);
}
return list;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

@Override
public List queryRows2(String sql, Class clazz, Object[] params) {
return executeQueryTemplateMethod(sql, clazz, params, new CallBack() {
@Override
public List doExecute(ResultSet rs) {
try {
List list = new ArrayList();
while (rs.next()) {
Object rowObj = clazz.newInstance();
ResultSetMetaData metaData = rs.getMetaData();
for (int i = 0; i < metaData.getColumnCount(); i++) {
String columnName = metaData.getColumnLabel(i + 1);
Object columnValue = rs.getObject(i + 1);
ReflectUtil.invokeSet(rowObj, columnName, columnValue);
}
list.add(rowObj);
}
return list;
} catch (Exception e) {
e.printStackTrace();
}
return null;
};
});
}
}

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6）回调接口：
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package main.com.oxx.sorm.core;

import java.sql.ResultSet;
import java.util.List;

public interface CallBack {
List doExecute( ResultSet resultSet);
}

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7）类结构与表映射类：
1
package main.com.oxx.sorm.core;

import main.com.oxx.sorm.bean.ColumnInfo;
import main.com.oxx.sorm.bean.TableInfo;
import main.com.oxx.sorm.util.StringUtil;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import static main.com.oxx.sorm.util.JavaFileUtils.createJavaPOFile;

/**
* 负责管理数据库表结构与类的关系
*/
public class TableContext {

//表名与表信息
private static Map<String, TableInfo> tables = new HashMap<String, TableInfo>();

//po的class对象与表信息
private static Map<Class, TableInfo> poClassTableMap = new HashMap<Class, TableInfo>();

static{
Connection conn = DBManager.getConn();

try {
DatabaseMetaData databaseMetaData = conn.getMetaData();

ResultSet tableSet = databaseMetaData.getTables(null, "%", "%", new String[]{"TABLE"});

if(tableInfo.getListPriKey().size() > 0){
tableInfo.setOnlyPriKey(tableInfo.getListPriKey().get(0));
}

}
} catch (Exception e) {
e.printStackTrace();
}

//更新po类文件
updateJavaPoFile();
//加载class类
loadPOTable();
}

public static Map<String, TableInfo> getTableInfo(){
return tables;
}

public static void updateJavaPoFile(){
Map<String, TableInfo> tableMap = TableContext.getTableInfo();
for(TableInfo table : tableMap.values()){
createJavaPOFile(table, new MySqlTypeConvertor());
}
}

public static Map<String, TableInfo> getTables() {
return tables;
}

public static void setTables(Map<String, TableInfo> tables) {
TableContext.tables = tables;
}

public static Map<Class, TableInfo> getPoClassTableMap() {
return poClassTableMap;
}

public static void setPoClassTableMap(Map<Class, TableInfo> poClassTableMap) {
TableContext.poClassTableMap = poClassTableMap;
}

/**
* 负责java类型与数据库类型转换
*/
public interface TypeConvertor {

/**
* 将数据库类型转化为java数据类型
* @param columnType
* @return
*/
public String databaseType2JavaType(String columnType);

/**
* 将java类型转化为数据库类型
* @param javaType
* @return
*/
public String javaType2DatabaseType(String javaType);
}

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3，util包下的工具类：
1）java类文件生成：

package main.com.oxx.sorm.util;

import main.com.oxx.sorm.bean.ColumnInfo;
import main.com.oxx.sorm.bean.Configuration;
import main.com.oxx.sorm.bean.JavaFieldGetSet;
import main.com.oxx.sorm.bean.TableInfo;
import main.com.oxx.sorm.core.DBManager;
import main.com.oxx.sorm.core.MySqlTypeConvertor;
import main.com.oxx.sorm.core.TableContext;
import main.com.oxx.sorm.core.TypeConvertor;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
* 生成java文件常用操作
*/
public class JavaFileUtils {

public static JavaFieldGetSet createFieldGetSetInfoSrc(ColumnInfo columnInfo, TypeConvertor typeConvertor){
JavaFieldGetSet javaFieldGetSet = new JavaFieldGetSet();

//private int id
String javaFieldType = typeConvertor.databaseType2JavaType(columnInfo.getDataType());
javaFieldGetSet.setFieldInfo("\tprivate" + " " + javaFieldType
+ " " + columnInfo.getName() + ";\n");

//public int getId(){return id}
StringBuilder getSb = new StringBuilder();
getSb.append("\tpublic " + javaFieldType + " " + "get"+StringUtil.firstChar2UpperCase(columnInfo.getName()) + "(){\n");
getSb.append("\t\treturn " + columnInfo.getName() + ";\n");
getSb.append("\t}\n");
javaFieldGetSet.setGetInfo(getSb.toString());

