diff --git a/panda-jdbc/src/main/java/org/panda/jdbc/sql/builder/MysqlBuilder.java b/panda-jdbc/src/main/java/org/panda/jdbc/sql/builder/MysqlBuilder.java
index 0fdbe96..5d93617 100644
--- a/panda-jdbc/src/main/java/org/panda/jdbc/sql/builder/MysqlBuilder.java
+++ b/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
@@ -21,6 +22,14 @@ public class MysqlBuilder extends AbstractDbBuiler {
     private static final Logger LOGGER = LoggerFactory.getLogger(MysqlBuilder.class);
 
     private static Map<String,String> dataTypeMap=new HashMap<>();
+    /**
+     * 数据库数据类型-char
+     */
+    public static final String DB_TYPE_CHAR = "char";
+    /**
+     * 数据库数据类型-int
+     */
+    public static final String DB_TYPE_INT = "int";
 
     static {
         dataTypeMap.put("class java.lang.String","varchar");
@@ -35,26 +44,19 @@ 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();
@@ -62,24 +64,22 @@ public class MysqlBuilder extends AbstractDbBuiler {
                             clazzMap.remove(column.getColumnName());
                             columnIterator.remove();
                         }
-
                     }
-                    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());
                         String lengthStr = "";
-                        if ("varchar".equals(columnType) || "int".equals(columnType)) {
+                        if (DB_TYPE_CHAR.equals(columnType) || DB_TYPE_CHAR.equals(columnType)) {
                             lengthStr = "(100)";
                         }
                         sql.append("ALTER TABLE " + table.getTableName() + " ADD COLUMN " + column + " " + columnType + lengthStr + ";");
-                    }
+
+                    });
                     map.remove(table.getTableName());
                 }
             });
@@ -111,7 +111,7 @@ public class MysqlBuilder extends AbstractDbBuiler {
         for (Map<String,String> map:mapList){
             String dataTypeStr = dataTypeMap.get(map.get("fieldType"));
             sql.append(BeanSqlUtil.caseToHump(map.get("fieldName"))+" "+dataTypeStr);
-            if ("varchar".equals(dataTypeStr)||"int".equals(dataTypeStr)){
+            if (DB_TYPE_CHAR.equals(dataTypeStr)||DB_TYPE_INT.equals(dataTypeStr)){
                 if (map.containsKey("fieldLength")) {
                     sql.append("("+map.get("fieldLength")+")");
                 }