最新代码

play-admin/src/main/java/com/starry/admin/common/conf/ListTypeHandler.java

@@ -0,0 +1,54 @@
+package com.starry.admin.common.conf;
+
+import com.alibaba.fastjson2.JSON;
+import com.alibaba.fastjson2.TypeReference;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.ibatis.type.BaseTypeHandler;
+import org.apache.ibatis.type.JdbcType;
+import org.apache.ibatis.type.MappedJdbcTypes;
+import org.apache.ibatis.type.MappedTypes;
+import org.springframework.util.StringUtils;
+
+import java.sql.CallableStatement;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+@Slf4j
+@MappedJdbcTypes(JdbcType.VARCHAR)  //数据库类型
+@MappedTypes({List.class})          //java数据类型
+public abstract class ListTypeHandler<T> extends BaseTypeHandler<List<T>> {
+    @Override
+    public void setNonNullParameter(PreparedStatement ps, int i, List<T> parameter, JdbcType jdbcType) throws SQLException {
+        String content = StringUtils.isEmpty(parameter) ? null : JSON.toJSONString(parameter);
+        ps.setString(i, content);
+    }
+
+    @Override
+    public List<T> getNullableResult(ResultSet rs, String columnName) throws SQLException {
+        return this.getListByJsonArrayString(rs.getString(columnName));
+    }
+
+    @Override
+    public List<T> getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
+        return this.getListByJsonArrayString(rs.getString(columnIndex));
+    }
+
+    @Override
+    public List<T> getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
+        return this.getListByJsonArrayString(cs.getString(columnIndex));
+    }
+
+    private List<T> getListByJsonArrayString(String content) {
+        return StringUtils.isEmpty(content) ? new ArrayList<>() : JSON.parseObject(content, this.specificType());
+    }
+
+    /**
+     * 具体类型，由子类提供
+     *
+     * @return 具体类型
+     */
+    protected abstract TypeReference<List<T>> specificType();
+}

play-admin/src/main/java/com/starry/admin/common/conf/StringTypeHandler.java

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+package com.starry.admin.common.conf;
+
+import com.alibaba.fastjson2.TypeReference;
+import java.util.List;
+
+public class StringTypeHandler extends ListTypeHandler<String> {
+    // 将ListTypeHandler<T>（T为任意对象），具体为特定的对象String
+    @Override
+    protected TypeReference<List<String>> specificType() {
+        return new TypeReference<List<String>>() {
+        };
+    }
+}