通过java8修改代码

panda-jdbc/src/main/java/org/panda/jdbc/sql/builder/MysqlBuilder.java

@@ -11,6 +11,7 @@ import org.slf4j.LoggerFactory;
 
 import java.lang.reflect.Field;
 import java.util.*;
+import java.util.stream.Collectors;
 
 /**
  * @author qi
@@ -35,26 +36,19 @@ public class MysqlBuilder extends AbstractDbBuiler {
     public String automaticUpdateDb(Set<Class> classSet,List<Table> tableList) {
         StringBuffer sql = new StringBuffer();
         //扫描实体类包的实体class
-        Set<Class> set = classSet;
-        Map<String, Class> map = new HashMap<>(set.size());
-
-        set.forEach((clazz)->{
-            map.put(BeanSqlUtil.beanNameToTableName(clazz), clazz);
-        });
+        Map<String, Class> map = classSet.stream().collect(Collectors.toMap(BeanSqlUtil::beanNameToTableName,clazz->clazz));
         //初始化的时候,tableList可能为null
-        if(tableList!=null) {
-            tableList.forEach((table)->{
+        if(tableList!=null&&tableList.size()>0) {
+            tableList.forEach(table->{
                 if (map.containsKey(table.getTableName())) {
                     Class clazz = map.get(table.getTableName());
                     List<Field> fieldsList = BeanUtil.getAllField(clazz);
                     Map<String, Object> clazzMap = new HashMap<>(fieldsList.size());
-                    Iterator<Field> fieldsIterator = fieldsList.iterator();
-                    while (fieldsIterator.hasNext()) {
-                        Field f = fieldsIterator.next();
-                        clazzMap.put(BeanSqlUtil.caseToHump(f.getName()), f);
-                    }
-                    List<Column> columnList = table.getColumns();
+                    fieldsList.forEach(field -> {
+                        clazzMap.put(BeanSqlUtil.caseToHump(field.getName()), field);
+                    });
 
+                    List<Column> columnList = table.getColumns();
                     Iterator<Column> columnIterator = columnList.iterator();
                     while (columnIterator.hasNext()) {
                         Column column = columnIterator.next();
@@ -64,13 +58,11 @@ public class MysqlBuilder extends AbstractDbBuiler {
                         }
 
                     }
-                    columnIterator = columnList.iterator();
-                    while (columnIterator.hasNext()) {
-                        Column column = columnIterator.next();
+                    columnList.forEach(column -> {
                         sql.append("ALTER TABLE " + table.getTableName() + " DROP COLUMN " + column.getColumnName() + ";");
-                    }
-
-                    for (String key : clazzMap.keySet()) {
+                    });
+                    Set<String> keySet = clazzMap.keySet();
+                    keySet.forEach(key->{
                         Field f = (Field) clazzMap.get(key);
                         String column = BeanSqlUtil.caseToHump(f.getName());
                         String columnType = dataTypeMap.get(f.getGenericType().toString());
@@ -79,7 +71,8 @@ public class MysqlBuilder extends AbstractDbBuiler {
                             lengthStr = "(100)";
                         }
                         sql.append("ALTER TABLE " + table.getTableName() + " ADD COLUMN " + column + " " + columnType + lengthStr + ";");
-                    }
+
+                    });
                     map.remove(table.getTableName());
                 }
             });