test(mybatis-plus-core):添加lambda表达式下的条件构造基础测试 https://gitee.com/baomidou/mybatis-plus/issues/IIB86

mybatis-plus-core/build.gradle

@@ -6,6 +6,7 @@ dependencies {
     compile project(":mybatis-plus-annotation")
     compile rootProject.ext.dependencies["mybatis"]
     compile rootProject.ext.dependencies["jsqlparser"]
+    compile group: 'com.trigersoft', name: 'jaque', version: '2.1.2'
 
     testCompile rootProject.ext.dependencies["mybatis-ehcache"]
     testCompile rootProject.ext.dependencies["logback-classic"]

mybatis-plus-core/src/test/java/com/baomidou/mybatisplus/core/test/Main.java

@@ -0,0 +1,12 @@
+package com.baomidou.mybatisplus.core.test;
+
+public class Main {
+    public static void main(String[] args) {
+        Query query = new Query(User.class)
+            .select(User::getId, User::getName)
+            .eq(User::getId, 1)
+            .eq(User::getName,"张三")
+            .orderBy(User::getName);
+        System.out.println(query);
+    }
+}

mybatis-plus-core/src/test/java/com/baomidou/mybatisplus/core/test/Query.java

@@ -0,0 +1,58 @@
+package com.baomidou.mybatisplus.core.test;
+
+import static com.baomidou.mybatisplus.core.test.QueryHelper.method;
+
+import java.io.Serializable;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import org.apache.ibatis.jdbc.SQL;
+
+public class Query {
+
+    private SQL sql = new SQL();
+
+    private Class<?> clazz;
+
+    private Map<Method,String> introspector;
+
+    public Query(Class<?> clazz) {
+        this.clazz = clazz;
+        introspector=QueryHelper.introspector(clazz);
+        sql.FROM(clazz.getSimpleName().toUpperCase());
+    }
+
+    public Query select(){
+        sql.SELECT("*");
+        return this;
+    }
+    public <T>  Query select(Property<T, ?>... fun){
+       String[] args = Arrays.asList(fun).stream().map(x -> introspector.get( method(x))).collect(Collectors.toList()).toArray(new String[]{});
+        sql.SELECT(args);
+        return this;
+    }
+
+    public <T> Query eq(Property<T, ?> fun,Object param) {
+        String name = introspector.get( method(fun));
+        sql.WHERE(name+"="+param);
+        return this;
+    }
+
+    public <T> Query orderBy(Property<T, ?> fun) {
+        String name = introspector.get( method(fun));
+        sql.ORDER_BY(name);
+        return this;
+    }
+
+    @Override
+    public String toString() {
+        return sql.toString();
+    }
+
+    public interface Property<T, R> extends Function<T, R>, Serializable {
+    }
+
+}

mybatis-plus-core/src/test/java/com/baomidou/mybatisplus/core/test/QueryHelper.java

@@ -0,0 +1,54 @@
+package com.baomidou.mybatisplus.core.test;
+
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.core.test.Query.Property;
+import com.trigersoft.jaque.expression.Expression;
+import com.trigersoft.jaque.expression.InvocationExpression;
+import com.trigersoft.jaque.expression.LambdaExpression;
+import com.trigersoft.jaque.expression.MemberExpression;
+import java.beans.BeanInfo;
+import java.beans.IntrospectionException;
+import java.beans.Introspector;
+import java.beans.PropertyDescriptor;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public class QueryHelper {
+
+    public static <T> Method method(Property<T, ?> fun) {
+        LambdaExpression parsed = LambdaExpression.parse(fun);
+        Expression body = parsed.getBody();
+        return (Method) ((MemberExpression) ((InvocationExpression) body).getTarget()).getMember();
+    }
+
+    public static Map<Method,String> introspector(Class clazz) {
+        Map<Method,String>  map = new LinkedHashMap<>();
+        BeanInfo beanInfo = null;
+        try {
+            beanInfo = Introspector.getBeanInfo(clazz, Object.class);
+        } catch (IntrospectionException e) {
+            e.printStackTrace();
+        }
+        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
+        for (Field field : clazz.getDeclaredFields()) {
+            for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
+                if (propertyDescriptor.getName().equals(field.getName())) {
+                    TableField tableField = field.getDeclaredAnnotation(TableField.class);
+                    if(tableField==null){
+                    map.put(propertyDescriptor.getReadMethod(),field.getName());
+                    }else {
+                        String value = tableField.value();
+                        if(value==null||value.isEmpty()){
+                            map.put(propertyDescriptor.getReadMethod(),field.getName());
+                        }else{
+                        map.put(propertyDescriptor.getReadMethod(), value);
+                        }
+                    }
+                }
+            }
+        }
+        return map;
+    }
+}

mybatis-plus-core/src/test/java/com/baomidou/mybatisplus/core/test/Role.java

@@ -0,0 +1,12 @@
+package com.baomidou.mybatisplus.core.test;
+
+import com.baomidou.mybatisplus.annotation.TableField;
+import lombok.Data;
+
+@Data
+public class Role {
+    private Integer id;
+
+    @TableField("roleName")
+    private String name;
+}

mybatis-plus-core/src/test/java/com/baomidou/mybatisplus/core/test/User.java

@@ -0,0 +1,18 @@
+package com.baomidou.mybatisplus.core.test;
+
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+@TableName("sys_user")
+@Data
+public class User {
+
+    private Integer id;
+
+    @TableField("username")
+    private String name;
+
+    private Integer roleId;
+
+}