//public void setId(Integer id){this.id = id}
StringBuilder setSb = new StringBuilder();
setSb.append("\tpublic void " + "set"+ StringUtil.firstChar2UpperCase(columnInfo.getName()) + "( ");
setSb.append( javaFieldType +" " + columnInfo.getName() + "){\n");
setSb.append("\t\t this."+columnInfo.getName() + " =" + columnInfo.getName() + ";\n");
setSb.append("\t}\n");

javaFieldGetSet.setSetInfo(setSb.toString());

return javaFieldGetSet;
}

public static String createJavaSrc(TableInfo tableInfo, TypeConvertor typeConvertor){

List<JavaFieldGetSet> javaFieldGetSets = new ArrayList<JavaFieldGetSet>();
Map<String, ColumnInfo> columns = tableInfo.getColumns();
for(ColumnInfo columnInfo : columns.values()){
javaFieldGetSets.add(createFieldGetSetInfoSrc(columnInfo, typeConvertor));
}

StringBuilder javaSrc = new StringBuilder();

//生成包路径
Configuration config = DBManager.getConfiguration();
String srcPackage = config.getPoPackage();
javaSrc.append("package " + srcPackage + "; \n\n");

//生成 import 语句
javaSrc.append("import java.sql.*;\n");
javaSrc.append("import java.util.*; \n\n\n");
//生成类名
javaSrc.append("public class " + StringUtil.firstChar2UpperCase(tableInfo.getTname()) + "{\n\n");
//生成属性 private Integer id;
for(JavaFieldGetSet javaFieldGetSet : javaFieldGetSets){
javaSrc.append(javaFieldGetSet.getFieldInfo() + "\n");
}
javaSrc.append("\n");

//生成getset方法
for(JavaFieldGetSet javaFieldGetSet : javaFieldGetSets){
javaSrc.append(javaFieldGetSet.getGetInfo());
javaSrc.append(javaFieldGetSet.getSetInfo());
}

javaSrc.append("\n}");
return javaSrc.toString();
}

public static void createJavaPOFile(TableInfo table, TypeConvertor typeConvertor){
String src = createJavaSrc(table, typeConvertor);

System.out.println(src);
String srcPath = DBManager.getConfiguration().getSrcPath();
String poPackage = (DBManager.getConfiguration().getPoPackage()).replaceAll("\\.", "\\\\");

String dirPath = srcPath + "/" + poPackage;

File file = new File(dirPath);

if(!file.exists()){
file.mkdirs();
}

String filePath = dirPath + "/" + StringUtil.firstChar2UpperCase(table.getTname()) + ".java";
BufferedWriter bw = null;
try {
bw = new BufferedWriter(new FileWriter(filePath));

bw.write(src);
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
}

}

public static void main(String[] args){
Map<String, TableInfo> tableMap = TableContext.getTableInfo();
for(TableInfo table : tableMap.values()){
createJavaPOFile(table, new MySqlTypeConvertor());
}
}
}

import java.sql.PreparedStatement;
import java.sql.SQLException;

public class JDBCUtil {

public static void handleParams(PreparedStatement ps ,Object[] params){
for(int i = 0; i < params.length; i++){
try {
ps.setObject(i + 1, params[i]);
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}

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3）反射工具类：
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package main.com.oxx.sorm.util;

import java.lang.reflect.Method;

public class ReflectUtil {

public static Object invokeGet(String fieldName, Object obj){

Class clazz = obj.getClass();
try {
Method method = clazz.getDeclaredMethod("get" + StringUtil.firstChar2UpperCase(fieldName));
return method.invoke(obj, null);
} catch (Exception e) {
e.printStackTrace();
}

return null;
}

public static void invokeSet(Object obj, String columnName, Object columnValue){
Method method = null;
try {
if(columnValue != null){
method = obj.getClass().getDeclaredMethod("set"+ StringUtil.firstChar2UpperCase(columnName),
columnValue.getClass());
method.invoke(obj, columnValue);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

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4）字符串工具类：

package main.com.oxx.sorm.util;

public class StringUtil {

public static String firstChar2UpperCase(String str){
return str.toUpperCase().substring(0, 1) + str.substring(1);
}
}

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4.配置文件db.properties：

driver=com.mysql.jdbc.Driver
url=jdbc\:mysql\://localhost\:3306/test
user=root
pwd=root
srcPath=C:\\Users\\Administrator\\IdeaProjects\\mysorm\\src
poPackage=com.oxx.sorm.po
queryClass=main.com.oxx.sorm.core.MyQuery

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5.应用类App:

import com.oxx.sorm.po.Emp;
import main.com.oxx.sorm.core.Query;
import main.com.oxx.sorm.core.QueryFactory;

import java.util.List;

public class App {

public static void main(String[] args) throws CloneNotSupportedException {
Emp emp = new Emp();
emp.setId(112);
emp.setEname("欣淡定");
emp.setEage(113);

String sql = "select * from emp where salary > ?";
Query query = QueryFactory.createQuery();
List list = query.queryRows2(sql, Emp.class, new Object[]{100});
System.out.println(list);

}
}

————————————————
版权声明：本文为CSDN博主「欣淡定」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/xindanding/article/details/111

标签：java,String,本周,学习,内容,sql,import,com,public
来源： https://www.cnblogs.com/lhtlikejava/p/16514224.html

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