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Update docs.md

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Zhiyu Yang 2021-08-23 16:38:11 +08:00 committed by GitHub
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documentation20/en/08.connector/01.java/docs.md
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@ -317,14 +317,17 @@ Since version 2.1.2.0, TDengine's JDBC-JNI implementation has significantly impr
Statement stmt = conn.createStatement(); Statement stmt = conn.createStatement();
Random r = new Random(); Random r = new Random();
// In the INSERT statement, the VALUES clause allows you to specify a specific column; If automatic table creation is adopted, the TAGS clause needs to set the parameter values of all TAGS columns
TSDBPreparedStatement s = (TSDBPreparedStatement) conn.prepareStatement("insert into ? using weather_test tags (?, ?) (ts, c1, c2) values(?, ?, ?)"); TSDBPreparedStatement s = (TSDBPreparedStatement) conn.prepareStatement("insert into ? using weather_test tags (?, ?) (ts, c1, c2) values(?, ?, ?)");
s.setTableName("w1"); s.setTableName("w1");
// set tags
s.setTagInt(0, r.nextInt(10)); s.setTagInt(0, r.nextInt(10));
s.setTagString(1, "Beijing"); s.setTagString(1, "Beijing");
int numOfRows = 10; int numOfRows = 10;
// set values
ArrayList<Long> ts = new ArrayList<>(); ArrayList<Long> ts = new ArrayList<>();
for (int i = 0; i < numOfRows; i++){ for (int i = 0; i < numOfRows; i++){
ts.add(System.currentTimeMillis() + i); ts.add(System.currentTimeMillis() + i);
@ -341,9 +344,10 @@ for (int i = 0; i < numOfRows; i++){
} }
s.setString(2, s2, 10); s.setString(2, s2, 10);
// The cache is not cleared after AddBatch. Do not bind new data again before ExecuteBatch
s.columnDataAddBatch(); s.columnDataAddBatch();
s.columnDataExecuteBatch(); s.columnDataExecuteBatch();
// Clear the cache, after which you can bind new data(including table names, tags, values):
s.columnDataClearBatch(); s.columnDataClearBatch();
s.columnDataCloseBatch(); s.columnDataCloseBatch();
``` ```
@ -499,6 +503,10 @@ Query OK, 1 row(s) in set (0.000141s)
- Please refer to [SpringJdbcTemplate](https://github.com/taosdata/TDengine/tree/develop/tests/examples/JDBC/SpringJdbcTemplate) if using taos-jdbcdriver in Spring JdbcTemplate. - Please refer to [SpringJdbcTemplate](https://github.com/taosdata/TDengine/tree/develop/tests/examples/JDBC/SpringJdbcTemplate) if using taos-jdbcdriver in Spring JdbcTemplate.
- Please refer to [springbootdemo](https://github.com/taosdata/TDengine/tree/develop/tests/examples/JDBC/springbootdemo) if using taos-jdbcdriver in Spring JdbcTemplate. - Please refer to [springbootdemo](https://github.com/taosdata/TDengine/tree/develop/tests/examples/JDBC/springbootdemo) if using taos-jdbcdriver in Spring JdbcTemplate.
## Example Codes
you see sample code here: ![JDBC example](https://github.com/taosdata/TDengine/tree/develop/tests/examples/JDBC)
## FAQ ## FAQ
- java.lang.UnsatisfiedLinkError: no taos in java.library.path - java.lang.UnsatisfiedLinkError: no taos in java.library.path