【优化】将 Jdbc 的 SQL 构建放在 JdbcSql 中，后续可添加 SQL 的其它子类，用于构建 MyBatis 等不同的 SQL。

2023-06-07 11:51:32 +08:00
parent 6164c1650b
commit 58e085277b
3 changed files with 70 additions and 61 deletions
--- a/src/main/java/xyz/zhouxy/plusone/commons/jdbc/JdbcSql.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/jdbc/JdbcSql.java
@@ -0,0 +1,62 @@
+package xyz.zhouxy.plusone.commons.jdbc;
+
+import java.util.Collection;
+
+public class JdbcSql extends SQL<JdbcSql> {
+
+    JdbcSql() {
+        super();
+    }
+
+    @Override
+    public JdbcSql getSelf() {
+        return this;
+    }
+
+    public static String IN(String col, Collection<?> c) {
+        return IN(col, c.size());
+    }
+
+    public static <T> String IN(String col, T[] c) {
+        return IN(col, c.length);
+    }
+
+    private static String IN(String col, int length) {
+        return new StringBuilder()
+                .append(col)
+                .append(" IN (")
+                .append(buildQuestionsList(length))
+                .append(')')
+                .toString();
+    }
+
+    public static String NOT_IN(String col, Collection<?> c) {
+        return NOT_IN(col, c.size());
+    }
+
+    public static <T> String NOT_IN(String col, T[] c) {
+        return NOT_IN(col, c.length);
+    }
+
+    private static String NOT_IN(String col, int length) {
+        return new StringBuilder()
+                .append(col)
+                .append(" NOT IN (")
+                .append(buildQuestionsList(length))
+                .append(')')
+                .toString();
+    }
+
+    private static char[] buildQuestionsList(int times) {
+        char[] arr = new char[times * 3 - 2];
+        int i = 0;
+        for (int t = 1; t <= times; t++) {
+            arr[i++] = '?';
+            if (t < times) {
+                arr[i++] = ',';
+                arr[i++] = ' ';
+            }
+        }
+        return arr;
+    }
+}