Merge pull request #14693 from taosdata/docs/TD-17177

docs: add col length of example

docs/en/14-reference/03-connector/java.mdx

@@ -91,7 +91,7 @@ Add following dependency in the `pom.xml` file of your Maven project:
 You can build Java connector from source code after cloning the TDengine project:
 
 ```
-git clone https://github.com/taosdata/taos-connector-jdbc.git
+git clone https://github.com/taosdata/taos-connector-jdbc.git --branch 2.0
 cd taos-connector-jdbc
 mvn clean install -Dmaven.test.skip=true
 ```
@@ -140,34 +140,34 @@ When you use a JDBC native connection to connect to a TDengine cluster, you can
 
 1. Do not specify hostname and port in Java applications.
 
-    ```java
-    public Connection getConn() throws Exception{
-    Class.forName("com.taosdata.jdbc.TSDBDriver");
-    String jdbcUrl = "jdbc:TAOS://:/test?user=root&password=taosdata";
-    Properties connProps = new Properties();
-    connProps.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
-    connProps.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
-    connProps.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
-    Connection conn = DriverManager.getConnection(jdbcUrl, connProps);
-    return conn;
-    }
-    ```
+   ```java
+   public Connection getConn() throws Exception{
+   Class.forName("com.taosdata.jdbc.TSDBDriver");
+   String jdbcUrl = "jdbc:TAOS://:/test?user=root&password=taosdata";
+   Properties connProps = new Properties();
+   connProps.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+   connProps.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+   connProps.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+   Connection conn = DriverManager.getConnection(jdbcUrl, connProps);
+   return conn;
+   }
+   ```
 
 2. specify the firstEp and the secondEp in the configuration file taos.cfg
 
-    ```shell
-    # first fully qualified domain name (FQDN) for TDengine system
-    firstEp               cluster_node1:6030
+   ```shell
+   # first fully qualified domain name (FQDN) for TDengine system
+   firstEp               cluster_node1:6030
 
-    # second fully qualified domain name (FQDN) for TDengine system, for cluster only
-    secondEp              cluster_node2:6030
+   # second fully qualified domain name (FQDN) for TDengine system, for cluster only
+   secondEp              cluster_node2:6030
 
-    # default system charset
-    # charset               UTF-8
+   # default system charset
+   # charset               UTF-8
 
-    # system locale
-    # locale                en_US.UTF-8
-    ```
+   # system locale
+   # locale                en_US.UTF-8
+   ```
 
 In the above example, JDBC uses the client's configuration file to establish a connection to a hostname `cluster_node1`, port 6030, and a database named `test`. When the firstEp node in the cluster fails, JDBC attempts to connect to the cluster using secondEp.
 

docs/zh/14-reference/03-connector/java.mdx

@@ -93,7 +93,7 @@ Maven 项目中，在 pom.xml 中添加以下依赖：
 可以通过下载 TDengine 的源码，自己编译最新版本的 Java connector
 
 ```shell
-git clone https://github.com/taosdata/taos-connector-jdbc.git
+git clone https://github.com/taosdata/taos-connector-jdbc.git --branch 2.0
 cd taos-connector-jdbc
 mvn clean install -Dmaven.test.skip=true
 ```
@@ -368,7 +368,7 @@ public class ParameterBindingDemo {
 
     private static final String host = "127.0.0.1";
     private static final Random random = new Random(System.currentTimeMillis());
-    private static final int BINARY_COLUMN_SIZE = 20;
+    private static final int BINARY_COLUMN_SIZE = 30;
     private static final String[] schemaList = {
             "create table stable1(ts timestamp, f1 tinyint, f2 smallint, f3 int, f4 bigint) tags(t1 tinyint, t2 smallint, t3 int, t4 bigint)",
             "create table stable2(ts timestamp, f1 float, f2 double) tags(t1 float, t2 double)",